Tag Archives: maven

m2eclipse and separate output folders

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The recent versions of m2eclipse (> 0.9.3) are a nightmare to get working. The biggest issues is that if you run a command line build whilst eclipse is working, one or the other will get totally borked. there is a section in the FAQ describing how to use separate output folders. Essentially you have to tell eclipse to use a certain maven profile, which changes your project configuration.

The instructions almost work. However, some plugins need the project.build.directory variable (for example for code-generation) to be set, and the FAQ does not achieve that.

Ordinarily you would have to specify the directory element in the build section:

<directory>${basedir}/${target.dir}</directory>

If you do this however, anything you launch in eclipse will not have the correct classpath. You must fully specify the output directories:

<directory>${basedir}/${target.dir}</directory>
<outputDirectory>${basedir}/${target.dir}/classes</outputDirectory>
<testOutputDirectory>${basedir}/${target.dir}/test-classes</testOutputDirectory>

I assume this is because m2eclipse is doing some kind of parsing of the pom.xml

Maven Default Execution Ids

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Maven execution IDs have changed in maven versions greater than 2.2.0.

It seems that you can disable a default a default execution by binding it to the phase “none”:

<plugin>
   <groupId>org.apache.maven.plugins</groupId>
   <artifactId>maven-dependency-plugin</artifactId>
   <executions>
      <execution>
         <id>default</id>
         <goals>
            <goal>unpack</goal>
         </goals>
         <phase>none</phase>
      </execution>
      <execution>
         <id>unpack</id>
         <phase>process-resources</phase>
         <goals>
            <goal>unpack</goal>
         </goals>
         <configuration>
            <artifactItems>
               <artifactItem>
                  [...]
               </artifactItem>
            </artifactItems>
         </configuration>
      </execution>
   </executions>
</plugin>