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
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 * Copyright (c) 2000, 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
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 * Contributors:
 *     IBM Corporation - initial API and implementation
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package org.eclipse.jdt.internal.ui.wizards;
import java.io.File;
import java.util.HashMap;
import java.util.Map;
import java.util.Observable;
import java.util.Observer;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.resources.IProject;