我在 Eclipse 中有一个项目，上面有一个红十字，不会导出到可运行的 JAR。我不记得自从我在笔记本电脑上重新安装 Windows 后是否看过它，但我知道我没有更改任何代码。任何类都没有错误，但是我得到的错误指向以下处理 Mac OSx 上的菜单项的类：
import java.lang.reflect.*;
public class osxhandler implements InvocationHandler {
protected Object targetObject;
protected Method targetMethod;
protected String proxySignature;
static Object macOSXApplication;
// Pass this method an Object and Method equipped to perform application shutdown logic
// The method passed should return a boolean stating whether or not the quit should occur
public static void setQuitHandler(Object target, Method quitHandler) {
setHandler(new HOsx("handleQuit", target, quitHandler));
}
public static void setAboutHandler(Object target, Method aboutHandler) {
boolean enableAboutMenu = (target != null && aboutHandler != null);
if (enableAboutMenu) {
setHandler(new HOsx("handleAbout", target, aboutHandler));
}
// If we're setting a handler, enable the About menu item by calling
// com.apple.eawt.Application reflectively
try {
Method enableAboutMethod = macOSXApplication.getClass().getDeclaredMethod("setEnabledAboutMenu", new Class[] { boolean.class });
enableAboutMethod.invoke(macOSXApplication, new Object[] { Boolean.valueOf(enableAboutMenu) });
} catch (Exception ex) {
System.err.println("MacOSHandler could not access the About Menu");
ex.printStackTrace();
}
}
public static void setPreferencesHandler(Object target, Method prefsHandler) {
boolean enablePrefsMenu = (target != null && prefsHandler != null);
if (enablePrefsMenu) {
setHandler(new HOsx("handlePreferences", target, prefsHandler));
}
// If we're setting a handler, enable the Preferences menu item by calling
// com.apple.eawt.Application reflectively
try {
Method enablePrefsMethod = macOSXApplication.getClass().getDeclaredMethod("setEnabledPreferencesMenu", new Class[] { boolean.class });
enablePrefsMethod.invoke(macOSXApplication, new Object[] { Boolean.valueOf(enablePrefsMenu) });
} catch (Exception ex) {
System.err.println("MacOSHandler could not access the About Menu");
ex.printStackTrace();
}
}
// Pass this method an Object and a Method equipped to handle document events from the Finder
// Documents are registered with the Finder via the CFBundleDocumentTypes dictionary in the
// application bundle's Info.plist
public static void setFileHandler(Object target, Method fileHandler) {
setHandler(new HOsx("handleOpenFile", target, fileHandler) {
// Override MacOSHandler.callTarget to send information on the
// file to be opened
public boolean callTarget(Object appleEvent) {
if (appleEvent != null) {
try {
Method getFilenameMethod = appleEvent.getClass().getDeclaredMethod("getFilename", (Class[])null);
String filename = (String) getFilenameMethod.invoke(appleEvent, (Object[])null);
this.targetMethod.invoke(this.targetObject, new Object[] { filename });
} catch (Exception ex) {
}
}
return true;
}
});
}
// setHandler creates a Proxy object from the passed MacOSHandler and adds it as an ApplicationListener
@SuppressWarnings({ "unchecked", "rawtypes" })
public static void setHandler(HOsx adapter) {
try {
Class applicationClass = Class.forName("com.apple.eawt.Application");
if (macOSXApplication == null) {
macOSXApplication = applicationClass.getConstructor((Class[])null).newInstance((Object[])null);
}
Class applicationListenerClass = Class.forName("com.apple.eawt.ApplicationListener");
Method addListenerMethod = applicationClass.getDeclaredMethod("addApplicationListener", new Class[] { applicationListenerClass });
// Create a proxy object around this handler that can be reflectively added as an Apple ApplicationListener
Object MacOSHandlerProxy = Proxy.newProxyInstance(HOsx.class.getClassLoader(), new Class[] { applicationListenerClass }, adapter);
addListenerMethod.invoke(macOSXApplication, new Object[] { MacOSHandlerProxy });
} catch (ClassNotFoundException cnfe) {
System.err.println("This version of Mac OS X does not support the Apple EAWT. ApplicationEvent handling has been disabled (" + cnfe + ")");
} catch (Exception ex) { // Likely a NoSuchMethodException or an IllegalAccessException loading/invoking eawt.Application methods
System.err.println("Mac OS X Adapter could not talk to EAWT:");
ex.printStackTrace();
}
}
// Each MacOSHandler has the name of the EAWT method it intends to listen for (handleAbout, for example),
// the Object that will ultimately perform the task, and the Method to be called on that Object
protected HOsx(String proxySignature, Object target, Method handler) {
this.proxySignature = proxySignature;
this.targetObject = target;
this.targetMethod = handler;
}
// Override this method to perform any operations on the event
// that comes with the various callbacks
// See setFileHandler above for an example
public boolean callTarget(Object appleEvent) throws InvocationTargetException, IllegalAccessException {
Object result = targetMethod.invoke(targetObject, (Object[])null);
if (result == null) {
return true;
}
return Boolean.valueOf(result.toString()).booleanValue();
}
// InvocationHandler implementation
// This is the entry point for our proxy object; it is called every time an ApplicationListener method is invoked
public Object invoke (Object proxy, Method method, Object[] args) throws Throwable {
if (isCorrectMethod(method, args)) {
boolean handled = callTarget(args[0]);
setApplicationEventHandled(args[0], handled);
}
// All of the ApplicationListener methods are void; return null regardless of what happens
return null;
}
// Compare the method that was called to the intended method when the MacOSHandler instance was created
// (e.g. handleAbout, handleQuit, handleOpenFile, etc.)
protected boolean isCorrectMethod(Method method, Object[] args) {
return (targetMethod != null && proxySignature.equals(method.getName()) && args.length == 1);
}
// It is important to mark the ApplicationEvent as handled and cancel the default behavior
// This method checks for a boolean result from the proxy method and sets the event accordingly
protected void setApplicationEventHandled(Object event, boolean handled) {
if (event != null) {
try {
Method setHandledMethod = event.getClass().getDeclaredMethod("setHandled", new Class[] { boolean.class });
// If the target method returns a boolean, use that as a hint
setHandledMethod.invoke(event, new Object[] { Boolean.valueOf(handled) });
} catch (Exception ex) {
System.err.println("MacOSHandler was unable to handle an ApplicationEvent: " + event);
ex.printStackTrace();
}
}
}
}
关于为什么我不能导出/编译的任何想法？我以前从来没有遇到过这个问题。