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root/jsr166/jsr166/src/test/tck/JSR166TestCase.java

Comparing jsr166/src/test/tck/JSR166TestCase.java (file contents):
Revision 1.62 by jsr166, Mon Oct 11 05:40:41 2010 UTC vs.
Revision 1.96 by jsr166, Mon Jan 21 19:51:46 2013 UTC

#	Line 1 | Line 1
1		/*
2		* Written by Doug Lea with assistance from members of JCP JSR-166
3		* Expert Group and released to the public domain, as explained at
4	<	* http://creativecommons.org/licenses/publicdomain
4	>	* http://creativecommons.org/publicdomain/zero/1.0/
5		* Other contributors include Andrew Wright, Jeffrey Hayes,
6		* Pat Fisher, Mike Judd.
7		*/
8
9		import junit.framework.*;
10	+	import java.io.ByteArrayInputStream;
11	+	import java.io.ByteArrayOutputStream;
12	+	import java.io.ObjectInputStream;
13	+	import java.io.ObjectOutputStream;
14	+	import java.lang.management.ManagementFactory;
15	+	import java.lang.management.ThreadInfo;
16	+	import java.util.ArrayList;
17	+	import java.util.Arrays;
18	+	import java.util.Date;
19	+	import java.util.Enumeration;
20	+	import java.util.List;
21	+	import java.util.NoSuchElementException;
22		import java.util.PropertyPermission;
23		import java.util.concurrent.*;
24	+	import java.util.concurrent.atomic.AtomicBoolean;
25		import java.util.concurrent.atomic.AtomicReference;
26		import static java.util.concurrent.TimeUnit.MILLISECONDS;
27	+	import static java.util.concurrent.TimeUnit.NANOSECONDS;
28		import java.security.CodeSource;
29		import java.security.Permission;
30		import java.security.PermissionCollection;
#	Line 60 | Line 74 | import java.security.SecurityPermission;
74		*
75		* </ol>
76		*
77	<	* <p> <b>Other notes</b>
77	>	* <p><b>Other notes</b>
78		* <ul>
79		*
80		* <li> Usually, there is one testcase method per JSR166 method
#	Line 131 | Line 145 | public class JSR166TestCase extends Test
145		System.out.printf("%n%s: %d%n", toString(), elapsedMillis);
146		}
147		}
148	<
148	>
149		/**
150	<	* Runs all JSR166 unit tests using junit.textui.TestRunner
150	>	* Runs all JSR166 unit tests using junit.textui.TestRunner.
151	>	* Optional command line arg provides the number of iterations to
152	>	* repeat running the tests.
153		*/
154		public static void main(String[] args) {
155		if (useSecurityManager) {
#	Line 251 | Line 267 | public class JSR166TestCase extends Test
267		return 50;
268		}
269
254	–
270		/**
271		* Sets delays as multiples of SHORT_DELAY.
272		*/
#	Line 259 | Line 274 | public class JSR166TestCase extends Test
274		SHORT_DELAY_MS = getShortDelay();
275		SMALL_DELAY_MS  = SHORT_DELAY_MS * 5;
276		MEDIUM_DELAY_MS = SHORT_DELAY_MS * 10;
277	<	LONG_DELAY_MS   = SHORT_DELAY_MS * 50;
277	>	LONG_DELAY_MS   = SHORT_DELAY_MS * 200;
278	>	}
279	>
280	>	/**
281	>	* Returns a timeout in milliseconds to be used in tests that
282	>	* verify that operations block or time out.
283	>	*/
284	>	long timeoutMillis() {
285	>	return SHORT_DELAY_MS / 4;
286	>	}
287	>
288	>	/**
289	>	* Returns a new Date instance representing a time delayMillis
290	>	* milliseconds in the future.
291	>	*/
292	>	Date delayedDate(long delayMillis) {
293	>	return new Date(System.currentTimeMillis() + delayMillis);
294		}
295
296		/**
#	Line 283 | Line 314 | public class JSR166TestCase extends Test
314		}
315
316		/**
317	+	* Extra checks that get done for all test cases.
318	+	*
319		* Triggers test case failure if any thread assertions have failed,
320		* by rethrowing, in the test harness thread, any exception recorded
321		* earlier by threadRecordFailure.
322	+	*
323	+	* Triggers test case failure if interrupt status is set in the main thread.
