ecplise调试 java.lang.NoClassDefFoundError异常解决方法

来源：互联网发布：惠州asm先进科技知乎编辑：程序博客网时间：2024/05/29 04:37

外部android工程import到ecplise中去，编译正常，运行报错，logcat 如下：

12-19 10:55:25.915: E/AndroidRuntime(2929): FATAL EXCEPTION: main
12-19 10:55:25.915: E/AndroidRuntime(2929): java.lang.NoClassDefFoundError: com.guet.SiriCN.MainActivity$1
12-19 10:55:25.915: E/AndroidRuntime(2929): at com.XXX.MainActivity.<init>(MainActivity.java:189)
12-19 10:55:25.915: E/AndroidRuntime(2929): at java.lang.Class.newInstanceImpl(Native Method)
12-19 10:55:25.915: E/AndroidRuntime(2929): at java.lang.Class.newInstance(Class.java:1429)
12-19 10:55:25.915: E/AndroidRuntime(2929): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
12-19 10:55:25.915: E/AndroidRuntime(2929): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577)
12-19 10:55:25.915: E/AndroidRuntime(2929): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
12-19 10:55:25.915: E/AndroidRuntime(2929): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
12-19 10:55:25.915: E/AndroidRuntime(2929): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
12-19 10:55:25.915: E/AndroidRuntime(2929): at android.os.Handler.dispatchMessage(Handler.java:99)
12-19 10:55:25.915: E/AndroidRuntime(2929): at android.os.Looper.loop(Looper.java:123)
12-19 10:55:25.915: E/AndroidRuntime(2929): at android.app.ActivityThread.main(ActivityThread.java:4627)
12-19 10:55:25.915: E/AndroidRuntime(2929): at java.lang.reflect.Method.invokeNative(Native Method)
12-19 10:55:25.915: E/AndroidRuntime(2929): at java.lang.reflect.Method.invoke(Method.java:521)
12-19 10:55:25.915: E/AndroidRuntime(2929): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run

找了很多原因，最后发现时引入外部jar包的时候，如果该jar包不在lib目录中，需要单独再引用一次，解决方法如下：

properties - java build path - order and export页面