--- jsr166/build.xml	2017/03/24 15:57:26	1.237
+++ jsr166/build.xml	2022/11/25 20:33:50	1.327
@@ -1,5 +1,6 @@
 <project name="jsr166" default="usage"
-  xmlns:if="ant:if" xmlns:unless="ant:unless"
+  xmlns:if="ant:if"
+  xmlns:unless="ant:unless"
   xmlns:ivy="antlib:org.apache.ivy.ant">
 
   <description>
@@ -18,23 +19,20 @@
   itself.  Because the JDK version matters and because different
   targets require different JDKs, we assume that users have created a
   hierarchy containing:
-  $HOME/jdk/jdk7
-  $HOME/jdk/jdk8
-  $HOME/jdk/jdk9
-  $HOME/jdk/jdk10
+  $HOME/jdk/jdk17
+  $HOME/jdk/jdk19
   where each of the above is a JDK or a symlink to same, and
-  $HOME/jdk/src/jdk7
-  $HOME/jdk/src/jdk8
-  $HOME/jdk/src/jdk9
-  $HOME/jdk/src/jdk10
-  where each of the above is a complete JDK source tree
-  (e.g. mercurial forest) or a symlink to same.
+  $HOME/jdk/src/jdk17
+  where each of the above is a JDK source tree or a symlink to same.
 
   Alternatively, define ant variables thus:
   ant -Djdk$N.home=... -Djdk$N.src.home=...
-  for $N in 7 8 9 10 ...
+  for $N in 17 .. 19 ...
 
   As of 2016-03, the sources in src/main are for jdk9+ only.
+  As of 2019-08, the sources in src/main are for jdk11+ only.
+  As of 2019-10, compatibility support for jdk8 is dropped entirely.
+  As of 2022-02, the sources in src/main are for jdk17+ only.
 ------------------------------------------------------------------------------
   </description>
 
@@ -52,7 +50,6 @@
 
 
   <!-- Compilation options -->
-  <property name="build.sourcelevel"    value="6"/>
   <property name="build.debug"          value="true"/>
   <property name="build.debuglevel"     value="source,lines,vars"/>
   <property name="build.deprecation"    value="false"/>
@@ -64,26 +61,6 @@
   <property name="build.testcases.dir"         location="${build.dir}/testcases"/>
   <property name="build.loops.dir"             location="${build.dir}/loops"/>
 
-  <property name="build.4jdk7.dir"             location="${build.dir}/jsr166-4jdk7"/>
-  <property name="build.4jdk7.classes.dir"     location="${build.4jdk7.dir}/classes"/>
-  <property name="build.4jdk7.tck.classes.dir" location="${build.4jdk7.dir}/tck-classes"/>
-  <property name="build.4jdk7.docs.dir"        location="${build.4jdk7.dir}/docs"/>
-
-  <property name="build.4jdk8.dir"             location="${build.dir}/jsr166-4jdk8"/>
-  <property name="build.4jdk8.classes.dir"     location="${build.4jdk8.dir}/classes"/>
-  <property name="build.4jdk8.tck.classes.dir" location="${build.4jdk8.dir}/tck-classes"/>
-  <property name="build.4jdk8.docs.dir"        location="${build.4jdk8.dir}/docs"/>
-
-  <property name="build.jsr166x.dir"           location="${build.dir}/jsr166x"/>
-  <property name="build.jsr166y.dir"           location="${build.dir}/jsr166y"/>
-  <property name="build.jsr166e.dir"           location="${build.dir}/jsr166e"/>
-  <property name="build.extra166y.dir"         location="${build.dir}/extra166y"/>
-
-  <property name="build.jsr166x.classes.dir"   location="${build.jsr166x.dir}/classes"/>
-  <property name="build.jsr166y.classes.dir"   location="${build.jsr166y.dir}/classes"/>
-  <property name="build.jsr166e.classes.dir"   location="${build.jsr166e.dir}/classes"/>
-  <property name="build.extra166y.classes.dir" location="${build.extra166y.dir}/classes"/>
-
   <!-- JDK locations -->
   <property name="jdks.home"  location="${user.home}/jdk"/>
 
@@ -95,25 +72,7 @@
     <property name="javac@{v}"        location="${jdk@{v}.home}/bin/javac"/>
     <property name="javadoc@{v}"      location="${jdk@{v}.home}/bin/javadoc"/>
     <property name="jdk@{v}.src.home" location="${jdks.home}/src/jdk@{v}"/>
-    <local name="have.java.base"/>
-    <available property="have.java.base"
-      file="${jdk@{v}.src.home}/jdk/src/java.base/share/classes" type="dir"/>
-    <property name="jdk@{v}.src.dir" location="${jdk@{v}.src.home}/jdk/src/java.base/share/classes"
-      if:set="have.java.base"/>
-    <property name="jdk@{v}.src.dir" location="${jdk@{v}.src.home}/jdk/src/share/classes"
-      unless:set="have.java.base"/>
-    <local name="modules"/>
-    <available property="modules" file="${jdk@{v}.home}/jmods" type="dir"/>
-    <local name="boot.jar.dir"/>
-    <property name="boot.jar.dir"   location="${jdk@{v}.home}/jre/lib" unless:set="modules"/>
-    <path id="bootclasspath@{v}" unless:set="modules">
-      <pathelement path="${boot.jar.dir}/resources.jar"/>
-      <pathelement path="${boot.jar.dir}/rt.jar"/>
-      <pathelement path="${boot.jar.dir}/jsse.jar"/>
-      <pathelement path="${boot.jar.dir}/jce.jar"/>
-      <pathelement path="${boot.jar.dir}/charsets.jar"/>
-    </path>
-    <property name="bootclasspath@{v}" value="${toString:bootclasspath@{v}}" unless:set="modules"/>
+    <property name="jdk@{v}.src.dir"  location="${jdk@{v}.src.home}/jdk/src/java.base/share/classes"/>
     </sequential>
   </macrodef>
 
@@ -129,76 +88,47 @@
     </sequential>
   </macrodef>
 
-  <defjdklocations v="6"/>
-  <defjdklocations v="7"/>
-  <defjdklocations v="8"/>
-  <defjdklocations v="9"/>
-  <defjdklocations v="10"/>
+  <defjdklocations v="17"/>
+  <defjdklocations v="18"/>
+  <defjdklocations v="19"/>
+  <defjdklocations v="20"/>
 
   <!-- Source locations -->
   <property name="src.dir"              location="${basedir}/src/main"/>
   <property name="test.src.dir"         location="${basedir}/src/test"/>
   <property name="loops.src.dir"        location="${basedir}/src/loops"/>
   <property name="tck.src.dir"          location="${test.src.dir}/tck"/>
-  <property name="jtreg7.src.dir"       location="${test.src.dir}/jtreg-jdk7"/>
-  <property name="jtreg8.src.dir"       location="${test.src.dir}/jtreg-jdk8"/>
-  <property name="jtreg9.src.dir"       location="${test.src.dir}/jtreg"/>
-  <property name="jtreg10.src.dir"      location="${test.src.dir}/jtreg"/>
-  <property name="jtreg.src.dir"        location="${jtreg9.src.dir}"/>
+  <property name="jtreg17.src.dir"      location="${test.src.dir}/jtreg"/>
+  <property name="jtreg18.src.dir"      location="${test.src.dir}/jtreg"/>
+  <property name="jtreg19.src.dir"      location="${test.src.dir}/jtreg"/>
+  <property name="jtreg20.src.dir"      location="${test.src.dir}/jtreg"/>
+  <property name="jtreg.src.dir"        location="${jtreg17.src.dir}"/>
   <property name="lib.dir"              location="${basedir}/lib"/>
   <property name="dist.dir"             location="${basedir}/dist"/>
   <property name="topsrc.dir"           location="${basedir}/src"/>
-  <property name="4jdk7src.dir"         location="${topsrc.dir}/jdk7"/>
-  <property name="4jdk8src.dir"         location="${topsrc.dir}/jdk8"/>
-  <property name="jsr166xsrc.dir"       location="${topsrc.dir}/jsr166x"/>
-  <property name="jsr166ysrc.dir"       location="${topsrc.dir}/jsr166y"/>
-  <property name="jsr166esrc.dir"       location="${topsrc.dir}/jsr166e"/>
-  <property name="extra166ysrc.dir"     location="${topsrc.dir}/extra166y"/>
 
