Problem:

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 large number of files on your system
• an extremely large benchmark document
• memory leak with some apis / user defined classes

The default heap memory in JVM sets a maximum heap size of 64MB. The directions below describe how to increase this value on UNIX and Windows systems.

Solution:

For UNIX systems, edit the catalina.sh file under tomcat_home/bin and set JAVA_OPTS as below

Where ‘-Xmx1024m’ sets the maximum heap size to 1024MB of memory. Higher values may be used where additional memory is available.

For Windows systems, edit catalina.bat, change the text -Xmx256m to a larger value. For example:

Where "-Xmx1024m" sets the maximum heap size to 1024MB of memory. Higher values may be used where additional memory is available.

Memory Problems With Mysql Connector

GOOD:
mysql.jar (221 kb, 10/7/2003)
mysql-connector-java-3.0.16-ga-bin.jar (231 kb, 11/16/2004)
mysql-connector-java-3.0.17-ga-bin.jar (241 kb, 6/22/2005)
BAD (memory leak):
mysql-connector-java-3.1.10-bin.jar (409 kb, 6/23/2005)
mysql-connector-java-3.1.14-bin.jar (449 kb, 10/18/2006)
… (other versions)
mysql-connector-java-5.1.6-bin.jar (687 KB, 3/5/2008)