MusicSynthesizerJ2SE org.eclipse.ui.externaltools.ExternalToolBuilder auto,full,incremental, LaunchConfigHandle <project>/.externalToolBuilders/Proto Builder.launch org.eclipse.jdt.core.javabuilder org.eclipse.jdt.core.javanature core 2 PARENT-1-PROJECT_LOC/core/src core-gen 2 PARENT-1-PROJECT_LOC/core/gen core-lib 2 PARENT-1-PROJECT_LOC/core/lib test 2 PARENT-1-PROJECT_LOC/test/src