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
}
		try {
			if (project.hasNature(JavaCore.NATURE_ID)) {
				fCurrJProject= JavaCore.create(project);
				fEntries= fCurrJProject.getRawClasspath();
				fOutputLocation= fCurrJProject.getOutputLocation();
				fProjectStatus.setOK();
				return;
			}
		} catch (CoreException e) {
			JavaPlugin.log(e);
			fCurrJProject= null;
		}	
		fProjectStatus.setError(NewWizardMessages.getString("NewSourceFolderWizardPage.error.NotAJavaProject")); 
	}
	
	
	private void updateRootStatus() {
		fRootDialogField.enableButton(fCurrJProject != null);
		if (fCurrJProject == null) {
			return;
		}
		String str= fRootDialogField.getText();
		if (str.length() == 0) {
			fRootStatus.setError(NewWizardMessages.getFormattedString("NewSourceFolderWizardPage.error.EnterRootName", fCurrJProject.getProject().getFullPath().toString())); 
		} else {
			IPath path= fCurrJProject.getProject().getFullPath().append(str);
			if (!fWorkspaceRoot.getWorkspace().validatePath(path.toString(), IResource.FOLDER).isOK()) {
				fRootStatus.setError(NewWizardMessages.getString("NewSourceFolderWizardPage.error.InvalidRootName")); 
			} else {