NPE in startVisualVM

[henryem]

The exception reported by IntelliJ is below. I don't know exactly what triggered it, but:

• It happened after running a ScalaTest test suite several times using the Run With VisualVM button in the top toolbar in IntelliJ.
• The Run With VisualVM button was greyed out.
• I hadn't seen this before.
• I upgraded today to IntelliJ 2021.1.1.

Not a big deal, just thought it was worth reporting.

java.lang.NullPointerException
	at krasa.visualvm.integration.VisualVMHelper.startVisualVM(VisualVMHelper.java:57)
	at krasa.visualvm.runner.RunnerUtils.runVisualVM(RunnerUtils.java:35)
	at krasa.visualvm.runner.RunVisualVMRunner.doExecute(RunVisualVMRunner.java:73)
	at com.intellij.execution.impl.DefaultJavaProgramRunner.lambda$execute$1(DefaultJavaProgramRunner.java:113)
	at com.intellij.util.SlowOperations.allowSlowOperations(SlowOperations.java:64)
	at com.intellij.execution.impl.DefaultJavaProgramRunner.lambda$execute$2(DefaultJavaProgramRunner.java:112)
	at com.intellij.execution.ExecutionManager$startRunProfile$1.invoke(ExecutionManager.kt:65)
	at com.intellij.execution.ExecutionManager$startRunProfile$1.invoke(ExecutionManager.kt:19)
	at com.intellij.execution.impl.ExecutionManagerImpl$startRunProfile$1.invoke(ExecutionManagerImpl.kt:168)
	at com.intellij.execution.impl.ExecutionManagerImpl$startRunProfile$1.invoke(ExecutionManagerImpl.kt:68)
	at com.intellij.execution.impl.ExecutionManagerImpl$doStartRunProfile$startRunnable$1.run(ExecutionManagerImpl.kt:229)
	at com.intellij.openapi.application.TransactionGuardImpl.runWithWritingAllowed(TransactionGuardImpl.java:218)
	at com.intellij.openapi.application.TransactionGuardImpl.access$200(TransactionGuardImpl.java:21)
	at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:200)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:781)
	at com.intellij.openapi.application.impl.ApplicationImpl.lambda$invokeLater$4(ApplicationImpl.java:319)
	at com.intellij.openapi.application.impl.FlushQueue.doRun(FlushQueue.java:84)
	at com.intellij.openapi.application.impl.FlushQueue.runNextEvent(FlushQueue.java:133)
	at com.intellij.openapi.application.impl.FlushQueue.flushNow(FlushQueue.java:46)
	at com.intellij.openapi.application.impl.FlushQueue$FlushNow.run(FlushQueue.java:189)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:776)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:727)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:746)
	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:969)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:839)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$8(IdeEventQueue.java:449)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:808)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$9(IdeEventQueue.java:448)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:781)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:496)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

[krasa]

Thanks! I fixed the NPE, but some deeper issue is behind that.

Graying out is normal IDE behaviour