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- Dec 21, 2017 11:29:42 PM org.apache.struts2.dispatcher.DefaultDispatcherErrorHandler error
- SEVERE: Exception occurred during processing request: null
- java.lang.NullPointerException
- at stu.libraryManagementSystem.dao.UserOperation.UserOperation.UserCheck(UserOperation.java:21)
- at stu.libraryManagementSystem.action.UserAction.UserCheck(UserAction.java:16)
- at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
- at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
- at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
- at java.lang.reflect.Method.invoke(Method.java:498)
- at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:870)
- at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1293)
- at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)
- at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117)
- at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108)
- at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1369)
- at ognl.ASTMethod.getValueBody(ASTMethod.java:90)
- at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
- at ognl.SimpleNode.getValue(SimpleNode.java:258)
- at ognl.Ognl.getValue(Ognl.java:494)
- at ognl.Ognl.getValue(Ognl.java:458)
- at com.opensymphony.xwork2.ognl.OgnlUtil$2.execute(OgnlUtil.java:309)
- at com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecute(OgnlUtil.java:340)
- at com.opensymphony.xwork2.ognl.OgnlUtil.getValue(OgnlUtil.java:307)
- at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:423)
- at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:287)
- at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:250)
- at org.apache.struts2.interceptor.DeprecationInterceptor.intercept(DeprecationInterceptor.java:41)
- at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
- at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
- at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
- at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:167)
- at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
- at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
- at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
- at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:76)
- at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
- at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
- at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
- at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
- at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)
- at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
- at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
- at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)
- at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
- at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
- at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)
- at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
- at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)
- at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
- at org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept(DateTextFieldInterceptor.java:125)
- at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
- at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)
- at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
- at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:253)
- at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
- at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
- at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
- at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
- at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
- at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
- at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
- at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
- at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
- at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
- at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:139)
- at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
- at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
- at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
- at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)
- at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
- at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)
- at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
- at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
- at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:564)
- at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:81)
- at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)
- at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
- at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
- at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
- at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
- at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
- at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
- at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
- at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
- at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
- at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
- at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
- at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
- at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
- at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
- at
- org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
- at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
- at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
- at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
- at java.lang.Thread.run(Thread.java:745)
- package stu.libraryManagementSystem.dao.UserOperation;
- import java.util.Iterator;
- import java.util.List;
- import org.hibernate.Query;
- import org.hibernate.Session;
- import stu.libraryManagementSystem.dao.SessionFactory.HibernateSessionFactory;
- import stu.libraryManagementSystem.dao.model.user.*;
- public class UserOperation implements INFUserOperation{
- private User user = null;
- private String name = "";
- private String password = "";
- public UserOperation(){}
- public int UserCheck(String name, String password){
- String hql = "from Users u where u.name=?";
- Query query = HibernateSessionFactory.getSession().createQuery(hql);
- query.setParameter(0, this.name);
- List list = query.list();
- Iterator it = list.iterator();
- int result = 0;
- if(it.hasNext()){
- result = 1;
- user = (User)it.next();
- if(user.getPassword().equals(this.password))
- result = 2;
- }
- HibernateSessionFactory.closeSession();
- return result;
- }
- }
- package stu.libraryManagementSystem.action;
- import com.opensymphony.xwork2.ActionSupport;
- import stu.libraryManagementSystem.dao.UserOperation.*;
- import stu.libraryManagementSystem.dao.model.user.User;
- public class UserAction extends ActionSupport {
- User user = null;
- INFUserOperation operation = new UserOperation();
- public String UserCheck(){
- String name = user.getName();
- String password = user.getPassword();
- String result = ERROR;
- switch(operation.UserCheck(name, password)){
- case 0:{
- result = "NoUserError";
- break;
- }
- case 1:{
- result = "PasswordError";
- break;
- }
- case 2:{
- result = SUCCESS;
- }
- }
- return result;
- }
- public User getUser() {
- return user;
- }
- public void setUser(User user) {
- this.user = user;
- }
- }
- <?xml version="1.0" encoding="UTF-8"?>
- <!DOCTYPE struts PUBLIC
- "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
- "http://struts.apache.org/dtds/struts-2.3.dtd">
- <struts>
- <package name="default" namespace="/" extends="struts-default">
- <action name="UserCheck" class="stu.libraryManagementSystem.action.UserAction" method="UserCheck">
- <result name="NoUserError">/error/NoUserError.jsp</result>
- <result name="PasswordError">/error/PasswordError.jsp</result>
- <result name="error">/error/error.jsp</result>
- <result name="success">/MainPage.jsp</result>
- </action>
- </package>
- </struts>
- <%@ page language="java" pageEncoding="utf-8"%>
- <%@ taglib prefix="s" uri="/struts-tags"%>
- <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
- <html>
- <head>
- <title>Library Management System</title>
- <link rel="stylesheet" type="text/css" href="base.css" />
- </head>
- <body>
- <div id="head">
- <h1>Welcome</h1>
- </div>
- <div id="section" style="margin:0 auto;text-align:center">
- <s:form action="action/UserCheck" method="post" theme="simple">
- UserName : <s:textfield name="user.name" size="20" /><br>
- Password : <s:password name="user.password" size="20" /><br>
- <s:submit value="submit" />
- <s:reset value="reset" />
- </s:form>
- </div>
- </body>
- </html>
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