Maven: Overview for the values of Maven properties - maven-3

Question

I would like to find out the values of all Maven properties as they apply to some Maven project.
mvn help:system lists OS environment variables and JVM system properties, but no Maven properties.
mvn help:evaluate only works in an interactive mode, that means I have to type a single Maven property, (e.g. ${project.build.outputDirectory}) to get the value of that property.
I'm looking for a way get a full list of all Maven properties and their values.

Answer 1

As a workaround, add this to the <plugins> ... </plugins> section inside your project's pom.xml:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-antrun-plugin</artifactId>
<version>1.7</version>
<executions>
<execution>
<phase>validate</phase>
<goals>
<goal>run</goal>
</goals>
<configuration>
<tasks>
<echoproperties />
</tasks>
</configuration>
</execution>
</executions>
</plugin>
Now execute mvn validate.
On the console, prefixed with [echoproperties], there will be the full list of system properties, including those set by Maven such as project.build.outputDirectory, basedir, and settings.localRepository.

Answer 2

the maven-help-plugin does what you want, just call it with -Dexpression=project.properties this will print the properties tag of the effective pom.
mvn help:evaluate -Dexpression=project.properties
Bonus Points when you just want the properties output and not the maven output
mvn help:evaluate -Dexpression=project.properties -q -DforceStdout
or with the explicit version because -DforceStdout works since version 3.1.0
mvn org.apache.maven.plugins:maven-help-plugin:3.2.0:evaluate -Dexpression=project.properties -q -DforceStdout

Answer 3

Not sure if helps, but I found this when trying to do the same thing:
mvn com.github.ekryd.echo-maven-plugin:echo-maven-plugin:echo -Decho.message='${project.build.testOutputDirectory}'
From here.
Adding the following to ${user.home}/.m2/settings.xml:
<pluginGroups>
<pluginGroup>com.github.ekryd.echo-maven-plugin</pluginGroup>
</pluginGroups>
the command can be shortened to:
mvn echo:echo -Decho.message='${project.build.testOutputDirectory}'

Answer 4

I don't know how to get them "officially", but here is a workaround. Add maven-antrun-plugin to your project and run mvn test -X. The plugin will show all properties passed to it from Maven. The list looks complete to me.

Answer 5

Actually project.build.outputDirectory is there but you need to execute in 'compile' phase, and NOT in 'validate'. I guess what properties are available also depends on the current phase for the executing goal of a particular plug-in, in this case 'maven-antrun-plugin'.
<!-- Ant Run Plugin for debugging pom.xml and calling ant tasks -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-antrun-plugin</artifactId>
<version>${ant.plugin.version}</version>
<executions>
<execution>
<phase>compile</phase>
<goals>
<goal>run</goal>
</goals>
<configuration>
<tasks>
<echoproperties/>
</tasks>
</configuration>
</execution>
</executions>
</plugin>

Answer 6

Had the same issue. Changed the timeout and maxheap in findbugs configuration through maven.
The below fixed it for me :
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>findbugs-maven-plugin</artifactId>
<version>3.0.2</version>
<configuration>
<maxHeap>2048</maxHeap>
<timeout>1800000</timeout>
</configuration>
</plugin>