Code not compiling (Eclipse Scala IDE)

Question

If I create a new Scala project in the Eclipse Scala IDE, my code compiles and runs. However, when I import an existing project, my code doesn't compile (no class files are generated) and I get a NoClassDefFoundError in the console. Any ideas what could cause this? Do I need additional software?

Answer 1

As mentioned in comments, this is often the symptom of missing dependencies in your imported project, either jars or other projects (which should be imported and buildable in the IDE).