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I'm currently having this problem where I am executing a query that will load large of records. At first execution, it is successful, but when I execute again, I am having java heap size out of memory.

I Know I can increase java heap size using command line, but that requires a compiled jar file. But I am currently on the development process, so how can I increase java heap size in that case?

Im using Elipse as my IDE.

Thanks for any response.

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  • See this question: stackoverflow.com/questions/880855/…. Is that what you are looking for? Commented Mar 10, 2012 at 8:14
  • Be careful. It may be that you're not using Hibernate properly and it certainly sounds like the application you're building could end up with memory issues. Commented Mar 10, 2012 at 17:08
  • @ james DW, although it worked by adding a vm argument -Xmx1024m, I am still considering your suggestion, I think there is also problem on how I used hibernate that's why I'm having this error! Commented Mar 11, 2012 at 23:45

3 Answers 3

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It doesn't require a compiled jar file. Choose Run - Run configurations... - Select your run configuration - Arguments tab. Then enter the appropriate command line argument in the VM arguments text box: -Xmx1024m for example.

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Recto, if this was the correct answer you should mark it as such.
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You can modify the eclipse.ini file located inside of our eclipse directory .
There you will find Xms40m Xmx256m parameter with some value , you can increase it to Xms256m Xmx1024m . Then check whether outofmemory error is still there . If its there then try tuning these parameter slightly increasing and check.

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This will modify Eclipse's own memory parameters. It won't change the memory parameters of the programs launched by Eclipse.
Yeah right . Actually all the component using java memory can be handeled by providing these parameters in different places. Like when when starting the server with these parameters
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Apperently that was not enough for an answer... well, let me just copy the text from those answers instead :S

You can use the environment variable _JAVA_OPTIONS to set the default heap size. This will change the heap size for all Java programs. Like this:

export _JAVA_OPTIONS="-Xmx1g"

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