java - ClassNotFoundException 错误。 Eclipse IDE 出现问题

Question

使用 Android 更新进行更新后，Eclipse 配置似乎出现问题。当我想在项目中使用任何外部 jar 时，它会抛出运行时异常。请查看 logcat。

    09-09 11:08:59.605: W/dalvikvm(27652): Exception Ljava/lang/NoClassDefFoundError; thrown while initializing Lcom/google/zxing/client/android/CaptureActivity;
09-09 11:08:59.605: W/dalvikvm(27652): Class init failed in newInstance call (Lcom/androidaz/scanner/ScannerActivity;)
09-09 11:08:59.605: D/AndroidRuntime(27652): Shutting down VM
09-09 11:08:59.605: W/dalvikvm(27652): threadid=1: thread exiting with uncaught exception (group=0x41e292a0)
09-09 11:08:59.610: E/AndroidRuntime(27652): FATAL EXCEPTION: main
09-09 11:08:59.610: E/AndroidRuntime(27652): java.lang.ExceptionInInitializerError
09-09 11:08:59.610: E/AndroidRuntime(27652):    at java.lang.Class.newInstanceImpl(Native Method)
09-09 11:08:59.610: E/AndroidRuntime(27652):    at java.lang.Class.newInstance(Class.java:1319)
09-09 11:08:59.610: E/AndroidRuntime(27652):    at android.app.Instrumentation.newActivity(Instrumentation.java:1057)
09-09 11:08:59.610: E/AndroidRuntime(27652):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2015)
09-09 11:08:59.610: E/AndroidRuntime(27652):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
09-09 11:08:59.610: E/AndroidRuntime(27652):    at android.app.ActivityThread.access$600(ActivityThread.java:140)
09-09 11:08:59.610: E/AndroidRuntime(27652):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
09-09 11:08:59.610: E/AndroidRuntime(27652):    at android.os.Handler.dispatchMessage(Handler.java:99)
09-09 11:08:59.610: E/AndroidRuntime(27652):    at android.os.Looper.loop(Looper.java:137)
09-09 11:08:59.610: E/AndroidRuntime(27652):    at android.app.ActivityThread.main(ActivityThread.java:4898)
09-09 11:08:59.610: E/AndroidRuntime(27652):    at java.lang.reflect.Method.invokeNative(Native Method)
09-09 11:08:59.610: E/AndroidRuntime(27652):    at java.lang.reflect.Method.invoke(Method.java:511)
09-09 11:08:59.610: E/AndroidRuntime(27652):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
09-09 11:08:59.610: E/AndroidRuntime(27652):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
09-09 11:08:59.610: E/AndroidRuntime(27652):    at dalvik.system.NativeStart.main(Native Method)
09-09 11:08:59.610: E/AndroidRuntime(27652): Caused by: java.lang.NoClassDefFoundError: com.google.zxing.ResultMetadataType
09-09 11:08:59.610: E/AndroidRuntime(27652):    at com.google.zxing.client.android.CaptureActivity.<clinit>(CaptureActivity.java:107)
09-09 11:08:59.610: E/AndroidRuntime(27652):    ... 15 more

如果我遗漏了什么，请帮助我。如果有解决方案，请分享您的经验。

Answer 1

我在使用 ADT22 时也遇到了同样的错误。通过在属性 -> Java 构建路径 -> 订购和导出中启用“Android 私有(private)库”来解决此问题。如果您正在使用任何库项目，也应该对它们执行相同的操作。