324		*/
325		public void tearDown() throws Exception {
326	<	Throwable t = threadFailure.get();
326	>	Throwable t = threadFailure.getAndSet(null);
327		if (t != null) {
328		if (t instanceof Error)
329		throw (Error) t;
#	Line 303 | Line 338 | public class JSR166TestCase extends Test
338		throw afe;
339		}
340		}
341	+
342	+	if (Thread.interrupted())
343	+	throw new AssertionFailedError("interrupt status set in main thread");
344		}
345
346		/**
#	Line 434 | Line 472 | public class JSR166TestCase extends Test
472		else {
473		AssertionFailedError afe =
474		new AssertionFailedError("unexpected exception: " + t);
475	<	t.initCause(t);
475	>	afe.initCause(t);
476		throw afe;
477		}
478		}
479
480		/**
481	+	* Delays, via Thread.sleep, for the given millisecond delay, but
482	+	* if the sleep is shorter than specified, may re-sleep or yield
483	+	* until time elapses.
484	+	*/
485	+	static void delay(long millis) throws InterruptedException {
486	+	long startTime = System.nanoTime();
487	+	long ns = millis * 1000 * 1000;
488	+	for (;;) {
489	+	if (millis > 0L)
490	+	Thread.sleep(millis);
491	+	else // too short to sleep
492	+	Thread.yield();
493	+	long d = ns - (System.nanoTime() - startTime);
494	+	if (d > 0L)
495	+	millis = d / (1000 * 1000);
496	+	else
497	+	break;
498	+	}
499	+	}
500	+
501	+	/**
502		* Waits out termination of a thread pool or fails doing so.
503		*/
504	<	public void joinPool(ExecutorService exec) {
504	>	void joinPool(ExecutorService exec) {
505		try {
506		exec.shutdown();
507		assertTrue("ExecutorService did not terminate in a timely manner",
508	<	exec.awaitTermination(LONG_DELAY_MS, MILLISECONDS));
508	>	exec.awaitTermination(2 * LONG_DELAY_MS, MILLISECONDS));
509		} catch (SecurityException ok) {
510		// Allowed in case test doesn't have privs
511		} catch (InterruptedException ie) {
#	Line 454 | Line 513 | public class JSR166TestCase extends Test
513		}
514		}
515
516	+	/**
517	+	* A debugging tool to print all stack traces, as jstack does.
518	+	*/
519	+	static void printAllStackTraces() {
520	+	for (ThreadInfo info :
521	+	ManagementFactory.getThreadMXBean()
522	+	.dumpAllThreads(true, true))
523	+	System.err.print(info);
524	+	}
525	+
526	+	/**
527	+	* Checks that thread does not terminate within the default
528	+	* millisecond delay of {@code timeoutMillis()}.
529	+	*/
530	+	void assertThreadStaysAlive(Thread thread) {
531	+	assertThreadStaysAlive(thread, timeoutMillis());
532	+	}
533	+
534	+	/**
535	+	* Checks that thread does not terminate within the given millisecond delay.
536	+	*/
537	+	void assertThreadStaysAlive(Thread thread, long millis) {
538	+	try {
539	+	// No need to optimize the failing case via Thread.join.
540	+	delay(millis);
541	+	assertTrue(thread.isAlive());
542	+	} catch (InterruptedException ie) {
543	+	fail("Unexpected InterruptedException");
544	+	}
545	+	}
546	+
547	+	/**
548	+	* Checks that the threads do not terminate within the default
549	+	* millisecond delay of {@code timeoutMillis()}.
550	+	*/
551	+	void assertThreadsStayAlive(Thread... threads) {
552	+	assertThreadsStayAlive(timeoutMillis(), threads);
553	+	}
554	+
555	+	/**
556	+	* Checks that the threads do not terminate within the given millisecond delay.
557	+	*/
558	+	void assertThreadsStayAlive(long millis, Thread... threads) {
559	+	try {
560	+	// No need to optimize the failing case via Thread.join.
561	+	delay(millis);
562	+	for (Thread thread : threads)
563	+	assertTrue(thread.isAlive());
564	+	} catch (InterruptedException ie) {
565	+	fail("Unexpected InterruptedException");
566	+	}
567	+	}
568	+
569	+	/**
570	+	* Checks that future.get times out, with the default timeout of
571	+	* {@code timeoutMillis()}.
