org.eclipse.jdt.core shadows.org.eclipse.jdt.core org.eclipse.jdt.core.javabuilder org.eclipse.ui.externaltools.ExternalToolBuilder LaunchConfigHandle <?xml version="1.0" encoding="UTF-8"?> <launchConfiguration local="false" path="/org.eclipse.jdt.core/.externalToolBuilders/jdt-core-for-aspectj.jar builder.launch"/> org.eclipse.jdt.core.javanature