visualvm Fails to show VisualGC for ZGC

Describe the bug When running a large java app using the ZGC garbage collector, the VisualVM tab VisualGC falsely claims it doesn't support the running JVM (whereas actually, it's the chosen GC that represents a problem).

To Reproduce Steps to reproduce the behavior: 1 Start VisualVM 2 Start a JVM app using the commandline option -XX+UseZGC 3 Find the newly started app in VisualVM and click the VisualGC tab 4 See error

Expected behavior A very nice graphical representation of the current state of the memory use should be displayed

VisualVM log INFO [com.sun.jvmstat.tools.visualgc.VisualGCView]: Could not create GCSample java.lang.NullPointerException: Cannot invoke "sun.jvmstat.monitor.LongMonitor.longValue()" because "this.edenSize" is null at com.sun.jvmstat.tools.visualgc.MonitoredVmModel.getNewGenMaxSize(MonitoredVmModel.java:250) at com.sun.jvmstat.tools.visualgc.GCSample.(GCSample.java:131) [catch] at com.sun.jvmstat.tools.visualgc.VisualGCView.initializeModel(VisualGCView.java:218) at com.sun.jvmstat.tools.visualgc.VisualGCView.(VisualGCView.java:103) at org.graalvm.visualvm.modules.visualgc.VisualGCViewProvider.createView(VisualGCViewProvider.java:26) at org.graalvm.visualvm.modules.visualgc.VisualGCViewProvider.createView(VisualGCViewProvider.java:19) at org.graalvm.visualvm.core.ui.DataSourceViewProvider.getView(DataSourceViewProvider.java:103) at org.graalvm.visualvm.core.ui.DataSourceViewsManager.getViews(DataSourceViewsManager.java:137) at org.graalvm.visualvm.core.ui.DataSourceWindowManager.openWindowAndAddView(DataSourceWindowManager.java:263) at org.graalvm.visualvm.core.ui.DataSourceWindowManager.access$000(DataSourceWindowManager.java:53) at org.graalvm.visualvm.core.ui.DataSourceWindowManager$2.run(DataSourceWindowManager.java:122) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418) at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45) at org.openide.util.lookup.Lookups.executeWith(Lookups.java:278) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)

Desktop (please complete the following information):

OS: Ubuntu 20.10 and Ubuntu 20.04
JDK version JDK 15
VisualVM version 2.0.5

Additional context Very cold weather today

Jan 08 '21 11:01 hallyhaa

encountered the same problem，with environment ： 1. window 10 ；2.JDK version JDK 15；3.VisualVM version 2.0.6 。 everything was ok ,and visual GC plugins worked well .But when i use ZGC by add VM options “-XX:+UnlockExperimentalVMOptions -XX:+UseZGC -XX:ConcGCThreads=1” ，i meet the problem like @hallyhaa

Mar 24 '21 11:03 ZhangDi-d

+1

Apr 28 '22 01:04 KyongSik-Yoon

Visual VM 2.1.5 still does not work.

Nov 18 '22 17:11 sgtcortez