Bug 17618 Changing output location should delete all derived resources
F1 1) create a project (autobuild on) 2) import Java sources and resources 3) change output folder to project/bin ->all class files are removed (fine) 4) change output folder back to be the project -> all class files are removed (fine) 5) open project/bin -> all resources are still there Note: When opening the properties dialog on such a resource it is tagged as "Derived". Thus, it should be possible to remove all derived resources as long as they have been created by the Java builder.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/BuildPathsBlock.java
IClasspathEntry curr= classpathEntries[i];
			
			IPath path= curr.getPath();
			
			
			IResource res= null;
			boolean isMissing= false;
			
			switch (curr.getEntryKind()) {
				case IClasspathEntry.CPE_CONTAINER:
					res= null;
					try {
						isMissing= (JavaCore.getClasspathContainer(path, fCurrJProject) == null);
					} catch (JavaModelException e) {
						isMissing= true;
					}
					break;
				case IClasspathEntry.CPE_VARIABLE:
					IPath resolvedPath= JavaCore.getResolvedVariablePath(path);
					res= null;
					isMissing=  fWorkspaceRoot.findMember(resolvedPath) == null && !resolvedPath.toFile().isFile(); 
					break;
				case IClasspathEntry.CPE_LIBRARY:
					res= fWorkspaceRoot.findMember(path);
					if (res == null) {
						if (!ArchiveFileFilter.isArchivePath(path)) {
							if (fWorkspaceRoot.getWorkspace().validatePath(path.toString(), IResource.FOLDER).isOK()) {
								res= fWorkspaceRoot.getFolder(path);
							}
						}