572	+	*/
573	+	void assertFutureTimesOut(Future future) {
574	+	assertFutureTimesOut(future, timeoutMillis());
575	+	}
576	+
577	+	/**
578	+	* Checks that future.get times out, with the given millisecond timeout.
579	+	*/
580	+	void assertFutureTimesOut(Future future, long timeoutMillis) {
581	+	long startTime = System.nanoTime();
582	+	try {
583	+	future.get(timeoutMillis, MILLISECONDS);
584	+	shouldThrow();
585	+	} catch (TimeoutException success) {
586	+	} catch (Exception e) {
587	+	threadUnexpectedException(e);
588	+	} finally { future.cancel(true); }
589	+	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
590	+	}
591
592		/**
593		* Fails with message "should throw exception".
#	Line 506 | Line 640 | public class JSR166TestCase extends Test
640		SecurityManager sm = System.getSecurityManager();
641		if (sm == null) {
642		r.run();
643	+	}
644	+	runWithSecurityManagerWithPermissions(r, permissions);
645	+	}
646	+
647	+	/**
648	+	* Runs Runnable r with a security policy that permits precisely
649	+	* the specified permissions.  If there is no current security
650	+	* manager, a temporary one is set for the duration of the
651	+	* Runnable.  We require that any security manager permit
652	+	* getPolicy/setPolicy.
653	+	*/
654	+	public void runWithSecurityManagerWithPermissions(Runnable r,
655	+	Permission... permissions) {
656	+	SecurityManager sm = System.getSecurityManager();
657	+	if (sm == null) {
658		Policy savedPolicy = Policy.getPolicy();
659		try {
660		Policy.setPolicy(permissivePolicy());
661		System.setSecurityManager(new SecurityManager());
662	<	runWithPermissions(r, permissions);
662	>	runWithSecurityManagerWithPermissions(r, permissions);
663		} finally {
664		System.setSecurityManager(null);
665		Policy.setPolicy(savedPolicy);
#	Line 558 | Line 707 | public class JSR166TestCase extends Test
707		return perms.implies(p);
708		}
709		public void refresh() {}
710	+	public String toString() {
711	+	List<Permission> ps = new ArrayList<Permission>();
712	+	for (Enumeration<Permission> e = perms.elements(); e.hasMoreElements();)
713	+	ps.add(e.nextElement());
714	+	return "AdjustablePolicy with permissions " + ps;
715	+	}
716		}
717
718		/**
#	Line 585 | Line 740 | public class JSR166TestCase extends Test
740		*/
741		void sleep(long millis) {
742		try {
743	<	Thread.sleep(millis);
743	>	delay(millis);
744		} catch (InterruptedException ie) {
745		AssertionFailedError afe =
746		new AssertionFailedError("Unexpected InterruptedException");
#	Line 595 | Line 750 | public class JSR166TestCase extends Test
750		}
751
752		/**
753	<	* Sleeps until the timeout has elapsed, or interrupted.
754	<	* Does <em>NOT</em> throw InterruptedException.
753	>	* Spin-waits up to the specified number of milliseconds for the given
754	>	* thread to enter a wait state: BLOCKED, WAITING, or TIMED_WAITING.
755		*/
756	<	void sleepTillInterrupted(long timeoutMillis) {
757	<	try {
758	<	Thread.sleep(timeoutMillis);
759	<	} catch (InterruptedException wakeup) {}
756	>	void waitForThreadToEnterWaitState(Thread thread, long timeoutMillis) {
757	>	long startTime = System.nanoTime();
758	>	for (;;) {
759	>	Thread.State s = thread.getState();
760	>	if (s == Thread.State.BLOCKED ||
761	>	s == Thread.State.WAITING ||
762	>	s == Thread.State.TIMED_WAITING)
763	>	return;
764	>	else if (s == Thread.State.TERMINATED)
765	>	fail("Unexpected thread termination");
766	>	else if (millisElapsedSince(startTime) > timeoutMillis) {
767	>	threadAssertTrue(thread.isAlive());
768	>	return;
769	>	}
770	>	Thread.yield();
771	>	}
772	>	}
773	>
774	>	/**
775	>	* Waits up to LONG_DELAY_MS for the given thread to enter a wait
776	>	* state: BLOCKED, WAITING, or TIMED_WAITING.
