Maven: full search and replace of strings in source files when copying resources

Question

I have some java source files that use a package prefix (they are emulating some JDK classes). I use these files with the prefix to run against some unit tests. If the tests pass I want to produce a jar that contains the source files but with the package prefix removed from all the java files.

I am using maven for builds. Does any one know of a way to do this? Essentially what I want is something like the resources plugin filtering feature, but that does proper search and replace (like: s/my.package.prefix.//g), rather than filtering on ${vars}.

Answer 1

This can be solved with the antrun plugin. Firstly the sources need to be copied to the target directory, with:

<build>
  ...
  <resources>
    <resource>
      <directory>src/main/java</directory>
      <includes>
        <include>**/*.java</include>
      </includes>
    </resource>
  </resources>
  ...
</build>

Secondly you use the replace task of the antrun plugin to replace the files using the prepare package phase

<build>
    ...
  <plugin>
    <artifactId>maven-antrun-plugin</artifactId>
    <executions>
      <execution>
        <phase>prepare-package</phase>
        <configuration>
          <tasks>
            <replace token= "my.package.prefix." value="" dir="target/classes">                                 
              <include name="**/*.java"/>
            </replace>
          </tasks>
        </configuration>
        <goals>
          <goal>run</goal>
        </goals>
      </execution>
    </executions>
  </plugin>
  ...
</build>

This will copy the source files to target/classes in the process-resources phase, do a search and replace on the files inplace in the target/classes directory in the prepare-package phase and finally they will jarred up in the package phase.