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
srcFolder= jproj.getProject().getFolder(sourceFolderName);
		} else {
			srcFolder= jproj.getProject();
		}
		list.add(new CPListElement(IClasspathEntry.CPE_SOURCE, srcFolder.getFullPath(), srcFolder));
		IPath libPath= new Path(JavaRuntime.JRELIB_VARIABLE);
		IPath attachPath= new Path(JavaRuntime.JRESRC_VARIABLE);
		IPath attachRoot= new Path(JavaRuntime.JRESRCROOT_VARIABLE);
		CPListElement elem= new CPListElement(IClasspathEntry.CPE_VARIABLE, libPath, null, attachPath, attachRoot, false);
		list.add(elem);
		return list;
	}
	
	private IPath getDefaultBuildPath(IJavaProject jproj) {
		if (JavaBasePreferencePage.useSrcAndBinFolders()) {
			String outputLocationName= JavaBasePreferencePage.getOutputLocationName();
			return jproj.getProject().getFullPath().append(outputLocationName);
		} else {
			return jproj.getProject().getFullPath();
		}
	}	
		
	private class BuildPathAdapter implements IStringButtonAdapter, IDialogFieldListener {
		
		public void changeControlPressed(DialogField field) {
			buildPathChangeControlPressed(field);
		}
		
		
		public void dialogFieldChanged(DialogField field) {