   <!-- Javadoc locations -->
   <property name="docs.dir"          location="${build.dir}/docs"/>
-  <property name="4jdk7docs.dir"     location="${build.4jdk7.dir}/docs"/>
-  <property name="4jdk8docs.dir"     location="${build.4jdk8.dir}/docs"/>
-  <property name="jsr166xdocs.dir"   location="${build.jsr166x.dir}/docs"/>
-  <property name="jsr166ydocs.dir"   location="${build.jsr166y.dir}/docs"/>
-  <property name="jsr166edocs.dir"   location="${build.jsr166e.dir}/docs"/>
-  <property name="extra166ydocs.dir" location="${build.extra166y.dir}/docs"/>
-
-  <property name="dist.docs.dir"          location="${dist.dir}/docs"/>
-  <property name="dist.4jdk7docs.dir"     location="${dist.dir}/jsr166-4jdk7docs"/>
-  <property name="dist.4jdk8docs.dir"     location="${dist.dir}/jsr166-4jdk8docs"/>
-  <property name="dist.jsr166xdocs.dir"   location="${dist.dir}/jsr166xdocs"/>
-  <property name="dist.jsr166ydocs.dir"   location="${dist.dir}/jsr166ydocs"/>
-  <property name="dist.jsr166edocs.dir"   location="${dist.dir}/jsr166edocs"/>
-  <property name="dist.extra166ydocs.dir" location="${dist.dir}/extra166ydocs"/>
+  <property name="dist.docs.dir"     location="${dist.dir}/docs"/>
 
   <!-- Jar locations -->
   <property name="product.jar"      location="${build.dir}/jsr166.jar"/>
-  <property name="4jdk7product.jar" location="${build.4jdk7.dir}/jsr166-4jdk7.jar"/>
-  <property name="4jdk8product.jar" location="${build.4jdk8.dir}/jsr166-4jdk8.jar"/>
-  <property name="jsr166x.jar"      location="${build.jsr166x.dir}/jsr166x.jar"/>
-  <property name="jsr166y.jar"      location="${build.jsr166y.dir}/jsr166y.jar"/>
-  <property name="jsr166e.jar"      location="${build.jsr166e.dir}/jsr166e.jar"/>
-  <property name="extra166y.jar"    location="${build.extra166y.dir}/extra166y.jar"/>
   <property name="junit.jar"        location="${lib.dir}/junit.jar"/>
 
   <!-- Canonical location of jdk docs root, to use with javadoc -Xdocrootparent flag -->
-  <property name="java5.docroot.url"      value="http://docs.oracle.com/javase/1.5.0/docs"/>
-  <property name="java6.docroot.url"      value="http://docs.oracle.com/javase/6/docs"/>
-  <property name="java7.docroot.url"      value="http://docs.oracle.com/javase/7/docs"/>
-  <property name="java8.docroot.url"      value="http://docs.oracle.com/javase/8/docs"/>
-  <!-- The expected canonical location does not yet exist as of 2016-04 -->
-  <!-- <property name="java9.docroot.url" value="http://docs.oracle.com/javase/9/docs"/> -->
-  <property name="java9.docroot.url"      value="http://download.java.net/java/jdk9/docs"/>
-  <!-- Default jdk doc location (latest stable release seems best) -->
-  <property name="java.docroot.url"       value="${java8.docroot.url}"/>
+  <!-- Switched to https: in 2017-10 - JDK-8190312 -->
+  <property name="java17.docroot.url" value="https://docs.oracle.com/en/java/javase/17/docs"/>
+  <property name="java18.docroot.url" value="https://docs.oracle.com/en/java/javase/18/docs"/>
+  <property name="java19.docroot.url" value="https://docs.oracle.com/en/java/javase/19/docs"/>
+  <property name="java20.docroot.url" value="https://download.java.net/java/early_access/jdk20/docs"/>
+  <!-- Default jdk doc location (latest stable LTS release seems best) -->
+  <property name="java.docroot.url"   value="${java17.docroot.url}"/>
 
   <!-- Canonical location of jdk API docs, to use with javadoc link attribute -->
-  <property name="java5.api.url"      value="${java5.docroot.url}/api/"/>
-  <property name="java6.api.url"      value="${java6.docroot.url}/api/"/>
-  <property name="java7.api.url"      value="${java7.docroot.url}/api/"/>
-  <property name="java8.api.url"      value="${java8.docroot.url}/api/"/>
-  <property name="java9.api.url"      value="${java9.docroot.url}/api/"/>
+  <property name="java17.api.url"     value="${java17.docroot.url}/api/"/>
+  <property name="java18.api.url"     value="${java18.docroot.url}/api/"/>
+  <property name="java19.api.url"     value="${java19.docroot.url}/api/"/>
+  <property name="java20.api.url"     value="${java20.docroot.url}/api/"/>
   <property name="java.api.url"       value="${java.docroot.url}/api/"/>
 
   <!-- Define the "jtreg" task -->
@@ -206,7 +136,7 @@
   <taskdef name="jtreg" classname="com.sun.javatest.regtest.Main$$Ant"
            classpath="${lib.dir}/jtreg.jar" />
 
-  <!-- Tck options; see JSR166TestCase.java
+  <!-- Tck configuration options; see JSR166TestCase.java
    To profile a single tck test class:
    ant -Djsr166.profileTests=true -Djsr166.profileThreshold=10 -Djsr166.tckTestClass=CompletableFutureTest tck
    To stress test a single tck test class:
@@ -229,11 +159,6 @@
 
     <sequential>
 
-    <local name="modules"/>
-    <condition property="modules">
-      <available file="${jdk@{compile-target}.home}/jmods" type="dir"/>
-    </condition>
-
     <mkdir dir="@{workdir}/tck-classes"/>
 
     <javac srcdir="@{tck.src.dir}"
@@ -254,8 +179,7 @@
       <compilerarg value="-XDignore.symbol.file=true"/>
       <compilerarg value="-Xlint:all,-unchecked,-rawtypes,-serial,-deprecation,-try"/>
       <compilerarg value="-Xdoclint:reference/private"/>
-      <compilerarg value="-Xbootclasspath/p:@{classes}" unless:set="modules"/>
-      <compilerarg value="--patch-module=java.base=@{classes}" if:set="modules"/>
+      <compilerarg value="--patch-module=java.base=@{classes}"/>
       <compilerarg line="${build.args}"/>
       <javac-elements/>
 
@@ -265,89 +189,93 @@
           failonerror="true"
           jvm="${java@{target}}"
           fork="true">
-	<jvmarg value="-Xbootclasspath/p:@{classes}" unless:set="modules"/>
-	<jvmarg value="--patch-module=java.base=@{classes}" if:set="modules"/>
-	<jvmarg value="--add-opens=java.base/java.lang=ALL-UNNAMED" if:set="modules"/>
-	<jvmarg value="--add-opens=java.base/java.util=ALL-UNNAMED" if:set="modules"/>
-	<jvmarg value="--add-opens=java.base/java.util.concurrent=ALL-UNNAMED" if:set="modules"/>
-	<jvmarg value="--add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED" if:set="modules"/>
-	<jvmarg value="--add-opens=java.base/java.util.concurrent.locks=ALL-UNNAMED" if:set="modules"/>
-	<jvmarg line="@{jvmflags}"/>
-	<!-- ant -Dvmoptions="-Xmx8m" -Djsr166.tckTestClass=CompletableFutureTest tck -->
-	<jvmarg line="${vmoptions}" if:set="vmoptions"/>
-
-	<!-- ant -Djava.util.concurrent.ForkJoinPool.common.parallelism=1 tck -->
-	<syspropertyset id="system-properties-used-by-tck">
-	  <propertyref prefix="java.util.concurrent.ForkJoinPool"/>
-	  <propertyref prefix="jsr166."/>
-	  <propertyref name="test.timeout.factor"/>
-	</syspropertyset>
-
-	<classpath>
-	  <pathelement location="${junit.jar}"/>
-	  <pathelement location="@{workdir}/tck-classes"/>
-	</classpath>
+        <jvmarg value="--patch-module=java.base=@{classes}"/>
+        <jvmarg value="--add-opens=java.base/java.lang=ALL-UNNAMED"/>
+        <jvmarg value="--add-opens=java.base/java.util=ALL-UNNAMED"/>
+        <jvmarg value="--add-opens=java.base/java.util.concurrent=ALL-UNNAMED"/>
+        <jvmarg value="--add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED"/>
+        <jvmarg value="--add-opens=java.base/java.util.concurrent.locks=ALL-UNNAMED"/>
+        <jvmarg line="@{jvmflags}"/>
+        <!-- ant -Dvmoptions="-Xmx8m" -Djsr166.tckTestClass=CompletableFutureTest tck -->
+        <jvmarg line="${vmoptions}" if:set="vmoptions"/>
+
+        <!-- ant -Djava.util.concurrent.ForkJoinPool.common.parallelism=1 tck -->
+        <syspropertyset id="system-properties-used-by-tck">
+          <propertyref prefix="java.util.concurrent.ForkJoinPool"/>
+          <propertyref prefix="jsr166."/>
+          <propertyref name="test.timeout.factor"/>
+        </syspropertyset>
+
+        <classpath>
+          <pathelement location="${junit.jar}"/>
+          <pathelement location="@{workdir}/tck-classes"/>
+        </classpath>
     </java>
 
