Celtix org.eclipse.jdt.core.javabuilder com.atlassw.tools.eclipse.checkstyle.CheckstyleBuilder org.eclipse.ui.externaltools.ExternalToolBuilder clean, LaunchConfigHandle <project>/.externalToolBuilders/Regen.launch org.eclipse.jdt.core.javanature com.atlassw.tools.eclipse.checkstyle.CheckstyleNature