mostly tech stuff

Maven2 Heap Overflow in JUnit Test Cases: Howto Increase Memory

For the past few days I was wondering why Maven’s install gave me a Heap Overflow exception on JUnit tests on some of my machines. I tried increasing the memory by using the environment variable MAVEN_OPTS, by passing the option “-Xmx512m” to the JVM through Eclipse and from the command line. All to no avail.

Then I found this blog entry by Keith Chapman. And it worked! Here’s the solution in short:

The JUnit tests ignore the environment variable MAVEN_OPTS. You have to tell Maven’s surefire plugin to increase memory. Add this to your pom.xml file: [sourcecode language=‘xml’]

org.apache.maven.plugins maven-surefire-plugin

-Xms512m -Xmx512m