JVM - Memory Analysis

Decompiler
Yet another fast Java decompiler http://jd.benow.ca/

Memory Dump
To create a heap dump, use the jmap command from JDK:

• jps - to find the process id
• jmap -dump:format=b,file=heap.jmap java_PID 
• -XX:+HeapDumpOnOutOfMemoryError VM parameter  
• java -Xmx256m -XX:+HeapDumpOnOutOfMemoryError -jar *.jar
•  jconsole /usr/jdk/jdk1.6.0_105/bin/jstack 24583 > outfile.txt 
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Memory dump Analysis Tools 

• jhat : http://docs.oracle.com/javase/6/docs/technotes/tools/share/jhat.html 
• VISUALVM : http://visualvm.java.net/gettingstarted.html 
• Eclipse Memory Analyzer (MAT)
• JProfiler 

References : 

• http://java.sun.com/developer/technicalArticles/J2SE/monitoring/
• http://www.oracle.com/technetwork/java/javase/index-138283.html#guides
• http://docs.oracle.com/javase/6/docs/technotes/tools/share/jhat.html 
• http://java.sun.com/developer/technicalArticles/J2SE/jconsole.html 
• http://docs.oracle.com/javase/1.5.0/docs/tooldocs/share/jmap.html 
• http://marxsoftware.blogspot.com.au/2009/06/heap-dump-and-analysis-with-visualvm.html 
• http://java.sun.com/docs/books/jvms/second_edition/html/ClassFile.doc.html 
• https://redstack.wordpress.com/2011/01/06/visualising-garbage-collection-in-the-jvm/
• https://plumbr.io/outofmemoryerror/permgen-space