777	>	*/
778	>	void waitForThreadToEnterWaitState(Thread thread) {
779	>	waitForThreadToEnterWaitState(thread, LONG_DELAY_MS);
780	>	}
781	>
782	>	/**
783	>	* Returns the number of milliseconds since time given by
784	>	* startNanoTime, which must have been previously returned from a
785	>	* call to {@link System.nanoTime()}.
786	>	*/
787	>	long millisElapsedSince(long startNanoTime) {
788	>	return NANOSECONDS.toMillis(System.nanoTime() - startNanoTime);
789		}
790
791		/**
#	Line 625 | Line 809 | public class JSR166TestCase extends Test
809		} catch (InterruptedException ie) {
810		threadUnexpectedException(ie);
811		} finally {
812	<	if (t.isAlive()) {
812	>	if (t.getState() != Thread.State.TERMINATED) {
813		t.interrupt();
814		fail("Test timed out");
815		}
816		}
817		}
818
819	+	/**
820	+	* Waits for LONG_DELAY_MS milliseconds for the thread to
821	+	* terminate (using {@link Thread#join(long)}), else interrupts
822	+	* the thread (in the hope that it may terminate later) and fails.
823	+	*/
824	+	void awaitTermination(Thread t) {
825	+	awaitTermination(t, LONG_DELAY_MS);
826	+	}
827	+
828		// Some convenient Runnable classes
829
830		public abstract class CheckedRunnable implements Runnable {
#	Line 694 | Line 887 | public class JSR166TestCase extends Test
887		realRun();
888		threadShouldThrow("InterruptedException");
889		} catch (InterruptedException success) {
890	+	threadAssertFalse(Thread.interrupted());
891		} catch (Throwable t) {
892		threadUnexpectedException(t);
893		}
#	Line 723 | Line 917 | public class JSR166TestCase extends Test
917		threadShouldThrow("InterruptedException");
918		return result;
919		} catch (InterruptedException success) {
920	+	threadAssertFalse(Thread.interrupted());
921		} catch (Throwable t) {
922		threadUnexpectedException(t);
923		}
#	Line 746 | Line 941 | public class JSR166TestCase extends Test
941
942		public Callable<String> latchAwaitingStringTask(final CountDownLatch latch) {
943		return new CheckedCallable<String>() {
944	<	public String realCall() {
944	>	protected String realCall() {
945		try {
946		latch.await();
947		} catch (InterruptedException quittingTime) {}
#	Line 754 | Line 949 | public class JSR166TestCase extends Test
949		}};
950		}
951
952	+	public Runnable awaiter(final CountDownLatch latch) {
953	+	return new CheckedRunnable() {
954	+	public void realRun() throws InterruptedException {
955	+	await(latch);
956	+	}};
957	+	}
958	+
959	+	public void await(CountDownLatch latch) {
960	+	try {
961	+	assertTrue(latch.await(LONG_DELAY_MS, MILLISECONDS));
962	+	} catch (Throwable t) {
963	+	threadUnexpectedException(t);
964	+	}
965	+	}
966	+
967	+	public void await(Semaphore semaphore) {
968	+	try {
969	+	assertTrue(semaphore.tryAcquire(LONG_DELAY_MS, MILLISECONDS));
970	+	} catch (Throwable t) {
971	+	threadUnexpectedException(t);
972	+	}
973	+	}
974	+
975	+	//     /**
976	+	//      * Spin-waits up to LONG_DELAY_MS until flag becomes true.
977	+	//      */
978	+	//     public void await(AtomicBoolean flag) {
979	+	//         await(flag, LONG_DELAY_MS);
980	+	//     }
981	+
982	+	//     /**
983	+	//      * Spin-waits up to the specified timeout until flag becomes true.