     </sequential>
   </macrodef>
 
   <!-- Define jtreg test sets for different jdk versions -->
-  <fileset dir="${jtreg9.src.dir}">
-    <patternset id="jdk9.jtreg.tests">
-      <include name="**/*.java"/>
-    </patternset>
-  </fileset>
-
-  <fileset dir="${jtreg8.src.dir}">
-    <patternset id="jdk8.jtreg.tests">
-      <include name="**/*.java"/>
-    </patternset>
-  </fileset>
+  <!-- ant -Djtreg.test.pattern="**/ConcurrentHashMap/" -->
+  <!-- ant -Djtreg.test.pattern="**/ToArray.java" -->
+  <property name="jtreg.test.pattern" value="**/*.java"/>
+  <macrodef name="defjtregtests">
+    <attribute name="v"/>
+    <sequential>
+      <fileset dir="${jtreg@{v}.src.dir}">
+        <patternset id="jdk@{v}.jtreg.tests">
+          <include name="${jtreg.test.pattern}"/>
+        </patternset>
+      </fileset>
+    </sequential>
+  </macrodef>
 
-  <fileset dir="${jtreg7.src.dir}">
-    <patternset id="jdk7.jtreg.tests">
-      <include name="**/*.java"/>
-    </patternset>
-  </fileset>
+  <defjtregtests v="17"/>
+  <defjtregtests v="18"/>
+  <defjtregtests v="19"/>
+  <defjtregtests v="20"/>
 
   <!-- ant -Djtreg.flags=-timeoutFactor:4 -->
   <property name="jtreg.flags" value=""/>
 
   <macrodef name="run-jtreg-tests">
-    <!-- ant -Djtreg9.src.dir=src/test/jtreg/util/concurrent/CompletableFuture jtreg -->
-    <attribute name="source" default="7"/>
     <attribute name="target"/>
     <attribute name="workdir"/>
     <attribute name="classes"/>
+    <attribute name="verbose" default="${jtreg.verbose}"/>
     <attribute name="jtregflags" default=""/>
+    <element name="jtreg-elements" optional="true"/>
 
     <sequential>
 
     <!-- ant -Djtreg.verbose=time,fail,error jtreg -->
     <property name="jtreg.verbose" value="nopass,fail,error"/>
 
-    <local name="modules"/>
-    <condition property="modules">
-      <available file="${jdk@{target}.home}/jmods" type="dir"/>
-    </condition>
+    <!-- concurrency > 1 mitigates slowness of some jtreg tests -->
+    <!-- BUT concurrency:auto starts "too many" VMs; just 1 free core each -->
+    <!-- In 2020 concurrency:3 seems like a sweet spot -->
+    <!-- Override using:  ant -Djtreg.concurrency="N" jtreg -->
+    <property name="jtreg.concurrency" value="3"/>
 
-    <delete dir="@{workdir}/JTwork"   quiet="true"/>
+    <delete dir="@{workdir}/JTwork" quiet="true"/>
     <jtreg dir="${jtreg@{target}.src.dir}"
            jdk="${jdk@{target}.home}"
            workDir="@{workdir}/JTwork">
       <patternset refid="jdk@{target}.jtreg.tests"/>
-      <arg value="-Xbootclasspath/p:@{classes}" unless:set="modules"/>
-      <arg value="-javacoptions:--patch-module java.base=@{classes}" if:set="modules"/>
-      <arg value="-vmoptions:--patch-module java.base=@{classes}" if:set="modules"/>
+      <arg value="-javacoption:--patch-module=java.base=@{classes}"/>
+      <arg value="-vmoption:--patch-module=java.base=@{classes}"/>
+      <arg value="-vmoption:-Xmx256m"/>
+      <arg value="-concurrency:${jtreg.concurrency}"/>
+      <arg value="-vmoptions:-esa -ea"/>
+      <arg value="-vmoptions:${vmoptions}" if:set="vmoptions"/>
       <arg value="-agentvm"/>
       <arg value="-noreport"/>
-      <arg value="-verbose:${jtreg.verbose}"/>
-      <arg value="-vmoptions:-esa -ea"/>
+      <arg value="-verbose:@{verbose}"/>
       <arg value="-automatic"/>
       <arg value="-k:!ignore"/>
       <arg line="@{jtregflags}"/>
       <arg line="${jtreg.flags}"/>
+      <jtreg-elements/>
     </jtreg>
     </sequential>
   </macrodef>
@@ -358,33 +286,30 @@
   </path>
 
   <!-- Support @jls tag, used in jdk8+ javadoc -->
+  <!-- TODO: switch to @jls taglet, as supported by jdk14+ javadoc -->
   <property name="javadoc.jls.cite" value="The Java&amp;trade; Language Specification"/>
   <property name="javadoc.jls.option" value="jls:a:See &lt;cite&gt;${javadoc.jls.cite}&lt;/cite&gt;:"/>
 
   <!-- Main targets -->
 
-  <property name="build.main.java.version" value="9"/>
-  <property name="build.main.javac" value="${javac9}"/>
+  <!-- Default values: may seem strange ... -->
+  <!-- At runtime, target latest, but build for current LTS -->
+  <property name="java.runtime.target" value="19"/>
+  <property name="build.main.java" value="${java17}"/>
+  <property name="build.main.javac" value="${javac17}"/>
+  <property name="build.main.javadoc" value="${javadoc19}"/>
+  <property name="build.main.javadoc.source" value="${java.runtime.target}"/>
 
   <target name="dists"
-          depends="dist, 4jdk8dist, 4jdk7dist, jsr166edist, jsr166ydist, extra166ydist, jsr166xdist"
+          depends="dist"
           description="Builds all public jars and docs"/>
 
   <target name="compile"
           depends="configure-compiler"
           description="Compiles src/main sources to build dir">
 
-    <local name="modules"/>
-    <condition property="modules">
-      <and>
-        <available file="${jdk9.home}/jmods" type="dir"/>
-        <equals arg1="9" arg2="${build.main.java.version}"/>
-      </and>
-    </condition>
-
     <local name="destdir"/>
-    <property name="destdir" value="${build.classes.dir}/java.base" if:set="modules"/>
-    <property name="destdir" value="${build.classes.dir}" unless:set="modules"/>
+    <property name="destdir" value="${build.classes.dir}/java.base"/>
 
     <mkdir dir="${destdir}"/>
 
@@ -401,19 +326,18 @@
            fork="true">
 
       <include name="**/*.java"/>
-      <compilerarg value="--patch-module=java.base=${src.dir}" if:set="modules"/>
+      <compilerarg value="--patch-module=java.base=${src.dir}"/>
       <compilerarg value="-Xprefer:source"/>
       <compilerarg value="-XDignore.symbol.file=true"/>
       <compilerarg value="-Xlint:all"/>
+      <compilerarg value="-Xdoclint:all/protected"/>
+      <compilerarg value="-Xdoclint/package:java.util.*"/>
       <compilerarg value="-Werror"/>
-      <compilerarg value="-Xdoclint:all/protected,reference/private"/>
       <compilerarg line="-Xmaxerrs 1000 -Xmaxwarns 1000"/>
       <compilerarg line="${build.args}"/>
-
     </javac>
   </target>
 
-
   <target name="jar"
           depends="compile"
           description="Builds library jar for src/main from compiled sources">
@@ -431,95 +355,52 @@
 
   <target name="docs"
           description="Builds javadocs for src/main to dist dir">
-
-    <delete dir="${docs.dir}"/>
+    <delete dir="${docs.dir}" quiet="true"/>
     <mkdir dir="${docs.dir}"/>
-
-    <!-- the packagenames="none" hack below prevents scanning the -->
-    <!-- sourcepath for packages -->
-
-<!-- TODO: sourcepath="${src.dir}:${jdk9.src.dir}" -->
-<!-- TODO: sourcepath="${src.dir}:${jdk9.src.dir}:${jdk9.src.home}/jdk/src/java.logging/share/classes" -->
-<!-- TODO: sourcepath="${src.dir}:${jdk9.home}/src.zip" -->
-<!-- TODO: <arg line="-sourcepath ${src.dir}:${jdk9.home}/src.zip"/> -->
-<!-- TODO: <arg line="- -module-source-path ${jdk9.home}/src.zip"/> -->
     <javadoc destdir="${docs.dir}"
              packagenames="none"
-             link="${java9.api.url}"
+             link="${java.api.url}"
              overview="${src.dir}/intro.html"
              access="${build.javadoc.access}"
              sourcepath="${src.dir}"
              classpath=""
-             executable="${javadoc9}">
+             source="${build.main.javadoc.source}"
+             executable="${build.main.javadoc}">
       <fileset dir="${src.dir}" defaultexcludes="yes">
-        <include name="**/*.java"/>
+        <include name="java/**/*.java"/>
       </fileset>
-      <arg line="-Xdocrootparent ${java9.docroot.url}"/>
+      <arg line="-Xdocrootparent ${java.docroot.url}"/>
       <arg line="-Xmaxerrs 1000 -Xmaxwarns 1000"/>
+      <arg line="-Xmaxerrs 1000 -Xmaxwarns 1"/>
+      <arg value="-quiet"/>
       <arg value="-XDignore.symbol.file=true"/>
+      <arg value="-html5"/>
+      <arg value="-Xdoclint:all,-missing"/>
       <arg value="--patch-module=java.base=${src.dir}"/>
-      <arg value="-tag"/>
-      <arg value="${javadoc.jls.option}"/>
-<!-- @apiNote currently unused -->
-<!--       <arg value="-tag"/> -->
-<!--       <arg value="apiNote:a:API Note:"/> -->
-      <arg value="-tag"/>
-      <arg value="implSpec:a:Implementation Requirements:"/>
-      <arg value="-tag"/>
-      <arg value="implNote:a:Implementation Note:"/>
-<!-- tags added in jdk9: currently unused -->
-<!--       <arg value="-tag"/> -->
-<!--       <arg value="revised:X"/> -->
-<!--       <arg value="-tag"/> -->
-<!--       <arg value="spec:X"/> -->
+      <arg value="--frames" if:set="use-frames"/>
+      <arg value="--override-methods=summary"/>
+      <arg value="-tag"/> <arg value="${javadoc.jls.option}"/>
+      <arg value="-tag"/> <arg value="implSpec:a:Implementation Requirements:"/>
+      <arg value="-tag"/> <arg value="implNote:a:Implementation Note:"/>
+      <arg value="-tag"/> <arg value="apiNote:a:API Note:"/>
     </javadoc>
   </target>
 
