How to ignore the Java Source directory during Maven Compilation?

Question

I am trying to use the Lombok Maven Plugin to ensure the correct creation of Javadocs when using Lombok.

Lombok Maven introduces a new code generation goal, just pri

Answer 1

The delombok goal is designed to transform java code from src/main/lombok to target/generated-source/delombok. Then, the other java code found in src/main/java is combined with target/generated-source/delombok to produce the combined java classes.

It helps to think of delombok as a source code generator.

So how can you get what you really want? (Note that Maven has an addCompileSourceRoot method, but not a corresponding removeCompileSourceRoot.) Imagine the following hack:

1. Override the default from src/main/java to be ${project.build.directory}/generated-sources/delombok.
2. Override the default delombok sourceDirectory from src/main/lombok to be src/main/java, and disable addOutputDirectory.

Basically, you will use src/main/java, but Maven will ignore it and instead use target/generated-sources/delombok. The Lombok plugin will transform src/main/java into elaborated code in target/generated-sources/delombok.

  ${project.build.directory}/generated-sources/delombok
  
    
      org.projectlombok
      lombok-maven-plugin
      1.16.6.1
      
        
          delombok
          generate-sources
          
            delombok
          
          
            false
            src/main/java
          
        
      
    
  

Note that you should not need to hack other plugins, like maven-jar-plugin or maven-javadoc-plugin, because they should respect the sourceDirectory.

Use this hack at your own risk. (My guess is that this may confuse your IDE and some other developers.)