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8373945: Use WB.fullGC() in ClassUnloader.unloadClass to force GC for vmTestbase tests #199

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8373945: Use WB.fullGC() in ClassUnloader.unloadClass to force GC for vmTestbase tests #199

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352d864
Backport ce5e0d8a48296b51c9c2eff4867e2a9a70194091
Jan 15, 2026
c9875bc
8375485: Tests in vmTestbase/nsk are failing due to missing class unl…
Jan 21, 2026
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30 changes: 11 additions & 19 deletions test/hotspot/jtreg/vmTestbase/gc/gctests/LargeObjects/large001/large001.java
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Original file line number Diff line number Diff line change
@@ -1,9 +1,5 @@
/*
* Copyright (c) 2004, 2024, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* Copyright (c) 2004, 2026, Oracle and/or its affiliates. All rights reserved.
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
Expand Down Expand Up @@ -46,9 +42,8 @@
* generated by nsk.share.gc.Generator (see its javadoc for more details).
* Each class has a huge number of fields, but this number is less than the JVM
* limitation.
* The test loads the classes with nsk.share.gc.GCClassUnloader class that
* extends nsk.share.ClassUnloader and has a bit different algorith of eating
* heap. As soon as a class is loaded, the test creates an instance of
* The test loads the classes with nsk.share.gc.GCClassUnloader class.
* As soon as a class is loaded, the test creates an instance of
* it - allocates an object of that type. Then it drops references to the
* class and to the instance and tries to unload the class. The test does not
* expect any exceptions to be thrown.
Expand All @@ -57,10 +52,13 @@
* /test/lib
*
* @comment generate and compile nsk.share.gc.newclass.* classes
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @run driver nsk.share.gc.GenClassesBuilder
*
* @run main/othervm/timeout=300
* -XX:-UseGCOverheadLimit
* -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
* -Xlog:gc*
* gc.gctests.LargeObjects.large001.large001
* -largeClassesPath classes
Expand All @@ -79,6 +77,7 @@

import nsk.share.gc.*;
import nsk.share.*;
import jdk.test.whitebox.WhiteBox;

public class large001 extends ThreadedGCTest {

Expand Down Expand Up @@ -146,8 +145,8 @@ public void run() {
List<WeakReference> refs = new ArrayList<WeakReference>(depth);
addObjRef(loadedClassInstance, loadedClass, depth, refs);

// Drop all references to the class and try to unload it
Algorithms.eatMemory(getExecutionController());
// Keep all references to the class and try to unload it
WhiteBox.getWhiteBox().fullGC();
log.debug(id + ": Testing non-null after GC force for: " + name);
if (loadedClass == null || loadedClassInstance == null) {
throw new Exception("Null class");
Expand All @@ -158,21 +157,14 @@ public void run() {
throw new Exception("Unexpected null reference");
}
}
// Drop all references to the class and try to unload it
refs = null;
loadedClass = null;
loadedClassInstance = null;

