[jbosstools-issues] [JBoss JIRA] (JBIDE-20217) JDT Debug can not connect/list VM started with suspend=y

[Rob Stryker (JIRA)]

    [ https://issues.jboss.org/browse/JBIDE-20217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13090171#comment-13090171 ] 

Rob Stryker commented on JBIDE-20217:
-------------------------------------

I dug in more, and honestly, I do not believe this is a bug. 

A java process launched with suspend=y is frozen before executing, awaiting a debugger to connect. At this point, our jdt.debug plugin cannot poll the vm or ask it for details, since it has not yet truly launched.   Once the user connects a remote debugger, though, the process shows up immediately in the JMX view, the process begins executing, and everything functions as expected. 

Are there any other symptoms here that need to be addresse? It does not appear to be blowing away the stack or having any negative effect anywhere in the code.  I can look into checking that it doesn't log too often and isn't filling up the log, but other than that, I don't think this is a bug at all, and it works as I would find reasonable. 

> JDT Debug can not connect/list VM started with suspend=y
> --------------------------------------------------------
>
>                 Key: JBIDE-20217
>                 URL: https://issues.jboss.org/browse/JBIDE-20217
>             Project: Tools (JBoss Tools)
>          Issue Type: Bug
>          Components: common/jst/core
>    Affects Versions: 4.3.0.Beta1
>            Reporter: Aslak Knutsen
>            Assignee: Rob Stryker
>            Priority: Critical
>             Fix For: 4.3.0.CR1
>
>
> Having a VM started with suspend=y cause the following error to be logged from https://github.com/jbosstools/jbosstools-base/blob/master/common/plugins/org.jboss.tools.common.jdt.debug/src/org/jboss/tools/common/jdt/debug/RemoteDebugActivator.java#L171 due to Exception thrown in ToolsCore.getJvmArgs
> Seemingly JVMStat can not connect to a suspended VM. 
> {code}
> eclipse.buildId=4.5.0.I20150603-2000
> java.version=1.8.0_45
> java.vendor=Oracle Corporation
> BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
> Command-line arguments:  -os linux -ws gtk -arch x86_64
> org.jboss.tools.common.jdt.debug
> Error
> Wed Jul 08 17:16:00 CEST 2015
> {code}
> {code}
> java.lang.reflect.InvocationTargetException
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:497)
> 	at org.jboss.tools.common.jdt.debug.tools.internal.Tools.getJvmArgs(Tools.java:780)
> 	at org.jboss.tools.common.jdt.debug.tools.ToolsCore.getJvmArgs(ToolsCore.java:98)
> 	at org.jboss.tools.common.jdt.debug.RemoteDebugActivator.getVmModelsUsingTools(RemoteDebugActivator.java:166)
> 	at org.jboss.tools.common.jdt.debug.RemoteDebugActivator.getVmModel(RemoteDebugActivator.java:145)
> 	at org.jboss.tools.common.jdt.debug.RemoteDebugActivator.getVmModels(RemoteDebugActivator.java:132)
> 	at org.jboss.tools.common.jdt.debug.RemoteDebugActivator.getDebugModels(RemoteDebugActivator.java:193)
> 	at org.jboss.tools.common.jdt.debug.RemoteDebugActivator.getDebugModels(RemoteDebugActivator.java:227)
> 	at org.jboss.tools.common.jdt.debug.ui.RemoteDebugUIActivator.discoverRemoteApplication(RemoteDebugUIActivator.java:137)
> 	at org.jboss.tools.common.jdt.debug.ui.RemoteDebugUIActivator$1.run(RemoteDebugUIActivator.java:93)
> 	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
> Caused by: sun.jvmstat.monitor.MonitorException: Could not synchronize with target
> 	at sun.jvmstat.perfdata.monitor.v2_0.PerfDataBuffer.synchWithTarget(PerfDataBuffer.java:277)
> 	at sun.jvmstat.perfdata.monitor.v2_0.PerfDataBuffer.buildMonitorMap(PerfDataBuffer.java:131)
> 	at sun.jvmstat.perfdata.monitor.PerfDataBufferImpl.findByName(PerfDataBufferImpl.java:241)
> 	at sun.jvmstat.perfdata.monitor.AbstractPerfDataBuffer.findByName(AbstractPerfDataBuffer.java:100)
> 	at sun.jvmstat.perfdata.monitor.AbstractMonitoredVm.findByName(AbstractMonitoredVm.java:85)
> 	at sun.jvmstat.monitor.MonitoredVmUtil.jvmArgs(MonitoredVmUtil.java:145)
> 	... 14 more
> Root exception:
> sun.jvmstat.monitor.MonitorException: Could not synchronize with target
> 	at sun.jvmstat.perfdata.monitor.v2_0.PerfDataBuffer.synchWithTarget(PerfDataBuffer.java:277)
> 	at sun.jvmstat.perfdata.monitor.v2_0.PerfDataBuffer.buildMonitorMap(PerfDataBuffer.java:131)
> 	at sun.jvmstat.perfdata.monitor.PerfDataBufferImpl.findByName(PerfDataBufferImpl.java:241)
> 	at sun.jvmstat.perfdata.monitor.AbstractPerfDataBuffer.findByName(AbstractPerfDataBuffer.java:100)
> 	at sun.jvmstat.perfdata.monitor.AbstractMonitoredVm.findByName(AbstractMonitoredVm.java:85)
> 	at sun.jvmstat.monitor.MonitoredVmUtil.jvmArgs(MonitoredVmUtil.java:145)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:497)
> 	at org.jboss.tools.common.jdt.debug.tools.internal.Tools.getJvmArgs(Tools.java:780)
> 	at org.jboss.tools.common.jdt.debug.tools.ToolsCore.getJvmArgs(ToolsCore.java:98)
> 	at org.jboss.tools.common.jdt.debug.RemoteDebugActivator.getVmModelsUsingTools(RemoteDebugActivator.java:166)
> 	at org.jboss.tools.common.jdt.debug.RemoteDebugActivator.getVmModel(RemoteDebugActivator.java:145)
> 	at org.jboss.tools.common.jdt.debug.RemoteDebugActivator.getVmModels(RemoteDebugActivator.java:132)
> 	at org.jboss.tools.common.jdt.debug.RemoteDebugActivator.getDebugModels(RemoteDebugActivator.java:193)
> 	at org.jboss.tools.common.jdt.debug.RemoteDebugActivator.getDebugModels(RemoteDebugActivator.java:227)
> 	at org.jboss.tools.common.jdt.debug.ui.RemoteDebugUIActivator.discoverRemoteApplication(RemoteDebugUIActivator.java:137)
> 	at org.jboss.tools.common.jdt.debug.ui.RemoteDebugUIActivator$1.run(RemoteDebugUIActivator.java:93)
> 	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
> {code}



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