Bug 11814 OpenExternalJavadoc action should not call findElement on JAR
This causes an exception: Java Model Exception: Java Model Status [Invalid path: C:/Java/IBM1.3/jre/lib/rt.jar.] at org.eclipse.jdt.internal.core.JavaProject.findElement(JavaProject.java:435) at org.eclipse.jdt.internal.ui.actions.OpenExternalJavadocAction.run(OpenExternalJavadocAction.java:102) at org.eclipse.ui.texteditor.RetargetTextEditorAction.run(RetargetTextEditorAction.java:103) at org.eclipse.jface.action.Action.runWithEvent(Action.java:473) at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:407) at org.eclipse.jface.action.ActionContributionItem.handleWidgetEvent(ActionContributionItem.java(Compiled Code)) at org.eclipse.jface.action.ActionContributionItem$ActionListener.handleEvent(ActionContributionItem.java(Compiled Code)) at org.eclipse.jface.action.ActionContributionItem$ActionListener.handleEvent(ActionContributionItem.java(Compiled Code)) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java(Compiled Code)) at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java(Compiled Code)) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java(Compiled Code)) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java(Compiled Code)) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java(Compiled Code)) at org.eclipse.ui.internal.Workbench.run(Workbench.java:698) at org.eclipse.core.internal.boot.InternalBootLoader.run(InternalBootLoader.java:777) at org.eclipse.core.boot.BootLoader.run(BootLoader.java:319) at java.lang.reflect.Method.invoke(Native Method) at org.eclipse.core.launcher.Main.basicRun(Main.java:196) at org.eclipse.core.launcher.Main.run(Main.java:555) at org.eclipse.core.launcher.UIMain.main(UIMain.java:52) 4 org.eclipse.jdt.core 979 Invalid path: C:/Java/IBM1.3/jre/lib/rt.jar.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/SourceAttachmentBlock.java
dialog.setMessage(NewWizardMessages.getString("SourceAttachmentBlock.prefixdialog.message")); 
				dialog.setInput(zipFile);
				dialog.setInitialSelection(contentProvider.getSelectedNode(initSelection));
				if (dialog.open() == dialog.OK) {
					Object obj= dialog.getFirstResult();
					IPath path= new Path(obj.toString());
					if (fIsVariableEntry) {
						path= modifyPath(path, currPath.segment(0));
					}
					return path;
				}
			} catch (IOException e) {
				String title= NewWizardMessages.getString("SourceAttachmentBlock.prefixdialog.error.title"); 
				String message= NewWizardMessages.getFormattedString("SourceAttachmentBlock.prefixdialog.error.message", fResolvedFile.getPath()); 
				MessageDialog.openError(getShell(), title, message);
				JavaPlugin.log(e);
			}				
		
		}
		return null;
	}
	
	/*
	 * Opens a dialog to choose a root in the file system.
	 */	
	private URL chooseJavaDocLocation() {
		String initPath= ""; 
		if (fJavaDocLocation != null && "file".equals(fJavaDocLocation.getProtocol())) { 
			initPath= (new File(fJavaDocLocation.getFile())).getPath();
		}