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
} else if (field == fProjectField) {
			updateProjectStatus();
			updateRootStatus();
		} else if (field == fEditClassPathField) {
			if (showClassPathPropertyPage()) {
				updateProjectStatus();
				updateRootStatus();
			}
		}
		updateStatus(new IStatus[] { fProjectStatus, fRootStatus });
	}
	
	
	private void updateProjectStatus() {
		fCurrJProject= null;
		
		String str= fProjectField.getText();
		if (str.length() == 0) {
			fProjectStatus.setError(NewWizardMessages.getString("NewSourceFolderWizardPage.error.EnterProjectName")); 
			return;
		}
		IPath path= new Path(str);
		if (path.segmentCount() != 1) {
			fProjectStatus.setError(NewWizardMessages.getString("NewSourceFolderWizardPage.error.InvalidProjectPath")); 
			return;
		}
		IProject project= fWorkspaceRoot.getProject(path.toString());
		if (!project.exists()) {
			fProjectStatus.setError(NewWizardMessages.getString("NewSourceFolderWizardPage.error.ProjectNotExists")); 
			return;