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/buildpaths/BuildPathsBlock.java
/**
	 * Creates a runnable that sets the configured build paths.
	 */
	public IRunnableWithProgress getRunnable() {
		final List classPathEntries= fClassPathList.getElements();
		final IPath path= getOutputLocation();
		
		return new IRunnableWithProgress() {
			public void run(IProgressMonitor monitor) throws InvocationTargetException {
				if (monitor == null) {
					monitor= new NullProgressMonitor();
				}				
				monitor.beginTask(NewWizardMessages.getString("BuildPathsBlock.operationdesc"), 10); 
				try {
					createJavaProject(classPathEntries, path, monitor);
				} catch (CoreException e) { 
					throw new InvocationTargetException(e);
				} finally {
					monitor.done();
				}
			}
		};
	}		
	
	/**
	 * Creates the Java project and sets the configured build path and output location.
	 * If the project already exists only build paths are updated.