memory error - java

[jjbkeeper]

Hey

Having a problem in java (once again). I keep getting a

java.lang.outofmemoryerror java heap space

when trying to force a program to accept very large integers...I know how I can fix this from in the command line, but how can I fix it in the source code?

[yamangman]

Use a type bigger than int? How big is a 'very large integer'?

[TheAnimus]

one of the fun things about java is which heap do they mean!

You need to profile it, and figure out what is causing the run away memory allocation. What is it the app is actually doing that is causing so much memory allocation? Is it just using a large chunk of memory on the heap, which runs out?

[Templar87]

If you turn on heap dump on OutOfMemory, then you can analyse the heap with YourKit or SAP Memory Analyzer. Even if it's not immediately obvious exactly where the problem lies (although with any luck it will be), it will probably narrow down where to look.

[jjbkeeper]

Thanks for you help guys

[Peter Parker]

Q: Did you actually fix your problem?

Sounds like you know how to use -Xmx to give your JVM more memory. Is this all you needed, or did you have an actual coding issue or reference/memory leak? I've seen 2-3 of these in projects in the past and they've been a mix of programming errors and 3rd party bugs (JDBC drivers). I'm always keen to learn more about similar problems.