-
   <target name="dist"
           depends="dist-clean, dist-jar, dist-docs"
           description="Puts all distributable products in single hierarchy"/>
 
-
-  <target name="release"
-          depends="dist"
-          description="Puts entire CVS tree, plus distribution productions, in a jar">
-
-    <property name="release.jar" value="dist/jsr166-${version}-dist.jar"/>
-
-    <jar basedir="${basedir}" destfile="${release.jar}">
-      <!-- <exclude name="build/**"/> -->
-      <exclude name="${release.jar}"/>
-      <exclude name="user.properties"/>
-      <exclude name="etc/notes/**"/>
-      <exclude name="src/emulation/**"/>
-      <exclude name="**/SyntaxTest.java"/>
-      <exclude name="**/SuperfluousAbstract.java"/>
-      <manifest>
-        <attribute name="Built-By" value="${user.name}"/>
-        <attribute name="Implementation-Vendor" value="JCP JSR-166 Expert Group."/>
-      </manifest>
-    </jar>
-  </target>
-
-
   <target name="clean"
           description="Removes all build products">
-
     <delete dir="${build.dir}"/>
-
   </target>
 
-
   <target name="dist-clean"
           description="Removes all build and distribution products">
-
     <delete dir="${build.dir}"/>
     <delete dir="${dist.dir}"/>
-
   </target>
 
-
   <target name="dist-jar"
           depends="clean, jar">
     <copy file="${product.jar}" todir="${dist.dir}"/>
@@ -531,15 +412,14 @@
   </target>
 
   <target name="tck"
-	  depends="jar"
+          depends="jar"
           description="Runs tck tests for src/main directly">
-
     <run-tck-tests
-      target="${build.main.java.version}"
+      target="${java.runtime.target}"
       workdir="${build.dir}"
       classes="${product.jar}">
       <javac-elements>
-        <compilerarg value="-Werror"/>
+        <!-- <compilerarg value="-Werror"/> -->
       </javac-elements>
     </run-tck-tests>
   </target>
@@ -566,45 +446,45 @@
   </target>
 
   <target name="jtreg"
-	  depends="jar"
+          depends="jar"
           description="Runs jtreg tests for src/main using the jtreg ant task">
     <run-jtreg-tests
-       target="${build.main.java.version}"
+       target="${java.runtime.target}"
        workdir="${build.dir}"
        classes="${product.jar}"/>
   </target>
 
   <target name="test"
           depends="tck, tck-parallelism-1, tck-parallelism-0, jtreg"
-          description="Runs tck and jtreg tests for src/main">
-  </target>
-
-<!--   <target name="jtreg8" description="Runs jtreg tests with jdk8"> -->
-
-<!--     <antcall target="jtreg"> -->
-<!--       <param name="build.main.java.version" value="8"/> -->
-<!--       <param name="build.main.javac" value="${javac8}"/> -->
-<!--     </antcall> -->
-
-<!--   </target> -->
-
-<!--   <target name="test89" -->
-<!--           description="Runs tck and jtreg tests for src/main for multiple java versions"> -->
-
-<!--     <antcall target="clean"/> -->
-<!--     <antcall target="test"> -->
-<!--       <param name="build.main.java.version" value="8"/> -->
-<!--       <param name="build.main.javac" value="${javac8}"/> -->
-<!--     </antcall> -->
-
-<!--     <antcall target="clean"/> -->
-<!--     <antcall target="test"> -->
-<!--       <param name="build.main.java.version" value="9"/> -->
-<!--       <param name="build.main.javac" value="${javac9}"/> -->
-<!--     </antcall> -->
-
-<!--   </target> -->
+          description="Runs tck and jtreg tests for src/main"/>
 
+  <target name="test-version-permutations"
+          depends="test17, test19, clean, test, docs"
+          description="Runs tck and jtreg tests for various build-time and runtime java versions"/>
+
+
+  <target name="test17">
+    <antcall>
+      <param name="java.runtime.target" value="17"/>
+      <param name="build.main.javac" value="${javac17}"/>
+      <param name="build.main.javadoc" value="${javadoc17}"/>
+      <param name="build.main.javadoc.source" value="17"/>
+      <target name="clean"/>
+      <target name="test"/>
+      <target name="docs"/>
+    </antcall>
+  </target>
+  <target name="test19">
+    <antcall>
+      <param name="java.runtime.target" value="19"/>
+      <param name="build.main.javac" value="${javac19}"/>
+      <param name="build.main.javadoc" value="${javadoc19}"/>
+      <param name="build.main.javadoc.source" value="19"/>
+      <target name="clean"/>
+      <target name="test"/>
+      <target name="docs"/>
+    </antcall>
+  </target>
 
 
   <target name="configure-compiler">
@@ -627,40 +507,8 @@
   </target>
 
 
-
-  <!-- Various demos and test programs -->
-
-
-  <!-- description="Benchmark from Doug Lea's AQS paper" -->
-  <target name="loops" depends="configure-compiler">
-
-    <mkdir dir="${build.loops.dir}"/>
-
-    <javac srcdir="${loops.src.dir}"
-          destdir="${build.loops.dir}"
-            debug="${build.debug}"
-       debuglevel="${build.debuglevel}"
-      deprecation="${build.deprecation}"
-           source="${build.sourcelevel}"
-           target="${build.sourcelevel}"
-         encoding="ASCII"
-             fork="true">
-
-      <compilerarg line="${build.args}"/>
-      <classpath refid="loops.classpath"/>
-      <compilerarg value="-XDignore.symbol.file=true"/>
-
-    </javac>
-
-    <java classname="ALoops" fork="true">
-      <classpath refid="loops.classpath"/>
-    </java>
-
-  </target>
-
-
   <target name="compile-test-loops" depends="jar"
-          description="compile all the perf tests in src/test/loops">
+          description="Compiles all the perf tests in src/test/loops">
 
     <mkdir dir="${build.dir}/test/loops"/>
 
@@ -672,844 +520,36 @@
            includeAntRuntime="false"
            includeJavaRuntime="false"
            encoding="ASCII"
-           executable="${javac9}"
+           executable="${build.main.javac}"
            fork="true">
 
