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MY GOAL:
I want run my application for 1000 users.
NOW
I am trying to run for 100 user. During application run, I'd like to do some process for each user that will take a minimum of one hour per user, so I'm using one thread per user.
ERROR
Caused by: java.lang.OutOfMemoryError: Java heap space
I've tried to figure out what this means, but I'm not really sure how to resolve it.
Can anybody help me?
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lang. OutOfMemoryError exception. Usually, this error is thrown when there is insufficient space to allocate an object in the Java heap. In this case, The garbage collector cannot make space available to accommodate a new object, and the heap cannot be expanded further.
Easy way to solve OutOfMemoryError in java is to increase the maximum heap size by using JVM options -Xmx512M , this will immediately solve your OutOfMemoryError.
The java. lang. OutOfMemoryError: Java heap space error occurs when it attempts to add more data into the heap space area, but there is not enough room for it. The solution to fix this problem is to increase the heap space(Default value maybe 128 MB).
As explained in the above paragraph this OutOfMemory error in java comes when the Permanent generation of heap is filled up. To fix this OutOfMemoryError in Java, you need to increase the heap size of the Perm space by using the JVM option "-XX: MaxPermSize".
This error means that your program needs more memory than your JVM allowed it to use!
Therefore you pretty much have two options:
-Xmx option (for instance for 1024 MB: -Xmx1024m)As Peter Lawrey pointed out, using a profiler to see what your program is doing in such situations is generally a good idea.
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