严重: Servlet.service() for servlet default threw exception
java.lang.NullPointerException
at cn.edu.sdau.action.AddTeacherAction.add(AddTeacherAction.java:23)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.NullPointerException
at cn.edu.sdau.action.AddTeacherAction.add(AddTeacherAction.java:23)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
AddTeacherAction.java:23
at cn.edu.sdau.action.AddTeacherAction.add(AddTeacherAction.java:23)
AddTeacherAction.java的第23行空指向异常!
AddTeacherAction.java:23 把代码贴出来看看