Hi, seems with the change for
8198253: ThreadInfo.from(CompositeData) incorrectly accepts CompositeData with missing JDK 6 attributes ThreadInfoCompositeData.compositeType() was broken. It just returns public static CompositeType compositeType() { return ThreadInfoCompositeTypes.compositeTypes.get(0); } while ThreadInfoCompositeTypes.compositeTypes consists of types.put(CURRENT, ctype); types.put(5, initV5CompositeType(ctype)); types.put(6, initV6CompositeType(ctype)); so that compositeType just returns null, which further down the stack leads to java.lang.reflect.InvocationTargetException at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at org.netbeans.modules.sampler.SamplesOutputStream.toCompositeData(SamplesOutputStream.java:178) at org.netbeans.modules.sampler.SamplesOutputStream.access$400(SamplesOutputStream.java:44) at org.netbeans.modules.sampler.SamplesOutputStream$Sample.writeToStream(SamplesOutputStream.java:285) at org.netbeans.modules.sampler.SamplesOutputStream$Sample.access$300(SamplesOutputStream.java:253) at org.netbeans.modules.sampler.SamplesOutputStream.close(SamplesOutputStream.java:202) at org.netbeans.modules.sampler.Sampler.stopSampling(Sampler.java:231) at org.netbeans.modules.sampler.Sampler.stop(Sampler.java:207) at org.netbeans.core.ui.sampler.SelfSamplerAction$1.doInBackground(SelfSamplerAction.java:90) at java.desktop/javax.swing.SwingWorker$1.call(SwingWorker.java:304) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.desktop/javax.swing.SwingWorker.run(SwingWorker.java:343) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.lang.Thread.run(Thread.java:835)xx Caused by: java.lang.IllegalArgumentException: Argument compositeType cannot be null. at java.management/javax.management.openmbean.CompositeDataSupport.<init>(CompositeDataSupport.java:206) at java.management/javax.management.openmbean.CompositeDataSupport.<init>(CompositeDataSupport.java:118) at java.management/sun.management.ThreadInfoCompositeData.getCompositeData(ThreadInfoCompositeData.java:130) at java.management/sun.management.ThreadInfoCompositeData.toCompositeData(ThreadInfoCompositeData.java:72) ... 18 more See also latest comments on NETBEANS-1359 <https://issues.apache.org/jira/browse/NETBEANS-1359?focusedCommentId=16658301&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16658301> . Thanks for investigating. -Sven