log.debug(id + ": Unloading class: "
+ name);
boolean result = unloader.unloadClass(getExecutionController());
log.debug(id + ": Result of uloading "
+ "class " + name + ": " + result);
}
} catch (OutOfMemoryError oome) {
// just skip if we eat memory in several threads...
// rethrow in the case of one thread
if (runParams.getNumberOfThreads() == 1) {
throw oome;
WhiteBox.getWhiteBox().fullGC();
}
} catch (Throwable t) {
throw new TestFailure("Unexpected exception: ", t);
Expand Down
10 changes: 6 additions & 4 deletions test/hotspot/jtreg/vmTestbase/gc/gctests/LargeObjects/large002/TestDescription.java
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2017, 2024, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2017, 2026, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
Expand Down Expand Up @@ -47,9 +47,8 @@
* generated by nsk.share.gc.Generator (see its javadoc for more details).
* Each class has a huge number of fields, and the number of fields is more than
* the JVM limitation.
* The test loads the classes with nsk.share.gc.GCClassUnloader class that
* extends nsk.share.ClassUnloader and has a bit different algorith of eating
* heap. As soon as a class is loaded, the test creates an instance of
* The test loads the classes with nsk.share.gc.GCClassUnloader class.
* As soon as a class is loaded, the test creates an instance of
* it - allocates an object of that type. Then it drops references to the
* class and to the instance and tries to unload the class. The test does not
* expect any exceptions to be thrown.
Expand All @@ -58,10 +57,13 @@
* /test/lib
*
* @comment generate and compile nsk.share.gc.newclass.* classes
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @run driver nsk.share.gc.GenClassesBuilder
*
* @run main/othervm/timeout=300
* -XX:-UseGCOverheadLimit
* -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
* gc.gctests.LargeObjects.large001.large001
* -largeClassesPath classes
* -isOverLimitFields true
Expand Down
10 changes: 6 additions & 4 deletions test/hotspot/jtreg/vmTestbase/gc/gctests/LargeObjects/large003/TestDescription.java
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2017, 2024, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2017, 2026, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
Expand Down Expand Up @@ -47,9 +47,8 @@
* generated by nsk.share.gc.Generator (see its javadoc for more details).
* Each class has a huge number of fields, but this number is less than the JVM
* limitation.
* The test loads the classes with nsk.share.gc.GCClassUnloader class that
* extends nsk.share.ClassUnloader and has a bit different algorith of eating
* heap. As soon as a class is loaded, the test creates an instance of
* The test loads the classes with nsk.share.gc.GCClassUnloader class.
* As soon as a class is loaded, the test creates an instance of
* it - allocates an object of that type. Then it drops references to the
* class and to the instance and tries to unload the class. The test does not
* expect any exceptions to be thrown.
Expand All @@ -62,10 +61,13 @@
* /test/lib
*
* @comment generate and compile nsk.share.gc.newclass.* classes
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @run driver nsk.share.gc.GenClassesBuilder
*
* @run main/othervm/timeout=300
* -XX:-UseGCOverheadLimit
* -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
* gc.gctests.LargeObjects.large001.large001
* -largeClassesPath classes
* -isOverLimitFields false
Expand Down
10 changes: 6 additions & 4 deletions test/hotspot/jtreg/vmTestbase/gc/gctests/LargeObjects/large004/TestDescription.java
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* Copyright (c) 2017, 2024, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2017, 2026, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
Expand Down Expand Up @@ -47,9 +47,8 @@
* generated by nsk.share.gc.Generator (see its javadoc for more details).
* Each class has a huge number of fields, but this number is less than the JVM
* limitation.
* The test loads the classes with nsk.share.gc.GCClassUnloader class that
* extends nsk.share.ClassUnloader and has a bit different algorith of eating
* heap. As soon as a class is loaded, the test creates an instance of
* The test loads the classes with nsk.share.gc.GCClassUnloader class.
* As soon as a class is loaded, the test creates an instance of
* it - allocates an object of that type. Then it drops references to the
* class and to the instance and tries to unload the class. The test does not
* expect any exceptions to be thrown.
Expand All @@ -62,10 +61,13 @@
* /test/lib
*
* @comment generate and compile nsk.share.gc.newclass.* classes
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @run driver nsk.share.gc.GenClassesBuilder
*
* @run main/othervm/timeout=300
* -XX:-UseGCOverheadLimit
* -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
* gc.gctests.LargeObjects.large001.large001
* -largeClassesPath classes
* -isOverLimitFields true
Expand Down
10 changes: 6 additions & 4 deletions test/hotspot/jtreg/vmTestbase/gc/gctests/LargeObjects/large005/TestDescription.java
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* Copyright (c) 2017, 2024, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2017, 2026, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
Expand Down Expand Up @@ -47,9 +47,8 @@
* generated by nsk.share.gc.Generator (see its javadoc for more details).
* Each class has a huge number of fields, but this number is less than the JVM
* limitation.
* The test loads the classes with nsk.share.gc.GCClassUnloader class that
* extends nsk.share.ClassUnloader and has a bit different algorith of eating
* heap. As soon as a class is loaded, the test creates an instance of
* The test loads the classes with nsk.share.gc.GCClassUnloader class.
* As soon as a class is loaded, the test creates an instance of
* it - allocates an object of that type. Then it drops references to the
* class and to the instance and tries to unload the class. The test does not
* expect any exceptions to be thrown.
Expand All @@ -62,10 +61,13 @@
* /test/lib
*
* @comment generate and compile nsk.share.gc.newclass.* classes
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @run driver nsk.share.gc.GenClassesBuilder
*
* @run main/othervm/timeout=300
* -XX:-UseGCOverheadLimit
* -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
* gc.gctests.LargeObjects.large001.large001
* -largeClassesPath classes
* -isOverLimitFields true
Expand Down
9 changes: 6 additions & 3 deletions .../vmTestbase/nsk/jdi/ClassObjectReference/reflectedType/reflectype002/TestDescription.java
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* Copyright (c) 2018, 2024, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2018, 2026, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
Expand Down Expand Up @@ -55,6 +55,8 @@
* nsk.jdi.ClassObjectReference.reflectedType.reflectype002a
*
* @comment compile loadclassXX to bin/loadclassXX
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @run driver nsk.share.ExtraClassesBuilder
* loadclass
*
Expand All @@ -65,6 +67,7 @@
* -waittime=5
* -debugee.vmkind=java
* -transport.address=dynamic
* -debugee.vmkeys="${test.vm.opts} ${test.java.opts}" ./bin
* -debugee.vmkeys="${test.vm.opts} ${test.java.opts} -Xbootclasspath/a:.
* -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI"
* ./bin
*/

