strut2的问题
//查询所有Area area=null;
public List<Area> findAll() throws Exception {
List<Area> all=new ArrayList<Area>();
Session session=HibernateSessionFactory.getSession();
try {
String hql="from Area";
Query query=session.createQuery(hql);
all=query.list();
System.out.println(area.getTitle()+"^^^^^^^^^^^^^^^^");
System.out.println(area.getTimeCost()+"&&&&&&&&&&&&&");
System.out.println(area.getId()+"*****************");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
HibernateSessionFactory.closeSession();
}
return all;
}
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java.lang.NullPointerException
at daoimpl.Areadaoimpl.findAll(Areadaoimpl.java:68)
at com.yourcompany.struts.action.AreaAction.perinsert(AreaAction.java:33)
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 org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:270)
at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:187)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at filter.Codefilter.doFilter(Codefilter.java:27)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
我只是测试了一下为啥出错 exception --------------------编程问答--------------------
--------------------编程问答--------------------
楼主是不是忘记在数据库里加数据了，使用getXX方法返回一个null，所以报错了
--------------------编程问答--------------------
但是，我加数据了！
--------------------编程问答--------------------
System.out.println(area.getTitle()+"^^^^^^^^^^^^^^^^");System.out.println(area.getTimeCost()+"&&&&&&&&&&&&&");
System.out.println(area.getId()+"*****************");
去掉！试试 --------------------编程问答-------------------- System.out.println(area.getTitle()+"^^^^^^^^^^^^^^^^");
area一直都是null啊 你又没赋值 只给all赋值了而已 --------------------编程问答-------------------- 你的SessionFactory有没有初始化，， --------------------编程问答-------------------- query.list().size()有值么？ --------------------编程问答--------------------
正解 --------------------编程问答-------------------- 你没循环赋值 怎么给对象取值
--------------------编程问答-------------------- area为空嘛，我没有看到给他赋值呢，
补充：Java , Web 开发
