I am converting a large Java project to use maven. I have a LOT of inter dependencies to work out, but I would like to get it off the ground with maven before I do the real cleanup work. I have broken it up into a few modules plus one giant module; let's call that module monolith. Monolith has regular Java classes and some gwt classes (with interdependencies). I separated the two parts to have a directory structure like this: > ./src/main/java/... > ./src/client/gwt/... So, I can easily get this to compile in eclipse with m2eclipse, but then I can't seem to find how to get it to compile with maven. I saw that the pom file has a build section where you can specify an alternate source and target, but I think it is not a repeatable attribute in the pom: ${basedir}/src/main/java In eclipse, I can adjust the project's .classpath file (in the project properties) to add additional source files (and output dirs) to accomplish what I am looking to do. Is there any way to do this, or do I need to work out the dependencies first, and separate into separate modules?