Question

We use MySQL in production, and Derby for unit tests. Our pom.xml copies Derby version of persistence.xml before tests, and replaces it with the MySQL version in prepare-package phase:

 <plugin>
  <artifactId>maven-antrun-plugin</artifactId>
  <version>1.3</version>
  <executions>
   <execution>
    <id>copy-test-persistence</id>
    <phase>process-test-resources</phase>
    <configuration>
     <tasks>
      <!--replace the "proper" persistence.xml with the "test" version-->
      <copy
       file="${project.build.testOutputDirectory}/META-INF/persistence.xml.test"
       tofile="${project.build.outputDirectory}/META-INF/persistence.xml"
       overwrite="true" verbose="true" failonerror="true" />
     </tasks>
    </configuration>
    <goals>
     <goal>run</goal>
    </goals>
   </execution>
   <execution>
    <id>restore-persistence</id>
    <phase>prepare-package</phase>
    <configuration>
     <tasks>
      <!--restore the "proper" persistence.xml-->
      <copy
       file="${project.build.outputDirectory}/META-INF/persistence.xml.production"
       tofile="${project.build.outputDirectory}/META-INF/persistence.xml"
       overwrite="true" verbose="true" failonerror="true" />
     </tasks>
    </configuration>
    <goals>
     <goal>run</goal>
    </goals>
   </execution>
  </executions>
 </plugin>

The problem is, that if I execute mvn jetty:run it will execute the test persistence.xml file copy task before starting jetty. I want it to be run using the deployment version. How can I fix this?

Answer 1

The jetty:run goal invokes the execution of the lifecycle phase test-compile prior to executing itself. So skipping tests execution won’t change anything.

What you need to do is to bind the copy-test-persistence execution to a lifecycle phase posterior to test-compile but prior to test. And there aren’t dozen of candidates but only one: process-test-classes.

That’s conceptually maybe not ideal, but it’s the least worse option, and it will work:

 <plugin>
  <artifactId>maven-antrun-plugin</artifactId>
  <version>1.3</version>
  <executions>
   <execution>
    <id>copy-test-persistence</id>
    <phase>process-test-classes</phase>
    <configuration>
     <tasks>
      <!--replace the "proper" persistence.xml with the "test" version-->
      <copy
       file="${project.build.testOutputDirectory}/META-INF/persistence.xml.test"
       tofile="${project.build.outputDirectory}/META-INF/persistence.xml"
       overwrite="true" verbose="true" failonerror="true" />
     </tasks>
    </configuration>
    <goals>
     <goal>run</goal>
    </goals>
   </execution>
   ...
  </executions>
 </plugin>