       <include name="*.java"/>
       <compilerarg value="-XDignore.symbol.file=true"/>
-      <compilerarg value="-Xlint:all,-unchecked,-rawtypes,-serial"/>
-      <compilerarg value="-Xbootclasspath/p:${product.jar}"/>
-      <compilerarg line="${build.args}"/>
-
-    </javac>
-
-  </target>
-
-
-  <!-- jsr166 4jdk8 -->
-
-  <target name="4jdk8compile"
-          depends="configure-compiler"
-          description="Compiles src/jdk8 sources, targeting jdk8">
-
-    <mkdir dir="${build.4jdk8.classes.dir}"/>
-
-    <javac srcdir="${4jdk8src.dir}"
-           destdir="${build.4jdk8.classes.dir}"
-           debug="${build.debug}"
-           debuglevel="${build.debuglevel}"
-           deprecation="${build.deprecation}"
-           source="8"
-           target="8"
-           classpath=""
-           bootclasspath="${bootclasspath8}"
-           includeAntRuntime="false"
-           includeJavaRuntime="false"
-           encoding="ASCII"
-           executable="${javac8}"
-           fork="true">
-
-      <include name="**/*.java"/>
-      <compilerarg value="-Xprefer:source"/>
-      <compilerarg value="-XDignore.symbol.file=true"/>
-      <compilerarg value="-Xlint:all"/>
-      <compilerarg value="-Werror"/>
-      <compilerarg line="${build.args}"/>
-
-    </javac>
-  </target>
-
-  <target name="4jdk8doclint"
-          depends="configure-compiler"
-          description="Finds doclint warnings">
-
-    <mkdir dir="${build.4jdk8.classes.dir}"/>
-
-    <javac srcdir="${4jdk8src.dir}"
-           destdir="${build.4jdk8.classes.dir}"
-           debug="${build.debug}"
-           debuglevel="${build.debuglevel}"
-           deprecation="${build.deprecation}"
-           source="8"
-           target="8"
-           classpath=""
-           bootclasspath="${bootclasspath8}"
-           includeAntRuntime="false"
-           includeJavaRuntime="false"
-           encoding="ASCII"
-           executable="${javac8}"
-           fork="true">
-
-      <include name="**/*.java"/>
-      <compilerarg value="-Xprefer:source"/>
-      <compilerarg value="-XDignore.symbol.file=true"/>
-      <compilerarg value="-Xlint:all"/>
-      <compilerarg value="-Xdoclint:all/protected,reference/private"/>
-      <compilerarg line="${build.args}"/>
-
-    </javac>
-  </target>
-
-
-  <target name="4jdk8jar"
-          depends="4jdk8compile"
-          description="Builds library jar from compiled sources">
-
-    <jar destfile="${4jdk8product.jar}">
-      <fileset dir="${build.4jdk8.classes.dir}"/>
-      <manifest>
-        <attribute name="Built-By" value="${user.name}"/>
-        <attribute name="Implementation-Vendor" value="JCP JSR-166 Expert Group."/>
-      </manifest>
-    </jar>
-
-  </target>
-
-
-  <target name="4jdk8-tck"
-	  depends="4jdk8jar"
-          description="Runs tck tests for jsr166-4jdk8 directly">
-
-    <run-tck-tests
-      target="8"
-      workdir="${build.4jdk8.dir}"
-      classes="${4jdk8product.jar}">
-      <javac-elements>
-        <!-- JDK9+ test classes -->
-        <exclude name="*9Test.java"/>
-        <exclude name="*10Test.java"/>
-        <compilerarg value="-Werror"/>
-      </javac-elements>
-    </run-tck-tests>
-  </target>
-
-
-  <target name="4jdk8-jtreg"
-	  depends="4jdk8jar"
-          description="Runs jtreg tests for jsr166-4jdk8 using the jtreg ant task">
-    <run-jtreg-tests
-       target="8"
-       workdir="${build.4jdk8.dir}"
-       classes="${4jdk8product.jar}"/>
-  </target>
-
-
-  <target name="4jdk8-test"
-	  depends="4jdk8-tck, 4jdk8-jtreg"
-          description="Runs tck and jtreg tests for jsr166-4jdk8">
-  </target>
-
-
-  <target name="4jdk8docs"
-          description="Builds javadocs for src/jdk8 to dist dir">
-
-    <delete dir="${4jdk8docs.dir}"/>
-    <mkdir dir="${4jdk8docs.dir}"/>
-
-    <javadoc destdir="${4jdk8docs.dir}"
-             packagenames="none"
-             link="${java8.api.url}"
-             overview="${4jdk8src.dir}/intro.html"
-             access="${build.javadoc.access}"
-             sourcepath="${4jdk8src.dir}:${jdk8.src.dir}"
-             classpath=""
-             executable="${javadoc8}"
-             failonerror = "true">
-      <fileset dir="${4jdk8src.dir}" defaultexcludes="yes">
-        <include name="**/*.java"/>
-      </fileset>
-      <arg line="-Xdocrootparent ${java8.docroot.url}"/>
-      <arg value="-XDignore.symbol.file=true"/>
-      <arg value="-tag"/>
-      <arg value="${javadoc.jls.option}"/>
-<!-- @apiNote currently unused -->
-<!--       <arg value="-tag"/> -->
-<!--       <arg value="apiNote:a:&lt;em&gt;API Note:&lt;/em&gt;"/> -->
-      <arg value="-tag"/>
-      <arg value="implSpec:a:&lt;em&gt;Implementation Requirements:&lt;/em&gt;"/>
-      <arg value="-tag"/>
-      <arg value="implNote:a:&lt;em&gt;Implementation Note:&lt;/em&gt;"/>
-    </javadoc>
-  </target>
-
-
-  <target name="4jdk8dist"
-          depends="4jdk8dist-jar, 4jdk8dist-docs"
-          description="Puts all distributable products in single hierarchy"/>
-
-
-  <target name="4jdk8clean"
-          description="Removes all 4jdk8 build products">
-
-    <delete dir="${build.4jdk8.dir}"/>
-
-  </target>
-
-
-  <target name="4jdk8dist-jar"
-          depends="4jdk8clean, 4jdk8jar">
-    <copy file="${4jdk8product.jar}" todir="${dist.dir}"/>
-  </target>
-
-
-  <target name="4jdk8dist-docs"
-          depends="4jdk8clean, 4jdk8docs">
-    <mirror-dir src="${4jdk8docs.dir}" dst="${dist.4jdk8docs.dir}"/>
-  </target>
-
-
-
-  <!-- jsr166 4jdk7 -->
-
-  <target name="4jdk7compile"
-          depends="configure-compiler"
-          description="Compiles src/jdk7 sources, targeting jdk7">
-
-    <mkdir dir="${build.4jdk7.classes.dir}"/>
-
-    <javac srcdir="${4jdk7src.dir}"
-           destdir="${build.4jdk7.classes.dir}"
-           debug="${build.debug}"
-           debuglevel="${build.debuglevel}"
-           deprecation="${build.deprecation}"
-           source="6"
-           target="6"
-           classpath=""
-           bootclasspath="${bootclasspath6}"
-           includeAntRuntime="false"
-           includeJavaRuntime="false"
-           encoding="ASCII"
-           executable="${javac7}"
-           fork="true">
-
-      <include name="**/*.java"/>
-      <compilerarg value="-Xprefer:source"/>
-      <compilerarg value="-XDignore.symbol.file=true"/>
-      <compilerarg value="-Xlint:all"/>
-      <compilerarg value="-Werror"/>
-      <compilerarg line="${build.args}"/>
-
-    </javac>
-  </target>
-
-  <target name="4jdk7doclint"
-          depends="configure-compiler"
-          description="Finds doclint warnings">
-
-    <mkdir dir="${build.4jdk7.classes.dir}"/>
-
-    <javac srcdir="${4jdk7src.dir}"
-           destdir="${build.4jdk7.classes.dir}"
-           debug="${build.debug}"
-           debuglevel="${build.debuglevel}"
-           deprecation="${build.deprecation}"
-           source="6"
-           target="6"
-           classpath=""
-           bootclasspath="${bootclasspath6}"
-           includeAntRuntime="false"
-           includeJavaRuntime="false"
-           encoding="ASCII"
-           executable="${javac8}"
-           fork="true">
-
-      <include name="**/*.java"/>
-      <compilerarg value="-Xprefer:source"/>
-      <compilerarg value="-XDignore.symbol.file=true"/>
-      <compilerarg value="-Xlint:all"/>
-      <compilerarg value="-Xdoclint:all/protected"/>
-      <compilerarg line="${build.args}"/>
-
-    </javac>
-  </target>
-
-
-  <target name="4jdk7jar"
-          depends="4jdk7compile"
-          description="Builds library jar from compiled sources">
-
-    <jar destfile="${4jdk7product.jar}">
-      <fileset dir="${build.4jdk7.classes.dir}"/>
-      <manifest>
-        <attribute name="Built-By" value="${user.name}"/>
-        <attribute name="Implementation-Vendor" value="JCP JSR-166 Expert Group."/>
-      </manifest>
-    </jar>
-
-  </target>
-
-
-  <target name="4jdk7-tck"
-	  depends="4jdk7jar"
-          description="Runs tck tests for jsr166-4jdk7 directly">
-
-    <run-tck-tests
-      target="7"
-      workdir="${build.4jdk7.dir}"
-      classes="${4jdk7product.jar}">
-      <javac-elements>
-        <!-- JDK8+ test classes -->
-        <exclude name="*8Test.java"/>
-        <exclude name="*9Test.java"/>
-        <exclude name="*10Test.java"/>
-        <exclude name="DoubleAccumulatorTest.java"/>
-        <exclude name="DoubleAdderTest.java"/>
-        <exclude name="LongAccumulatorTest.java"/>
-        <exclude name="LongAdderTest.java"/>
-        <exclude name="CompletableFutureTest.java"/>
-        <exclude name="SplittableRandomTest.java"/>
-        <exclude name="StampedLockTest.java"/>
-        <exclude name="SubmissionPublisherTest.java"/>
-        <compilerarg value="-Werror"/>
-      </javac-elements>
-    </run-tck-tests>
-  </target>
-
-
-  <!-- Runs tck tests for jsr166-4jdk7 via junit task (dead experiment) -->
-  <target name="4jdk7-tck-junit"
-          depends="4jdk7compile">
-
-    <junit printsummary="true"
-           showoutput="true"
-           errorProperty="junit.failed"
-           failureProperty="junit.failed"
-           includeantruntime="true"
-           jvm="${java7}"
-           fork="true">
-
-      <jvmarg value="-Xbootclasspath/p:${4jdk7product.jar}"/>
-      <jvmarg value="-server"/>
-
-      <classpath>
-        <pathelement location="${junit.jar}"/>
-        <pathelement location="${build.4jdk7.tck.classes.dir}"/>
-      </classpath>
-
-      <formatter type="brief"/>
-
-      <test name="${jsr166.tckTestClass}" haltonfailure="no">
-      </test>
-
-    </junit>
-  </target>
-
-  <target name="4jdk7-jtreg"
-	  depends="4jdk7jar"
-          description="Runs jtreg tests for jsr166-4jdk7 using the jtreg ant task">
-    <run-jtreg-tests
-       target="7"
-       workdir="${build.4jdk7.dir}"
-       classes="${4jdk7product.jar}"/>
-  </target>
-
-
-  <target name="4jdk7-test"
-	  depends="4jdk7-tck, 4jdk7-jtreg"
-          description="Runs tck and jtreg tests for jsr166-4jdk7">
-  </target>
-
-
-  <target name="4jdk7docs"
-          description="Builds javadocs for src/jdk7 to dist dir">
-
-    <delete dir="${4jdk7docs.dir}"/>
-    <mkdir dir="${4jdk7docs.dir}"/>
-
-    <javadoc destdir="${4jdk7docs.dir}"
-             packagenames="none"
-             link="${java7.api.url}"
-             overview="${4jdk7src.dir}/intro.html"
-             access="${build.javadoc.access}"
-             sourcepath="${4jdk7src.dir}:${jdk7.src.dir}"
