Setting Tomcat Heap Size (JVM Heap) in Eclipse

apache-tomcat-eclipseRecently while running Tomcat under Eclipse for one of the web application I was getting Java Heap memory related error java.lang.OutOfMemoryError. What needs to be done here basically is to increase the jvm heap size. So for increasing the JVM Heap Size of Tomcat in Eclipse we have to set few VM arguments of the tomcat. Follow the simple steps to change the Heap Size of Tomcat under Eclipse. 1. Open the Server tab in Eclipse and double click the Tomcat server to open Server Configuration. eclipse-tomcat-tab 2. In Server Configuration, click on the Launch Configuration link under General Information. tomcat-config-eclipse 3. Under Arguments tab, add following values in VM arguments.
-Xms64m -Xmx256m
Code language: Java (java)
tomcat-jvm-config To know more about -Xm options read this article.
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  1. jens says:


    thanks so much for this great and helpful blog post!!! it helped me such much, thanks!!!!


  2. nitin says:

    Thank you very much for the screen shots..!

  3. darfat says:

    thanks, for this briliant article,!!

  4. goldo says:

    Thx for the tip ;)
    Is there a way to persist this change in an external config file (or other) to avoid edit launch configuration each time eclipse is restarted ?
    Thx in advance.

  5. aldo says:


  6. David says:

    ¬°Great post! Thanks from Mx

  7. Geoff says:

    Awesome – love succinct articles that get to the point AND are spot on.

  8. Murali says:

    Thanks, This helped me.

  9. navneet says:

    thanks its really helpfull

  10. Serkan says:

    Thanks mate, it is very helpful

  11. Sandeep says:

    bang on the target! thanks :)

  12. Badal says:

    awesome…to the point..thanks

  13. Ritesh says:

    Could any one explain the advantage of initializing the instance variables inside a constructor, the same thing we can do after the object has been initialized and calling the respective setters method.

  14. Edrisse says:

    You are the man. I looked for this so bad. Thanks.

  15. mohan says:

    How do we set VM arguments in tomcat running outside of eclipse like from dos prompt ?

  16. Srikanth says:

    This helped me.. Thank you so much!!

  17. Gozde says:

    You really helped me to save a lot of time, thank you so much!!!

  18. JavaGirl says:

    This is really helpful. Thank you very much!

  19. krish says:

    thank u for u r answer

  20. kark says:

    its working well when we read a large size article first time, if you read the second time that file, it shows Same heap space problem

  21. Jahir says:

    It is really great, thanks :)

  22. Rob says:

    Thanks! That works fine! :-)

  23. Gustavo says:

    Man, your solution is the only one that has worked for me, thanks a lot, keep up the good work

  24. senthil says:

    Fantastic man….

  25. Mou says:

    Can you tell me the max Limitation for JVM Heap Space.My requirement is to increase the heap size more than 1 GB…Can you suggest me an idae…..

    • Rama Yaganti says:

      Max Limitations of heap space is depends on your Server capacity & Ram. For 1Gb there wont be problem . if you have 8 gb ram there wont be problem to keep you Heap size limited to 2 Gb

  26. Rifaquat says:

    Thnx viral i was finding solution from last nyte i found it here in very easy way….

  27. suraj says:

    really a good information …
    bt i want to increase permgen memory ….
    do you know how to ?
    then do let mi know..

  28. Rakhunathan says:

    Setting vmargs in Eclipse.ini to the below and then making the above change in tomcat worked for me.:)

  29. faariz says:

    But Still my problem is not solved. It is saying that,”java.lang.OutOfMemoryError: PermGen space”

  30. gaurav singh says:

    How to monitor tc server heap size with the help of servlet

  31. Spectra says:

    I should be having enough size for my homebased unit.

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