How to control VM arguments for maven-jetty-plugin?

Question

How to set VM arguments for Jetty run from maven-jetty-plugin?

For example, I need to pass -Xmx arguments to Jetty run by the mvn jetty:run command.

Solution 1

The enviroment variable MAVEN_OPTS is the answer. The string content of MAVEN_OPTS is passed to JVM (java.exe).

• Linux: in shell type export MAVEN_OPTS=....
• Windows: in shell (cmd.exe) type set MAVEN_OPTS=...

For example: on Windows set MAVEN_OPTS="-Xmx1024m" sets the heap size of the Maven process to 1024mb.

Update (01.04.2013): Pass it directly to Jetty.

Matthew Farwell (please upvote his answer to give him credit) comes with the solution of using a forked JVM process to run Jetty which is a new feature of the Jetty plugin. This is a better solution as the former runs inside same JVM process as Maven (thus shares memory).

Solution 2

With more recent versions of the maven-jetty-plugin, you can use mvn:run-forked. The option jvmArgs will allow you to set -Xmx etc.

For more information, see: jetty:run-forked : Running an unassembled webapp in a separate jvm.

I think the original issue was Starting Jetty in separate JVM.

Solution 3

It seems like your current approach is correct - when running jetty through maven, jetty is a thread inside the maven process. So increasing maven's heap will increase jetty's heap.

How are you setting MAVEN_OPTS?

One example I found looks like this: MAVEN_OPTS='-Xmx256m -Xms10m' mvn clean jetty:run

Note that MAVEN_OPTS is an environment variable here, and not passed to the JVM (who wouldn't know what to do with it).

Solution 4

To specify vm arguments via the command line (as originally asked) you can do the following:

mvn clean install -DargLine="-Xmx1524m" 

Solution 5

The <jvmArgs> param mentioned here : Maven jetty plugin didn't work for me .

Maven version : Apache Maven 3.0.3

Jetty Maven plugin version : jetty-maven-plugin:8.1.10.v20130312

This worked :

MAVEN_OPTS='-Xmx4096m -Xms4096m'
export MAVEN_OPTS
mvn jetty:run &

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