Java heap space error while creating ArrayList of large number of objects?

Question

I have created an ArrayList (Java) of my custom class objects with a size around 3000. But when I run my code it gets the error "Heap space error".

I want to keep thousands of objects in an ArrayList at runtime without getting out of heap space.

How can the heap space error be avoided?

increase your heap by specifying the -Xmx parameter when launching the virtual machine. — clamp
– clamp, Commented Jun 2, 2011 at 9:42
possible duplicate of How to deal with "java.lang.OutOfMemoryError: Java heap space" error (64MB heap size) — x4u
– x4u, Commented Jun 2, 2011 at 9:48

Peter Mortensen · Accepted Answer · 2011-07-03 23:37:58Z

4

It seems like you need to pass your program more memory.

Try running it like this:

java -Xmx256M MyApp

-Xmx sets the maximum heap size for Java. Putting M afterwards means megabytes, and G afterwards means gigabytes. So you can always do this if you have a bunch of memory:

java -Xmx1g MyApp

edited Jul 3, 2011 at 23:37

Peter Mortensen

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answered Jun 2, 2011 at 9:44

jberg

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Peter Mortensen · Accepted Answer · 2011-07-03 23:38:36Z

2

Increase the Java heap size with the -Xmx Java system property. For example, give it as

java -Xmx1024m Main

edited Jul 3, 2011 at 23:38

Peter Mortensen

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answered Jun 2, 2011 at 9:43

Ramesh PVK

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