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What’s this?

This is lab show basic troubleshooting procedure for JVM heap related problem.

Navigate to jvm/heap/heapusage, build and generate archive jar as below:

mvn clean install

Start JVM Heap Analysis Lab Application use below commands:

java -Dcom.sun.management.jmxremote -Xms512m -Xmx512m -XX:MaxPermSize=128m -XX:+HeapDumpOnOutOfMemoryError -verbose:gc -Xloggc:gc.log -XX:+PrintGCDetails -XX:+PrintGCDateStamps -cp ./target/heapusage.jar MAT

Lab Environment

  • java

java version "1.6.0_31"
Java(TM) SE Runtime Environment (build 1.6.0_31-b04)
Java HotSpot(TM) Server VM (build 20.6-b01, mixed mode)

  • OS

Linux localhost.localdomain 2.6.43.8-1.fc15.i686.PAE #1 SMP Mon Jun 4 20:21:39 UTC 2012 i686 i686 i386 GNU/Linux

Use Eclipse MAT Analysising Heap Dump

Generate Heap Dump

Due to we use Sun JDK 1.6, so we can use the following commands to generate a heap dump:

jmap -dump:format=b,file=heap.hprof JAVA_PID
Note
 jmap -J-d64 -dump:format=b,file=heap.hprof JAVA_PID for Sun JDK 1.6, OpenJDK 64-bit, Linux OS