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Sun JDK and JVisualVM debugging AXIS2/Tomcat7
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lyallp
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Joined: 15 Jul 2004
Posts: 1253
Location: Adelaide/Australia

PostPosted: Tue Mar 13, 2012 12:54 am    Post subject: Sun JDK and JVisualVM debugging AXIS2/Tomcat7 Reply with quote

I have an AXIS2 web service which I am trying determine if it has a memory leak.

I use Sun JDK on my amd64 Gentoo system.

I have configured Tomcat7 to start with debugging enabled, by updating TOMCAT_START="jpda start" in /etc/conf.d/tomcat-7
I have Tomcat 7 running under user 'tomcat'
I run jvisualvm as root, it's easier than running as 'tomcat' and tomcat shows up in the list of local VM's
I can connect and see the heap, classes and threads, I cannot see the CPU, for some reason.
I am also unable to generate a Heap Dump (I was planning on doing a before and after).
Nor can I use memory profiling.

Any suggestions as to what is wrong?

My java config is as follows...
Code:

root@lyalls-pc /
# eselect java-vm list
Available Java Virtual Machines:
  [1]   icedtea-7
  [2]   sun-jdk-1.6  system-vm
  [3]   sun-jre-bin-1.6

root@lyalls-pc /
# java -version
java version "1.6.0_31"
Java(TM) SE Runtime Environment (build 1.6.0_31-b04)
Java HotSpot(TM) 64-Bit Server VM (build 20.6-b01, mixed mode)
root@lyalls-pc /
#


The jvisualvm log entry that I think is appropriate is
Code:
attach settings -----------------------------------
target type =
server type =
remote =false
direct =false
dynamic JDK16 =true
pid =11544
host =
host os =Linux, 64bit JVM
transient port =-1

instrumentation filter ----------------------------
  Filter type: Inclusive
  Filter value: 

Profiler.attachToApp: ***************************************************
java.lang.reflect.InvocationTargetException
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at org.netbeans.modules.profiler.NetBeansProfiler$2.loadAgentIntTargetJVM(NetBeansProfiler.java:901)
   at org.netbeans.modules.profiler.NetBeansProfiler$2.doInBackground(NetBeansProfiler.java:851)
   at org.netbeans.lib.profiler.ui.SwingWorker$2.run(SwingWorker.java:116)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1957)
Caused by: com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file: target process not responding or HotSpot VM not loaded
   at sun.tools.attach.LinuxVirtualMachine.<init>(LinuxVirtualMachine.java:82)
   at sun.tools.attach.LinuxAttachProvider.attachVirtualMachine(LinuxAttachProvider.java:46)
   at com.sun.tools.attach.VirtualMachine.attach(VirtualMachine.java:195)
   ... 9 more
INFO [com.sun.tools.visualvm.attach.AttachModelImpl]: takeHeapDump
com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file: target process not responding or HotSpot VM not loaded
   at sun.tools.attach.LinuxVirtualMachine.<init>(LinuxVirtualMachine.java:82)
   at sun.tools.attach.LinuxAttachProvider.attachVirtualMachine(LinuxAttachProvider.java:46)
   at com.sun.tools.attach.VirtualMachine.attach(VirtualMachine.java:195)
   at com.sun.tools.visualvm.attach.AttachModelImpl.getVirtualMachine(AttachModelImpl.java:124)
Caused: java.io.IOException: Unable to open socket file: target process not responding or HotSpot VM not loaded
   at com.sun.tools.visualvm.attach.AttachModelImpl.getVirtualMachine(AttachModelImpl.java:126)
   at com.sun.tools.visualvm.attach.AttachModelImpl.takeHeapDump(AttachModelImpl.java:65)
   at com.sun.tools.visualvm.jvm.JVMImpl.takeHeapDump(JVMImpl.java:360)
[catch] at com.sun.tools.visualvm.heapdump.impl.HeapDumpProvider$1.run(HeapDumpProvider.java:97)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1957)
INFO [com.sun.tools.visualvm.attach.AttachModelImpl]: getSystemProperties
com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file: target process not responding or HotSpot VM not loaded
   at sun.tools.attach.LinuxVirtualMachine.<init>(LinuxVirtualMachine.java:82)
   at sun.tools.attach.LinuxAttachProvider.attachVirtualMachine(LinuxAttachProvider.java:46)
   at com.sun.tools.attach.VirtualMachine.attach(VirtualMachine.java:195)
   at com.sun.tools.visualvm.attach.AttachModelImpl.getVirtualMachine(AttachModelImpl.java:124)
Caused: java.io.IOException: Unable to open socket file: target process not responding or HotSpot VM not loaded
   at com.sun.tools.visualvm.attach.AttachModelImpl.getVirtualMachine(AttachModelImpl.java:126)
   at com.sun.tools.visualvm.attach.AttachModelImpl.getSystemProperties(AttachModelImpl.java:56)
   at com.sun.tools.visualvm.jvm.JVMImpl.getSystemProperties(JVMImpl.java:286)
   at com.sun.tools.visualvm.profiler.ProfilerSupport.checkJDKCalibration(ProfilerSupport.java:215)
   at com.sun.tools.visualvm.profiler.ApplicationProfilerView$MasterViewSupport.startProfiling(ApplicationProfilerView.java:325)
   at com.sun.tools.visualvm.profiler.ApplicationProfilerView$MasterViewSupport.access$900(ApplicationProfilerView.java:157)
[catch] at com.sun.tools.visualvm.profiler.ApplicationProfilerView$MasterViewSupport$5.run(ApplicationProfilerView.java:304)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1957)

_________________
...Lyall
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lostinspace2011
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Joined: 09 Sep 2005
Posts: 188

PostPosted: Mon Jul 28, 2014 4:00 am    Post subject: Reply with quote

Having the same issue. Did you ever find a work-around ?
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lostinspace2011
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Joined: 09 Sep 2005
Posts: 188

PostPosted: Mon Jul 28, 2014 4:19 am    Post subject: Reply with quote

I ended up changing the home directory in /etc/passwd for the tomcat user from /dev/null to an existing directory.

Running :

Code:
sudo -u tomcat jvisualvm


works now.
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