java.lang.OutOfMemoryError

[Arkie]

This error message can occour while running your application.

The error 'java.lang.OutOfMemoryError: Java heap space' is caused when the JVM (Java Virtual Machine) runs out of available memory during processing.  This can be caused by:
    * a system with less memory than your application / VM requires.

Sample program that causes this error:

Code

GeSHi (java):
import java.util.Vector;
 
/*--------------------------------------------------------------------------
//Author List:
// deAppel					<Creator>
//
//Description:
//	Showing java.lang.OutOfMemoryError
//
//Environment:
// This software was developed using Eclipse and Java 1.6
//
//Copyright Information:
// Copyright (C) 2007      <Institution><None>
//		Ark de Appel 			www.engineeringserver.com
//
//----------------------------------------------------------------------*/
 
public class OutOfMemory {
 
	public static void main(String[] args) {
		boolean tmp = true;
		int i = 0;
		Vector v = new Vector();
		while (tmp == true) {
			v.add(i);
			i++;
		}
	}
}
Created by GeSHI 1.0.7.20

When you run this you will get:

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
   at java.util.Vector.ensureCapacityHelper(Unknown Source)
   at java.util.Vector.add(Unknown Source)
   at OutOfMemory.main(OutOfMemory.java:10)

Why?
Because tmp is always true,  the while loop never stops and it continues to add the variable i into the vector until the JVM runs out of memory.

Solution(s):
    * add more RAM
    * typ: java -Xmx256m in your console window or java -XmxYYYm where YYY is the amount of memory you want to set.

Reference:
http://bliki.rimuhosting..../linux/java/-Xmx+settings
http://edocs.bea.com/wls/...61/perform/JVMTuning.html
http://forum.java.sun.com...read.jspa?threadID=745025

[gluk]

The solution for most of the Java related errors can be found at this site: Java errors and solutions.