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/ui/wizards/NewJavaProjectWizardPage.java
public IRunnableWithProgress getRunnable() {
		return new IRunnableWithProgress() {
			public void run(IProgressMonitor monitor) throws InvocationTargetException, InterruptedException {
				if (monitor == null) {
					monitor= new NullProgressMonitor();
				}				
				monitor.beginTask(NewWizardMessages.getString("NewJavaProjectWizardPage.op_desc"), 10); 
				int workLeft= 10;
				
				if (fProjectModified || isNewProjectHandle()) {
					initBuildPaths();
				}
				
				
				IWorkspace workspace= ResourcesPlugin.getWorkspace();
				IProject project= getProjectHandle();
				try {
					if (!project.exists()) {
						IProjectDescription desc= workspace.newProjectDescription(project.getName());
						IPath locationPath= getLocationPath();
						if (Platform.getLocation().equals(locationPath)) {
							locationPath= null;
						}
						desc.setLocation(locationPath);
						project.create(desc, new SubProgressMonitor(monitor, 1));
						workLeft--;
					}
					if (!project.isOpen()) {
						project.open(new SubProgressMonitor(monitor, 1));
						workLeft--;