Bug 103026 When detected a 1.5 JDK on a fresh workspace as a default the default compiler complaince should be switch to 5.0
3.1 Compiling with compiler complaince 1.4 against a 5.0 VM can cause some trouble with covariant return types. Therefore when detecting the default VM for a fresh workspace the launching plug-in should switch the default compiler compliance to 5.0 when a 1.5 VM is detected.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/JavaProjectWizardFirstPage.java
if (o instanceof LocationGroup) {
				boolean oldDetectState= fDetect;
				if (fLocationGroup.isInWorkspace()) {
					String name= getProjectName();
					if (name.length() == 0 || JavaPlugin.getWorkspace().getRoot().findMember(name) != null) {
						fDetect= false;
					} else {
						final File directory= fLocationGroup.getLocation().append(getProjectName()).toFile();
						fDetect= directory.isDirectory();
					}
				} else {
					final File directory= fLocationGroup.getLocation().toFile();
					fDetect= directory.isDirectory();
				}
				
				if (oldDetectState != fDetect) {
					setChanged();
					notifyObservers();
					
					updateLabel();
				}
			}
		}
		public boolean mustDetect() {
			return fDetect;
		}
		/* (non-Javadoc)
		 * @see org.eclipse.swt.events.SelectionListener#widgetSelected(org.eclipse.swt.events.SelectionEvent)
		 */
		public void widgetSelected(SelectionEvent e) {