-             classpath=""
-             executable="${javadoc7}"
-             failonerror = "true">
-      <fileset dir="${4jdk7src.dir}" defaultexcludes="yes">
-        <include name="**/*.java"/>
-      </fileset>
-      <arg line="-Xdocrootparent ${java7.docroot.url}"/>
-      <arg value="-XDignore.symbol.file=true"/>
-    </javadoc>
-  </target>
-
-
-  <target name="4jdk7dist"
-          depends="4jdk7dist-jar, 4jdk7dist-docs"
-          description="Puts all distributable products in single hierarchy"/>
-
-
-  <target name="4jdk7clean"
-          description="Removes all 4jdk7 build products">
-
-    <delete dir="${build.4jdk7.dir}"/>
-
-  </target>
-
-
-  <target name="4jdk7dist-jar"
-          depends="4jdk7clean, 4jdk7jar">
-    <copy file="${4jdk7product.jar}" todir="${dist.dir}"/>
-  </target>
-
-
-  <target name="4jdk7dist-docs"
-          depends="4jdk7clean, 4jdk7docs">
-    <mirror-dir src="${4jdk7docs.dir}" dst="${dist.4jdk7docs.dir}"/>
-  </target>
-
-
-  <!-- jsr166x -->
-
-  <target name="jsr166xcompile"
-          depends="configure-compiler"
-          description="Compiles jsr166x sources to build dir">
-
-    <mkdir dir="${build.jsr166x.classes.dir}"/>
-
-    <javac srcdir="${topsrc.dir}"
-           destdir="${build.jsr166x.classes.dir}"
-           debug="${build.debug}"
-           debuglevel="${build.debuglevel}"
-           deprecation="${build.deprecation}"
-           classpath=""
-           bootclasspath="${bootclasspath6}"
-           source="5"
-           target="5"
-           includeAntRuntime="false"
-           includeJavaRuntime="false"
-           encoding="ASCII"
-           executable="${javac7}"
-           fork="true">
-
-      <include name="jsr166x/**/*.java"/>
-      <compilerarg value="-XDignore.symbol.file=true"/>
-      <compilerarg value="-Xlint:all,-unchecked,-rawtypes"/>
-      <compilerarg value="-Werror"/>
-      <compilerarg line="${build.args}"/>
-
-    </javac>
-  </target>
-
-
-  <target name="jsr166xjar"
-          depends="jsr166xcompile"
-          description="Builds library jar from compiled sources">
-
-    <jar destfile="${jsr166x.jar}">
-      <fileset dir="${build.jsr166x.classes.dir}"/>
-      <manifest>
-        <attribute name="Built-By" value="${user.name}"/>
-        <attribute name="Implementation-Vendor" value="JCP JSR-166 Expert Group."/>
-      </manifest>
-    </jar>
-
-  </target>
-
-
-  <target name="jsr166xdocs"
-          description="Builds javadocs to dist dir">
-
-    <delete dir="${jsr166xdocs.dir}"/>
-    <mkdir dir="${jsr166xdocs.dir}"/>
-
-    <javadoc destdir="${jsr166xdocs.dir}"
-             packagenames="jsr166x.*"
-             link="${java.api.url}"
-             access="${build.javadoc.access}"
-             sourcepath="${topsrc.dir}:${jdk6.src.dir}"
-             bootclasspath="${bootclasspath6}"
-             source="5"
-             executable="${javadoc7}"
-             failonerror = "true">
-      <arg line="-Xdocrootparent ${java.docroot.url}"/>
-      <arg value="-XDignore.symbol.file=true"/>
-
-    </javadoc>
-  </target>
-
-
-  <target name="jsr166xdist"
-          depends="jsr166xdist-jar, jsr166xdist-docs"
-          description="Puts all distributable products in single hierarchy"/>
-
-
-  <target name="jsr166xclean"
-          description="Removes all jsr166x build products">
-
-    <delete dir="${build.jsr166x.dir}"/>
-
-  </target>
-
-
-  <target name="jsr166xdist-jar"
-          depends="jsr166xclean, jsr166xjar">
-    <copy file="${jsr166x.jar}" todir="${dist.dir}"/>
-  </target>
-
-  <target name="jsr166xdist-docs"
-          depends="jsr166xclean, jsr166xdocs">
-    <mirror-dir src="${jsr166xdocs.dir}" dst="${dist.jsr166xdocs.dir}"/>
-  </target>
-
-  <!-- jsr166y -->
-
-
-  <target name="jsr166ycompile"
-          depends="configure-compiler"
-          description="Compiles jsr166y sources">
-
-    <mkdir dir="${build.jsr166y.classes.dir}"/>
-
-    <javac srcdir="${topsrc.dir}"
-           destdir="${build.jsr166y.classes.dir}"
-           debug="${build.debug}"
-           debuglevel="${build.debuglevel}"
-           deprecation="${build.deprecation}"
-           source="6"
-           target="6"
-           classpath=""
-           bootclasspath="${bootclasspath6}"
-           includeAntRuntime="false"
-           includeJavaRuntime="false"
-           encoding="ASCII"
-           executable="${javac7}"
-           fork="true">
-
-      <include name="jsr166y/**/*.java"/>
-      <compilerarg value="-XDignore.symbol.file=true"/>
-      <compilerarg value="-Xlint:all"/>
-      <compilerarg value="-Werror"/>
-      <compilerarg line="${build.args}"/>
-
-    </javac>
-  </target>
-
-
-  <target name="jsr166yjar"
-          depends="jsr166ycompile"
-          description="Builds library jar from compiled sources">
-
-    <jar destfile="${jsr166y.jar}" index="true">
-      <fileset dir="${build.jsr166y.classes.dir}"/>
-      <manifest>
-        <attribute name="Built-By" value="${user.name}"/>
-        <attribute name="Implementation-Vendor" value="JCP JSR-166 Expert Group."/>
-      </manifest>
-    </jar>
-
-  </target>
-
-
-  <target name="jsr166ydocs"
-          description="Builds javadocs to dist dir">
-
-    <delete dir="${jsr166ydocs.dir}"/>
-    <mkdir dir="${jsr166ydocs.dir}"/>
-
-    <javadoc destdir="${jsr166ydocs.dir}"
-             packagenames="jsr166y.*"
-             link="${java.api.url}"
-             access="${build.javadoc.access}"
-             sourcepath="${topsrc.dir}:${jdk6.src.dir}"
-             bootclasspath="${bootclasspath6}"
-             source="6"
-             executable="${javadoc7}"
-             failonerror = "true">
-      <arg line="-Xdocrootparent ${java.docroot.url}"/>
-      <arg value="-XDignore.symbol.file=true"/>
-
-    </javadoc>
-  </target>
-
-
-  <target name="jsr166ydist"
-          depends="jsr166ydist-jar, jsr166ydist-docs"
-          description="Puts all distributable products in single hierarchy"/>
-
-
-  <target name="jsr166yclean"
-          description="Removes all jsr166y build products">
-
-    <delete dir="${build.jsr166y.dir}"/>
-
-  </target>
-
-
-  <target name="jsr166ydist-jar"
-          depends="jsr166yclean, jsr166yjar">
-    <copy file="${jsr166y.jar}" todir="${dist.dir}"/>
-  </target>
-
-  <target name="jsr166ydist-docs"
-          depends="jsr166yclean, jsr166ydocs">
-    <mirror-dir src="${jsr166ydocs.dir}" dst="${dist.jsr166ydocs.dir}"/>
-  </target>
-
-
-  <!-- extra166y -->
-
-
-  <target name="extra166ycompile"
-          depends="configure-compiler, jsr166yjar"
-          description="Compiles extra166y sources">
-
-    <mkdir dir="${build.extra166y.classes.dir}"/>
-
-    <javac srcdir="${topsrc.dir}"
-           destdir="${build.extra166y.classes.dir}"
-           debug="${build.debug}"
-           debuglevel="${build.debuglevel}"
-           deprecation="${build.deprecation}"
-           bootclasspath="@{jsr166y.jar}:${bootclasspath6}"
-           classpath=""
-           source="6"
-           target="6"
-           includeAntRuntime="false"
-           includeJavaRuntime="false"
-           encoding="ASCII"
-           executable="${javac7}"
-           fork="true">
-
-      <include name="extra166y/**/*.java"/>
-      <compilerarg value="-XDignore.symbol.file=true"/>
-      <compilerarg value="-Xlint:all,-unchecked,-rawtypes,-serial"/>
-      <compilerarg value="-Werror"/>
-      <compilerarg line="${build.args}"/>
-
-    </javac>
-  </target>
-
-
-  <target name="extra166yjar"
-          depends="extra166ycompile"
-          description="Builds library jar from compiled sources">
-
-    <jar destfile="${extra166y.jar}" index="true">
-      <fileset dir="${build.extra166y.classes.dir}"/>
-      <manifest>
-        <attribute name="Built-By" value="${user.name}"/>
-        <attribute name="Implementation-Vendor" value="JCP JSR-166 Expert Group."/>
-      </manifest>
-    </jar>
-
-  </target>
-
-
-  <target name="extra166ydocs"
-          description="Builds javadocs to build dir">
-
-    <delete dir="${extra166ydocs.dir}"/>
-    <mkdir dir="${extra166ydocs.dir}"/>
-
-    <javadoc destdir="${extra166ydocs.dir}"
-             packagenames="extra166y.*"
-             link="${java.api.url}"
-             access="${build.javadoc.access}"
-             sourcepath="${topsrc.dir}:${jdk6.src.dir}"
-             bootclasspath="${bootclasspath6}"
-             source="6"
-             executable="${javadoc7}">
-      <arg line="-Xdocrootparent ${java.docroot.url}"/>
-      <arg value="-XDignore.symbol.file=true"/>
-
-    </javadoc>
-  </target>
-
-
-  <target name="extra166ydist"
-          depends="extra166ydist-jar, extra166ydist-docs"
-          description="Puts all distributable products in single hierarchy"/>
-
-
-  <target name="extra166yclean"
-          description="Removes all extra166y build products">
-
-    <delete dir="${build.extra166y.dir}"/>
-
-  </target>
-
-
-  <target name="extra166ydist-jar"
-          depends="extra166yclean, extra166yjar">
-    <copy file="${extra166y.jar}" todir="${dist.dir}"/>
-  </target>
-
-  <target name="extra166ydist-docs"
-          depends="extra166yclean, extra166ydocs">
-    <mirror-dir src="${extra166ydocs.dir}" dst="${dist.extra166ydocs.dir}"/>
-  </target>
-
-  <!-- jsr166e -->
-
-  <property name="build.jsr166e.java.version" value="6"/>
-  <property name="build.jsr166e.javac" value="${javac6}"/>
-
-  <target name="jsr166ecompile"
-          depends="configure-compiler"
-          description="Compiles jsr166e sources">
-
-    <mkdir dir="${build.jsr166e.classes.dir}"/>
-
-    <javac srcdir="${topsrc.dir}"
-           destdir="${build.jsr166e.classes.dir}"
-           debug="${build.debug}"
-           debuglevel="${build.debuglevel}"
-           deprecation="${build.deprecation}"
-           source="${build.jsr166e.java.version}"
-           target="${build.jsr166e.java.version}"
-           classpath=""
-           includeAntRuntime="false"
-           includeJavaRuntime="false"
-           executable="${build.jsr166e.javac}"
-           fork="true">
-
-      <include name="jsr166e/**/*.java"/>
-      <compilerarg value="-XDignore.symbol.file=true"/>
-      <compilerarg value="-Xlint:all"/>
-      <compilerarg value="-Werror"/>
+      <compilerarg value="-Xlint:all,-unchecked,-rawtypes,-serial,-deprecation"/>
+      <compilerarg value="--patch-module=java.base=${src.dir}"/>
       <compilerarg line="${build.args}"/>
-
     </javac>
   </target>
 
