Full search and replace of strings in source files when copying resources

maven

Solution

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.

Problem

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}.

Original source