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

StackOverflow https://stackoverflow.com/questions/2007192

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.

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Solution

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).

OTHER TIPS

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.

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).

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

mvn clean install -DargLine="-Xmx1524m"

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 &

On Linux/Unix 

export MAVEN_OPTS="-Xmx256m" && mvn clean install jetty:run

will do the trick

The plugin allows you to specify jvmArgs like this:

<plugin>
<groupId>org.mortbay.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<configuration>
    <jvmArgs>-Xmx1024</jvmArgs>
    <scanIntervalSeconds>10</scanIntervalSeconds>
    <connectors>
        <connector implementation="org.eclipse.jetty.server.nio.SelectChannelConnector">
            <port>8080</port>
            <maxIdleTime>60000</maxIdleTime>
        </connector>
    </connectors>
    <webAppConfig>
        <jettyEnvXml>jetty-env.xml</jettyEnvXml>
    </webAppConfig>
</configuration>
<executions>
    <execution>
        <phase>test</phase>
        <goals>
            <goal>run-exploded</goal>
        </goals>
    </execution>
</executions>
</plugin>

you can use to pass -Xmx argument like;

<plugin>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-maven-plugin</artifactId>
            <version></version>
            <configuration>
                <jvmArgs>-Xmx -Xms -XX:PermSize= -XX:MaxPermSize= -XX:+HeapDumpOnOutOfMemoryError</jvmArgs>
                <scanIntervalSeconds>1</scanIntervalSeconds>
                <stopKey>stop-jetty</stopKey>
                <stopPort>9999</stopPort>
                <systemProperties>
                    <systemProperty>
                        <name>jetty.port</name>
                        <value>9090</value>
                    </systemProperty>
                    <systemProperty>
                        <name>spring.profiles.active</name>
                        <value></value>
                    </systemProperty>
                </systemProperties>

                <webApp>
                    <contextPath>/</contextPath>
                </webApp>
            </configuration>
        </plugin>

There is no way using the commandline. But you could copy the mvn.cmd / mvn.sh to mvnhp.cmd and change the line 

%MAVEN_JAVA_EXE% %JVM_CONFIG_MAVEN_PROPS% %MAVEN_OPTS% %MAVEN_DEBUG_OPTS% -classpath %CLASSWORLDS_JAR% "-Dclassworlds.conf=%M2_HOME%\bin\m2.conf" "-Dmaven.home=%M2_HOME%" "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" %CLASSWORLDS_LAUNCHER% %MAVEN_CMD_LINE_ARGS%

To 

%MAVEN_JAVA_EXE% -Xmx1024m %JVM_CONFIG_MAVEN_PROPS% %MAVEN_OPTS% %MAVEN_DEBUG_OPTS% -classpath %CLASSWORLDS_JAR% "-Dclassworlds.conf=%M2_HOME%\bin\m2.conf" "-Dmaven.home=%M2_HOME%" "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" %CLASSWORLDS_LAUNCHER% %MAVEN_CMD_LINE_ARGS%
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