984	+	//      */
985	+	//     public void await(AtomicBoolean flag, long timeoutMillis) {
986	+	//         long startTime = System.nanoTime();
987	+	//         while (!flag.get()) {
988	+	//             if (millisElapsedSince(startTime) > timeoutMillis)
989	+	//                 throw new AssertionFailedError("timed out");
990	+	//             Thread.yield();
991	+	//         }
992	+	//     }
993	+
994		public static class NPETask implements Callable<String> {
995		public String call() { throw new NullPointerException(); }
996		}
#	Line 764 | Line 1001 | public class JSR166TestCase extends Test
1001
1002		public class ShortRunnable extends CheckedRunnable {
1003		protected void realRun() throws Throwable {
1004	<	Thread.sleep(SHORT_DELAY_MS);
1004	>	delay(SHORT_DELAY_MS);
1005		}
1006		}
1007
1008		public class ShortInterruptedRunnable extends CheckedInterruptedRunnable {
1009		protected void realRun() throws InterruptedException {
1010	<	Thread.sleep(SHORT_DELAY_MS);
1010	>	delay(SHORT_DELAY_MS);
1011		}
1012		}
1013
1014		public class SmallRunnable extends CheckedRunnable {
1015		protected void realRun() throws Throwable {
1016	<	Thread.sleep(SMALL_DELAY_MS);
1016	>	delay(SMALL_DELAY_MS);
1017		}
1018		}
1019
1020		public class SmallPossiblyInterruptedRunnable extends CheckedRunnable {
1021		protected void realRun() {
1022		try {
1023	<	Thread.sleep(SMALL_DELAY_MS);
1023	>	delay(SMALL_DELAY_MS);
1024		} catch (InterruptedException ok) {}
1025		}
1026		}
1027
1028		public class SmallCallable extends CheckedCallable {
1029		protected Object realCall() throws InterruptedException {
1030	<	Thread.sleep(SMALL_DELAY_MS);
1030	>	delay(SMALL_DELAY_MS);
1031		return Boolean.TRUE;
1032		}
1033		}
1034
1035		public class MediumRunnable extends CheckedRunnable {
1036		protected void realRun() throws Throwable {
1037	<	Thread.sleep(MEDIUM_DELAY_MS);
1037	>	delay(MEDIUM_DELAY_MS);
1038		}
1039		}
1040
1041		public class MediumInterruptedRunnable extends CheckedInterruptedRunnable {
1042		protected void realRun() throws InterruptedException {
1043	<	Thread.sleep(MEDIUM_DELAY_MS);
1043	>	delay(MEDIUM_DELAY_MS);
1044		}
1045		}
1046
1047	+	public Runnable possiblyInterruptedRunnable(final long timeoutMillis) {
1048	+	return new CheckedRunnable() {
1049	+	protected void realRun() {
1050	+	try {
1051	+	delay(timeoutMillis);
1052	+	} catch (InterruptedException ok) {}
1053	+	}};
1054	+	}
1055	+
1056		public class MediumPossiblyInterruptedRunnable extends CheckedRunnable {
1057		protected void realRun() {
1058		try {
1059	<	Thread.sleep(MEDIUM_DELAY_MS);
1059	>	delay(MEDIUM_DELAY_MS);
1060		} catch (InterruptedException ok) {}
1061		}
1062		}
#	Line 818 | Line 1064 | public class JSR166TestCase extends Test
1064		public class LongPossiblyInterruptedRunnable extends CheckedRunnable {
1065		protected void realRun() {
1066		try {
1067	<	Thread.sleep(LONG_DELAY_MS);
1067	>	delay(LONG_DELAY_MS);
1068		} catch (InterruptedException ok) {}
1069		}
1070		}
#	Line 842 | Line 1088 | public class JSR166TestCase extends Test
1088		public boolean isDone() { return done; }
1089		public void run() {
1090		try {
1091	<	Thread.sleep(timeoutMillis);
1091	>	delay(timeoutMillis);
1092		done = true;
1093		} catch (InterruptedException ok) {}
1094		}
#	Line 853 | Line 1099 | public class JSR166TestCase extends Test
1099		public volatile boolean done = false;
1100		public void run() {
1101		try {
1102	<	Thread.sleep(SHORT_DELAY_MS);
1102	>	delay(SHORT_DELAY_MS);
1103		done = true;
1104		} catch (InterruptedException ok) {}
1105		}
#	Line 863 | Line 1109 | public class JSR166TestCase extends Test
1109		public volatile boolean done = false;
1110		public void run() {
1111		try {
1112	<	Thread.sleep(SMALL_DELAY_MS);
1112	>	delay(SMALL_DELAY_MS);
1113		done = true;
1114		} catch (InterruptedException ok) {}
1115		}
#	Line 873 | Line 1119 | public class JSR166TestCase extends Test
1119		public volatile boolean done = false;
1120		public void run() {
1121		try {
1122	<	Thread.sleep(MEDIUM_DELAY_MS);
1122	>	delay(MEDIUM_DELAY_MS);
1123		done = true;
1124		} catch (InterruptedException ok) {}
1125		}
#	Line 883 | Line 1129 | public class JSR166TestCase extends Test
1129		public volatile boolean done = false;
1130		public void run() {
1131		try {
1132	<	Thread.sleep(LONG_DELAY_MS);
1132	>	delay(LONG_DELAY_MS);
1133		done = true;
1134		} catch (InterruptedException ok) {}
1135		}
#	Line 900 | Line 1146 | public class JSR166TestCase extends Test
1146		public volatile boolean done = false;
1147		public Object call() {
1148		try {
1149	<	Thread.sleep(SMALL_DELAY_MS);
1149	>	delay(SMALL_DELAY_MS);
1150		done = true;
1151		} catch (InterruptedException ok) {}
1152		return Boolean.TRUE;
#	Line 947 | Line 1193 | public class JSR166TestCase extends Test
1193		}
1194
1195		/**
1196	<	* A CyclicBarrier that fails with AssertionFailedErrors instead
1197	<	* of throwing checked exceptions.
