Bug 14421 Old .CLASS Files Are Not Deleted
When creating a project that does NOT use source folders (and does not use a bin directory for .class files) the .java and .class files are stored together in the Java package structure. When converting a project to use source folders (and the required bin directory for .class files), the old .class files stored in the Java package structure are NEVER DELETED by Eclipse. This is a bug for Eclipse 1.0 and 2.0. Since I use WSDD 4.0 (which is built on Eclipse 1.0), I've seen compilation errors due to the fact that the compiler/JDT is using old .class files rather than the new ones in the project's bin directory. I have not managed to reproduce the compile errors in build 20020416. But since the old .class files should have been deleted this is still a bug for the latest build.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/NewSourceFolderWizardPage.java
public void init(IStructuredSelection selection) {
		if (selection == null || selection.isEmpty()) {
			setDefaultAttributes();
			return;
		}
		
		Object selectedElement= selection.getFirstElement();
		if (selectedElement == null) {
			selectedElement= EditorUtility.getActiveEditorJavaInput();
		}				
		
		String projPath= null;
		
		if (selectedElement instanceof IResource) {
			IProject proj= ((IResource)selectedElement).getProject();
			if (proj != null) {
				projPath= proj.getFullPath().makeRelative().toString();
			}	
		} else if (selectedElement instanceof IJavaElement) {
			IJavaProject jproject= ((IJavaElement)selectedElement).getJavaProject();
			if (jproject != null) {
				projPath= jproject.getProject().getFullPath().makeRelative().toString();
			}
		}	
		
		if (projPath != null) {
			fProjectField.setText(projPath);
			fRootDialogField.setText(""); 
		} else {
			setDefaultAttributes();