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Monday, 15 February 2016

Generate Heap Dump using java Visual VM



  • A Heap Dump is a snapshot of the Java process heap memory at a given time
  • It is a useful tool to troubleshoot memory leaks and other memory related issues
  • Heap Dump is used to analyse the objects state in a JVM ,usually we analyse Heap Dump during out of memory error
Steps:
  • Go to $JAVA_HOME/bin
  • Run the command ./jvisualvm
    

bin
Invoking Visual VM from the Java Installation

  • After running the command ./jvisualvm command it automatically opens java VisualVM  window

./jvisualvm
Java VisualVM
  • Next open the process id(pid)
weblogic
Open the MBean by selecting  WebLogic Pid
  • Click on Monitor Tab --> Heap Dump Tab
Heap Dump
Click on Heap Dump Tab
  • Click on classes then Java VisualVM enables us to browse Heap Dumps as shown below with the classes view where we can identify the number and percentage of instances referred by each class.

view
Percentage of instances referred by each class


WebLogic Books

  • Oracle WebLogic Server 12c: Administration Handbook
  • WebLogic Diagnostic Framework
  • Advanced WebLogic Server Automation
  • Oracle SOA Suite 11g Administrator's Handbook

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