1196	>	* A CyclicBarrier that uses timed await and fails with
1197	>	* AssertionFailedErrors instead of throwing checked exceptions.
1198		*/
1199		public class CheckedBarrier extends CyclicBarrier {
1200		public CheckedBarrier(int parties) { super(parties); }
1201
1202		public int await() {
1203		try {
1204	<	return super.await();
1204	>	return super.await(2 * LONG_DELAY_MS, MILLISECONDS);
1205	>	} catch (TimeoutException e) {
1206	>	throw new AssertionFailedError("timed out");
1207		} catch (Exception e) {
1208		AssertionFailedError afe =
1209		new AssertionFailedError("Unexpected exception: " + e);
#	Line 965 | Line 1213 | public class JSR166TestCase extends Test
1213		}
1214		}
1215
1216	+	void checkEmpty(BlockingQueue q) {
1217	+	try {
1218	+	assertTrue(q.isEmpty());
1219	+	assertEquals(0, q.size());
1220	+	assertNull(q.peek());
1221	+	assertNull(q.poll());
1222	+	assertNull(q.poll(0, MILLISECONDS));
1223	+	assertEquals(q.toString(), "[]");
1224	+	assertTrue(Arrays.equals(q.toArray(), new Object[0]));
1225	+	assertFalse(q.iterator().hasNext());
1226	+	try {
1227	+	q.element();
1228	+	shouldThrow();
1229	+	} catch (NoSuchElementException success) {}
1230	+	try {
1231	+	q.iterator().next();
1232	+	shouldThrow();
1233	+	} catch (NoSuchElementException success) {}
1234	+	try {
1235	+	q.remove();
1236	+	shouldThrow();
1237	+	} catch (NoSuchElementException success) {}
1238	+	} catch (InterruptedException ie) {
1239	+	threadUnexpectedException(ie);
1240	+	}
1241	+	}
1242	+
1243	+	void assertSerialEquals(Object x, Object y) {
1244	+	assertTrue(Arrays.equals(serialBytes(x), serialBytes(y)));
1245	+	}
1246	+
1247	+	void assertNotSerialEquals(Object x, Object y) {
1248	+	assertFalse(Arrays.equals(serialBytes(x), serialBytes(y)));
1249	+	}
1250	+
1251	+	byte[] serialBytes(Object o) {
1252	+	try {
1253	+	ByteArrayOutputStream bos = new ByteArrayOutputStream();
1254	+	ObjectOutputStream oos = new ObjectOutputStream(bos);
1255	+	oos.writeObject(o);
1256	+	oos.flush();
1257	+	oos.close();
1258	+	return bos.toByteArray();
1259	+	} catch (Throwable t) {
1260	+	threadUnexpectedException(t);
1261	+	return new byte[0];
1262	+	}
1263	+	}
1264	+
1265	+	@SuppressWarnings("unchecked")
1266	+	<T> T serialClone(T o) {
1267	+	try {
1268	+	ObjectInputStream ois = new ObjectInputStream
1269	+	(new ByteArrayInputStream(serialBytes(o)));
1270	+	T clone = (T) ois.readObject();
1271	+	assertSame(o.getClass(), clone.getClass());
1272	+	return clone;
1273	+	} catch (Throwable t) {
1274	+	threadUnexpectedException(t);
1275	+	return null;
1276	+	}
1277	+	}
1278		}

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