-  <!-- jsr166e: find doclint errors -->
-  <target name="jsr166edoclint">
-
-    <mkdir dir="${build.jsr166e.classes.dir}"/>
-
-    <javac srcdir="${topsrc.dir}"
-           destdir="${build.jsr166e.classes.dir}"
-           debug="${build.debug}"
-           debuglevel="${build.debuglevel}"
-           deprecation="${build.deprecation}"
-           source="${build.jsr166e.java.version}"
-           target="${build.jsr166e.java.version}"
-           classpath=""
-           bootclasspath="${bootclasspath6}"
-           includeAntRuntime="false"
-           includeJavaRuntime="false"
-           executable="${javac8}"
-           fork="true">
-
-      <include name="jsr166e/**/*.java"/>
-      <compilerarg value="-XDignore.symbol.file=true"/>
-      <compilerarg value="-Xlint:all"/>
-      <compilerarg value="-Werror"/>
-      <compilerarg value="-Xdoclint:all/protected"/>
-
-    </javac>
-  </target>
-
-
-  <target name="jsr166ejar"
-          depends="jsr166ecompile"
-          description="Builds library jar from compiled sources">
-
-    <jar destfile="${jsr166e.jar}" index="true">
-      <fileset dir="${build.jsr166e.classes.dir}"/>
-      <manifest>
-        <attribute name="Built-By" value="${user.name}"/>
-        <attribute name="Implementation-Vendor" value="JCP JSR-166 Expert Group."/>
-      </manifest>
-    </jar>
-
-  </target>
-
-
-  <target name="jsr166edocs"
-          description="Builds javadocs to build dir">
-
-    <delete dir="${jsr166edocs.dir}"/>
-    <mkdir dir="${jsr166edocs.dir}"/>
-
-    <javadoc destdir="${jsr166edocs.dir}"
-             packagenames="jsr166e.*"
-             link="${java.api.url}"
-             access="${build.javadoc.access}"
-             sourcepath="${topsrc.dir}:${jdk6.src.dir}"
-             source="${build.jsr166e.java.version}"
-             executable="${javadoc7}"
-             failonerror = "true">
-      <arg line="-Xdocrootparent ${java.docroot.url}"/>
-      <arg value="-XDignore.symbol.file=true"/>
-
-    </javadoc>
-  </target>
-
-
-  <target name="jsr166e-tck-one-java-version"
-	  depends="jsr166ejar">
-
-    <echo message="Testing with jdk${build.jsr166e.java.version} ..."/>
-
-    <run-tck-tests
-      tck.src.dir="${test.src.dir}/tck-jsr166e"
-      target="${build.jsr166e.java.version}"
-      workdir="${build.jsr166e.dir}"
-      classes="${jsr166e.jar}"/>
-  </target>
-
-  <target name="jsr166e-tck"
-          description="Runs tck tests for jsr166e for multiple java versions">
-
-<!--     <antcall target="clean"/> -->
-<!--     <antcall target="jsr166e-tck-one-java-version"> -->
-<!--       <param name="build.jsr166e.java.version" value="8"/> -->
-<!--       <param name="build.jsr166e.javac" value="${javac8}"/> -->
-<!--     </antcall> -->
-
-    <antcall target="clean"/>
-    <antcall target="jsr166e-tck-one-java-version">
-      <param name="build.jsr166e.java.version" value="7"/>
-      <param name="build.jsr166e.javac" value="${javac7}"/>
-    </antcall>
-
-    <antcall target="clean"/>
-    <antcall target="jsr166e-tck-one-java-version">
-      <param name="build.jsr166e.java.version" value="6"/>
-      <param name="build.jsr166e.javac" value="${javac6}"/>
-    </antcall>
-  </target>
-
-
-  <target name="jsr166e-test"
-	  depends="jsr166e-tck"
-          description="Runs all tests for jsr166e">
-  </target>
-
-  <target name="jsr166edist"
-          depends="jsr166edist-jar, jsr166edist-docs"
-          description="Puts all distributable products in single hierarchy"/>
-
-
-  <target name="jsr166eclean"
-          description="Removes all jsr166e build products">
-    <delete dir="${build.jsr166e.dir}"/>
-  </target>
-
-
-  <target name="jsr166edist-jar"
-          depends="jsr166eclean, jsr166ejar">
-    <copy file="${jsr166e.jar}" todir="${dist.dir}"/>
-  </target>
-
-  <target name="jsr166edist-docs"
-          depends="jsr166eclean, jsr166edocs">
-    <mirror-dir src="${jsr166edocs.dir}" dst="${dist.jsr166edocs.dir}"/>
-  </target>
 
