Howto add another test source folder to Maven and compile it to a separate folder?

Question

I have the default src/test/java folder for our unit tests. A separate folder src/integration/java is available for the integration tests.

Answer 1

Based what you've written it sounds like you didn't named your integration tests correctly and you didn't use the maven-failsafe-plugin for your integration tests. Based on the convention of the maven-failsafe-plugin you should name your integration tests like *IT.java. If you named your integration tests appropriately you can handle that with a more or less configuration like this:

  [...]
  
    [...]
     
        org.codehaus.mojo
        build-helper-maven-plugin
        1.9.1
        
          
            add-test-source
            generate-test-sources
            
              add-test-source
            
            
              
                src/integration/java
              
            
          
        
      
      [...]
  
  [...]

With the above it's possible to hold the integration tests within the same module. But this will not solve the idea of having the compiled integration tests classes into a separate folder.

Sometimes it's better to have a separate integration test module which contains only the integration tests (which results in having a multi-module build). If you like to leave the conventions of Maven you can try to configure the maven-compiler-plugin to use a different output path (eg. target/integration-tests/classes) which don't think will really work.