“Invalid maximum heap size” when running Maven

运行mvn package,报错：

Invalid maximum heap size: -Xmx512m.
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

解决方法一：

alter jvm.config in .mvn directory ( it is in controller directory ). study mvn.sh that comes with maven. you will see MAVEN_OPTS setting in the script. try out java -version before altering. eg : java -Xmx512m -version now you know how to go about and make the changes.

解决方法二：

you can try to set the initial heap size and initial permgen size relatively small, but set the proper max heap and pergent via -Xms128m -Xmx1024m -XX:PermSize=128m -XX:MaxPermSize=256m

Also don‘t set permgen to 512 - it‘s too much for typical scenarious.

Also you may want to use fork option with maven and start plugin execution in different JVMs at all.

For example

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>2.5.1</version>
    <configuration>
      <fork>true</fork>
    </configuration>
  </plugin>

Also, while allocating memory also make sure that you have that much free memory available.