+  <!-- old branches no longer maintained.  build support deleted -->
+  <!-- jsr166 4jdk8; (no longer maintained as of 2019-10) -->
+  <!-- jsr166 4jdk7 (no longer maintained) -->
+  <!-- jsr166x (no longer maintained) -->
+  <!-- jsr166y (no longer maintained) -->
+  <!-- extra166y (no longer maintained) -->
+  <!-- jsr166e (no longer maintained) -->
 
 <!-- Find buglets that can be detected by static build tools -->
 
-  <target name="lint">
-    <antcall target="dists">
-      <param name="build.javadoc.access" value="public"/>
-    </antcall>
-  </target>
+<!--   <target name="lint"> -->
+<!--     <antcall target="dists"> -->
+<!--       <param name="build.javadoc.access" value="protected"/> -->
+<!--     </antcall> -->
+<!--   </target> -->
 
 <!-- Generates all doclint warnings, even for private methods (rarely useful) -->
-  <target name="lint-private">
+  <target name="doclint-private">
     <antcall target="dist">
       <param name="build.javadoc.access" value="private"/>
     </antcall>
@@ -1517,12 +557,48 @@
 
 
 <!-- ==============================================================
-  Experimental errorprone support - http://errorprone.info
-  You may need to bring your own errorprone jar.
+  Experimental errorprone support
+  https://errorprone.info
+  https://errorprone.info/docs/installation
+  https://github.com/google/error-prone/issues/1143
 =================================================================== -->
+  <path id="errorprone.processorpath.path">
+    <pathelement location="${lib.dir}/error_prone_core-2.3.4-with-dependencies.jar"/>
+    <pathelement location="${lib.dir}/dataflow-2.5.7.jar"/>
+    <pathelement location="${lib.dir}/javacutil-2.5.7.jar"/>
+    <pathelement location="${lib.dir}/jFormatString-3.0.0.jar"/>
+    <pathelement location="${lib.dir}/caffeine-2.8.0.jar"/>
+  </path>
+  <property name="errorprone.processorpath" refid="errorprone.processorpath.path" />
+  <property name="errorprone.jsr166.user.flags" value=""/>
+  <property name="errorprone.jsr166.flags"
+            value="-Xep:HashtableContains:OFF
+                   -Xep:PreferJavaTimeOverload:OFF
+                   -Xep:JdkObsolete:OFF
+                   -Xep:MissingOverride:OFF
+                   -Xep:MissingFail:OFF
+                   -Xep:ThreadPriorityCheck:OFF
+                   -Xep:MixedArrayDimensions:ERROR
+                   -Xep:RemoveUnusedImports:ERROR
+                   -Xep:EmptyIf:ERROR
+                   -Xep:MultipleTopLevelClasses:ERROR
+                   -Xep:ClassName:ERROR
+                   -Xep:LongLiteralLowerCaseSuffix:ERROR
+                   -Xep:RedundantThrows:ERROR
+                   -Xep:IdentityBinaryExpression:WARN
+                   -Xep:ConstructorInvokesOverridable:WARN
+                   -Xep:MethodCanBeStatic:WARN
+                   ${errorprone.jsr166.user.flags}"/>
+  <!-- -Xep:WildcardImport:ERROR -->
+  <property name="errorprone.jsr166.test.flags"
+            value="-Xep:StringSplitter:OFF
+                   -Xep:BoxedPrimitiveConstructor:OFF
+                   -Xep:UnnecessaryParentheses:OFF
+                   -Xep:ModifyingCollectionWithItself:OFF"/>
+  <!-- ant -emacs errorprone |& grep -EA1 '(warning|error):|warnings' -->
   <target name="errorprone"
           depends="clean, configure-compiler"
-          description="Run errorprone over jsr166 source code">
+          description="Run errorprone over jsr166 source code (experimental)">
 
     <local name="destdir"/>
     <property name="destdir" value="${build.classes.dir}/java.base"/>
@@ -1541,28 +617,20 @@
            fork="true">
 
       <include name="**/*.java"/>
-      <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED"/>
-      <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED"/>
-      <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED"/>
-      <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED"/>
-      <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED"/>
-      <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED"/>
-      <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED"/>
-      <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED"/>
-      <compilerarg value="-J--add-opens=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED"/>
-      <compilerarg line="-processorpath ${lib.dir}/error_prone_ant-2.0.20-SNAPSHOT.jar"/>
+      <!-- Needed to silence -Xep:FutureReturnValueIgnored -->
+      <compilerarg value="-J--illegal-access=permit"/>
+      <compilerarg value="-XDcompilePolicy=simple"/>
+      <compilerarg value="-processorpath"/>
+      <compilerarg pathref="errorprone.processorpath.path"/>
       <compilerarg value="-Xplugin:ErrorProne
-                          -Xep:IdentityBinaryExpression:WARN 
-                          -Xep:MissingOverride:OFF
-                          -Xep:MixedArrayDimensions:WARN 
-                          -Xep:RemoveUnusedImports:ERROR 
-                          -Xep:MethodCanBeStatic:WARN"/>
+                          ${errorprone.jsr166.flags}"/>
       <compilerarg value="--patch-module=java.base=${src.dir}"/>
       <compilerarg value="-Xprefer:source"/>
       <compilerarg value="-XDignore.symbol.file=true"/>
       <compilerarg value="-Xlint:all"/>
       <compilerarg value="-Xdoclint:all/protected,reference/private"/>
-      <compilerarg line="-Xmaxerrs 3000 -Xmaxwarns 3000"/>
+      <!--      <compilerarg line="-Xmaxerrs 3000 -Xmaxwarns 3000"/> -->
+      <compilerarg line="-Xmaxerrs 3000 -Xmaxwarns 1"/>
       <compilerarg line="${build.args}"/>
     </javac>
 
@@ -1571,34 +639,47 @@
     </jar>
 
     <run-tck-tests
-      target="${build.main.java.version}"
+      target="${java.runtime.target}"
       workdir="${build.dir}"
       classes="${product.jar}">
       <javac-elements>
-        <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED"/>
-        <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED"/>
-        <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED"/>
-        <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED"/>
-        <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED"/>
-        <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED"/>
-        <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED"/>
-        <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED"/>
-        <compilerarg value="-J--add-opens=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED"/>
-        <compilerarg line="-processorpath ${lib.dir}/error_prone_ant-2.0.20-SNAPSHOT.jar"/>
-        <compilerarg value="-Xplugin:ErrorProne 
-                            -Xep:IdentityBinaryExpression:WARN 
-                            -Xep:BoxedPrimitiveConstructor:OFF 
-                            -Xep:HashtableContains:OFF 
-                            -Xep:ModifyingCollectionWithItself:OFF 
-                            -Xep:MissingOverride:OFF 
-                            -Xep:MixedArrayDimensions:WARN 
-                            -Xep:RemoveUnusedImports:ERROR 
-                            -Xep:MethodCanBeStatic:WARN"/>
-        <compilerarg line="-Xmaxerrs 3000 -Xmaxwarns 3000"/>
+        <!-- Needed to silence -Xep:FutureReturnValueIgnored -->
+        <compilerarg value="-J--illegal-access=permit"/>
+        <compilerarg value="-XDcompilePolicy=simple"/>
+        <compilerarg line="-processorpath ${errorprone.processorpath}"/>
+        <compilerarg value="-Xplugin:ErrorProne
+                            ${errorprone.jsr166.flags}
+                            ${errorprone.jsr166.test.flags}"/>
+        <!--      <compilerarg line="-Xmaxerrs 3000 -Xmaxwarns 3000"/> -->
+        <compilerarg line="-Xmaxerrs 3000 -Xmaxwarns 1"/>
       </javac-elements>
     </run-tck-tests>
   </target>
 
+  <!-- ant -emacs errorprone-jtreg |& grep -EA1 '(warning|error):' -->
+  <!-- -XDcompilePolicy=simple or byfile avoids confusing UnusedImports -->
+  <target name="errorprone-jtreg"
+          depends="jar"
+          description="Run errorprone over jtreg tests (experimental)">
+
+    <run-jtreg-tests
+       target="${java.runtime.target}"
+       workdir="${build.dir}"
+       classes="${product.jar}"
+       verbose="all">
+      <jtreg-elements>
+        <arg value="-javacoption:-XDcompilePolicy=simple"/>
+        <arg value="-javacoption:-processorpath"/>
+        <arg value="-javacoption:${errorprone.processorpath}"/>
+        <arg value="-javacoption:-Xplugin:ErrorProne
+                            ${errorprone.jsr166.flags}
+                            ${errorprone.jsr166.test.flags}
+                            -Xep:MultipleTopLevelClasses:WARN
+                            -Xep:NonAtomicVolatileUpdate:OFF"/>
+      </jtreg-elements>
+    </run-jtreg-tests>
+  </target>
+
 
 <!-- ==============================================================
   Running guava tests against jsr166 code
@@ -1652,8 +733,8 @@
     <get src="http://repo2.maven.org/maven2/com/google/guava/guava-testlib/${guava.version}/guava-testlib-${guava.version}-tests.jar"
          dest="${guava.dir}/guava-testlib-tests.jar" usetimestamp="true"/>
     <junit printsummary="true" showoutput="true" haltonfailure="true"
-           jvm="${java9}" fork="true">
-      <jvmarg line="-ea -esa --patch-module java.base=${product.jar}"/>
+           jvm="${build.main.java}" fork="true">
+      <jvmarg line="-ea -esa --patch-module=java.base=${product.jar}"/>
       <formatter type="brief"/>
       <classpath>
         <pathelement location="${guava.dir}/guava-testlib-tests.jar"/>