Java Memory Leak Analysis

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This Article is not complete... It is in Progress -
Common Causes of Memory Leak : 
Memory Leak in your application can happen because following reasons -
(1) Bad Programming - 

  • Unnecessary creation of objects and holding their references for longer time, specially static objects. static objects gets memory in perm gen. 
  • Wrong configuration of EJB components.

(2) Server Configuration
  • Heap Setting
  • Thread Count
  • Garbage Collection Algorithm
(3) Less Resources (Physical Memory)
(4) Wrong use of Cache.


Approaches for Memory Leak Analysis :  
      There are couple of things that we can do-
  • Memory Profiling of application  - JProbe
  • Thread Dump Analysis - Eclipse Plugin 
  • Heap Dump Analysis - JMap Utility for capturing Heap Dump, IBM Heap Analyzer
  • Heap Object Dump analysis - Manual Code for analysis.
  • Monitoring of the System - Introscope (watch Memory and Thread usage graph), LeakHunter
Prevent Memory Leak : 
  • Choose GC algorithm carefully. Parallel GC with Mark and Sweep Collector (MSC) works fine in most of the cases.
Please leave your comments and suggestions below...
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