Bug 13034 Cannot create a Source Folder in a new Java Project
build 20020404 If you try and create a Source Folder in a Java Project you have just created you get an error preventing you from hitting finish. STEPS 1) Create Java Project Foo 2) Open New->Source Folder 3) Enter Bar as the name - you will get "Cannot nest entry Bar inside entry Foo/Bar" 4) Create a folder Bar. 5) Add it as a source folder in the Properties Dialog for Foo. No problem.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/BuildPathsBlock.java
public static interface IRemoveOldBinariesQuery {
		
		public static int YES= 0;
		public static int NO= 1;
		public static int CANCEL= 2;
		
		/**
		 * Do the callback. Returns YES, NO, CANCEL to decide if .class files should be removed from the
		 * old output location.
		 */
		int doQuery(IPath oldOutputLocation);
		
	}
	private IWorkspaceRoot fWorkspaceRoot;
	private CheckedListDialogField fClassPathList;
	private StringButtonDialogField fBuildPathDialogField;