10 changes: 6 additions & 4 deletions ...pot/jtreg/vmTestbase/nsk/jdi/ClassUnloadEvent/className/classname001/TestDescription.java
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* Copyright (c) 2018, 2024, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2018, 2026, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
Expand Down Expand Up @@ -42,7 +42,7 @@
* debugger and debugee communicates with special commands.
* The debugger forces debuggee to load checked class, creates and
* enables ClassUnloadRequest. Next, debugger forces debuggee to
* unload class, using memory stressing techique, and waits for
* unload class, using whitebox full GC techique, and waits for
* ClassUnloadEvent.
* If expected ClassUnloadEvent occurs, debugger tests method
* ClassUnloadEvent.className() and verifies that this event
Expand Down Expand Up @@ -81,6 +81,8 @@
* nsk.jdi.ClassUnloadEvent.className.classname001a
*
* @comment compile loadclassXX to bin/loadclassXX
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @run driver nsk.share.ExtraClassesBuilder
* loadclass
*
Expand All @@ -92,6 +94,6 @@
* -waittime=5
* -debugee.vmkind=java
* -transport.address=dynamic
* -debugee.vmkeys="${test.vm.opts} ${test.java.opts}"
* -debugee.vmkeys="${test.vm.opts} ${test.java.opts} -Xbootclasspath/a:.
* -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI"
*/

10 changes: 6 additions & 4 deletions ...treg/vmTestbase/nsk/jdi/ClassUnloadEvent/classSignature/signature001/TestDescription.java
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* Copyright (c) 2018, 2024, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2018, 2026, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
Expand Down Expand Up @@ -44,7 +44,7 @@
* debugger and debugee communicates with special commands.
* The debugger forces debugge to load checked classes, creates and
* enables ClassUnloadRequest. Next, debugger forces debuggee to
* unload classes, using memory stressing techique, and waits for
* unload classes, using whitebox full GC techique, and waits for
* ClassUnloadEvent.
* If each expected ClassUnloadEvent occurs, debugger tests method
* ClassUnloadEvent.classSignature() and verifies that this event
Expand Down Expand Up @@ -87,6 +87,8 @@
* nsk.jdi.ClassUnloadEvent.classSignature.signature001a
*
* @comment compile loadclassXX to bin/loadclassXX
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @run driver nsk.share.ExtraClassesBuilder
* loadclass
*
Expand All @@ -98,6 +100,6 @@
* -waittime=5
* -debugee.vmkind=java
* -transport.address=dynamic
* -debugee.vmkeys="${test.vm.opts} ${test.java.opts}"
* -debugee.vmkeys="${test.vm.opts} ${test.java.opts} -Xbootclasspath/a:.
* -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI"
*/

9 changes: 6 additions & 3 deletions ...ase/nsk/jdi/ClassUnloadRequest/addClassExclusionFilter/exclfilter001/TestDescription.java
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2018, 2026, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
Expand Down Expand Up @@ -67,6 +67,8 @@
* nsk.jdi.ClassUnloadRequest.addClassExclusionFilter.exclfilter001a
*
* @comment compile loadclassXX to bin/loadclassXX
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @run driver nsk.share.ExtraClassesBuilder
* loadclass
*
Expand All @@ -77,6 +79,7 @@
* -waittime=5
* -debugee.vmkind=java
* -transport.address=dynamic
* -debugee.vmkeys="${test.vm.opts} ${test.java.opts}" ./bin
* -debugee.vmkeys="${test.vm.opts} ${test.java.opts} -Xbootclasspath/a:.
* -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI"
* ./bin
*/

9 changes: 6 additions & 3 deletions ...jtreg/vmTestbase/nsk/jdi/ClassUnloadRequest/addClassFilter/filter001/TestDescription.java
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2018, 2026, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
Expand Down Expand Up @@ -65,6 +65,8 @@
* nsk.jdi.ClassUnloadRequest.addClassFilter.filter001a
*
* @comment compile loadclassXX to bin/loadclassXX
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @run driver nsk.share.ExtraClassesBuilder
* loadclass
*
Expand All @@ -75,6 +77,7 @@
* -waittime=5
* -debugee.vmkind=java
* -transport.address=dynamic
* -debugee.vmkeys="${test.vm.opts} ${test.java.opts}" ./bin
* -debugee.vmkeys="${test.vm.opts} ${test.java.opts} -Xbootclasspath/a:.
* -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI"
* ./bin
*/

9 changes: 6 additions & 3 deletions ...otspot/jtreg/vmTestbase/nsk/jdi/ReferenceType/allFields/allfields003/TestDescription.java
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2018, 2024, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2018, 2026, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
Expand Down Expand Up @@ -55,6 +55,8 @@
* nsk.jdi.ReferenceType.allFields.allfields003a
*
* @comment compile loadclassXX to bin/loadclassXX
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @run driver nsk.share.ExtraClassesBuilder
* loadclass
*
Expand All @@ -65,6 +67,7 @@
* -waittime=5
* -debugee.vmkind=java
* -transport.address=dynamic
* -debugee.vmkeys="${test.vm.opts} ${test.java.opts}" ./bin
* -debugee.vmkeys="${test.vm.opts} ${test.java.opts} -Xbootclasspath/a:.
* -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI"
* ./bin
*/

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