空指针

[jiaojiao_huihui]

原来的包名叫common.model.entity，里面有一个java文件叫User。
我后来把包名改为了common，就出现了下面的问题：



java.lang.ClassNotFoundException: common.model.entity.User
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:604)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1575)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
at java.util.concurrent.CopyOnWriteArrayList.readObject(CopyOnWriteArrayList.java:845)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1849)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
at server.UserService.loadAllUser(UserService.java:58)
at server.ServerFrame.loadData(ServerFrame.java:114)
at server.ServerFrame.<init>(ServerFrame.java:38)
at server.ServerMain.main(ServerMain.java:56)
Exception in thread "main" java.lang.NullPointerException
at server.ServerFrame.loadData(ServerFrame.java:115)
at server.ServerFrame.<init>(ServerFrame.java:38)
at server.ServerMain.main(ServerMain.java:56)

[凡人之玲珑]

去java 类users中改下packeg的路径就可以了

[li26338710]

代码放上来

[chensuper]

反序列化操作，不认识你的新类，重新做序列化才行。