Bug 18764 JDT Welcome page: should not open in new window
The JDT Welcome page opens the Java perspective in a new window. Need to check whether the OpenJavaPerspectiveAction opens the page with the same input as the workbench opens the first window.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/actions/OpenJavaPerspectiveAction.java
/**
	 * Create a new <code></code>.
	 */
	public OpenJavaPerspectiveAction() {
	}
	public void run() {
		IWorkbenchWindow window= JavaPlugin.getActiveWorkbenchWindow();
		try {
			window.openPage(JavaUI.ID_PERSPECTIVE, JavaCore.create(ResourcesPlugin.getWorkspace().getRoot()));
		} catch (WorkbenchException e) {
			ExceptionHandler.handle(e, window.getShell(), 
				ActionMessages.getString("OpenJavaPerspectiveAction.dialog.title"), 
				ActionMessages.getString("OpenJavaPerspectiveAction.error.open_failed")); 
		}
	}
}