自動佈線的字段保持爲空導致WicketRuntime異常

這些問題有很多，但建議的解決方案似乎不適用於我。我使用wicket隨着休眠和春天。我試着簡單的形式與一個文本框，但檢票口一直抱怨阿布NullPointerException這來自自動裝配Autowired字段爲空自動佈線的字段保持爲空導致WicketRuntime異常

檢票類

public class WebLoginPage extends WebPage { 
    @SpringBean 
    IUserService userService; 

    private final User newUser = new User(); 

    RequiredTextField<String> username = new RequiredTextField<String>(
      "username", new PropertyModel<String>(this.newUser, "username")); 

    public WebLoginPage() { 
     final Form<?> form = new Form<User>("userForm") { 

      @Override 
      protected void onSubmit() { 
       WebLoginPage.this.userService 
         .addUser(WebLoginPage.this.newUser); 
      } 

     }; 
     form.add(this.username); 
     this.add(form); 

    }

UserServiceImpl

package com.ziker.schedule.service; 

import java.io.Serializable; 

import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.stereotype.Controller; 
import org.springframework.transaction.annotation.Transactional; 

import com.ziker.schedule.dao.IUserDao; 
import com.ziker.schedule.pojo.User; 

@Controller 
public class UserServiceImpl implements IUserService, Serializable { 

    @Autowired 
    IUserDao userDao; 

    @Override 
    @Transactional 
    public void addUser(User user) { 
     this.userDao.saveUser(user); 

    } 

    @Override 
    @Transactional 
    public void deleteUser(User user) { 
     this.userDao.deleteUser(user); 

    } 
}

在UserDAOImpl

package com.ziker.schedule.dao; 

import org.hibernate.SessionFactory; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.stereotype.Repository; 

import com.ziker.schedule.pojo.User; 

@Repository 
public class UserDaoImpl implements IUserDao { 

    @Autowired 
    SessionFactory sessionFactory; 

    @Override 
    public void saveUser(User user) { 
     this.sessionFactory.getCurrentSession().saveOrUpdate(user); 

    } 

    @Override 
    public void deleteUser(User user) { 
     this.sessionFactory.getCurrentSession().delete(user); 
    } 

    public SessionFactory getSessionFactory() { 
     return this.sessionFactory; 
    } 

    public void setSessionFactory(SessionFactory sessionFactory) { 
     this.sessionFactory = sessionFactory; 
    } 

}

的applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?> 
<beans xmlns="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xmlns:context="http://www.springframework.org/schema/context" 
    xmlns:jee="http://www.springframework.org/schema/jee" 
    xmlns:lang="http://www.springframework.org/schema/lang" 
    xmlns:p="http://www.springframework.org/schema/p" 
    xmlns:tx="http://www.springframework.org/schema/tx" 
    xmlns:util="http://www.springframework.org/schema/util" 
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd 
     http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd 
     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd 
     http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee.xsd 
     http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang.xsd 
     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd 
     http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd"> 

    <context:annotation-config /> 

    <bean id="myDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> 
     <property name="driverClassName" value="com.mysql.jdbc.Driver"/> 
     <property name="url" value="jdbc:mysql://localhost:3306/schedule"/> 
     <property name="username" value="root"/> 
     <property name="password" value="rootroot"/> 
    </bean> 

    <bean id="mySessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> 
     <property name="dataSource" ref="myDataSource" /> 
     <property name="annotatedClasses"> 
      <list> 
       <value>com.ziker.schedule.pojo.User</value> 
      </list> 
     </property> 
     <property name="hibernateProperties"> 
      <props> 
       <prop key="hibernate.dialect"> org.hibernate.dialect.HSQLDialect</prop> 
       <prop key="hibernate.show_sql">true</prop> 
       <prop key="hibernate.hbm2ddl.auto">create</prop> 
      </props> 
     </property> 
    </bean> 

    <bean id="userDao" class="com.ziker.schedule.dao.UserDaoImpl"> 
    <property name="sessionFactory" ref="mySessionFactory" /> 
    </bean> 

    <bean id="userService" class="com.ziker.schedule.service.UserServiceImpl"> 

    </bean> 



</beans>

檢票網頁

包com.ziker.schedule.schedule;

import org.apache.wicket.Page;導入 org.apache.wicket.protocol.http.WebApplication;導入 org.apache.wicket.spring.injection.annot.SpringComponentInjector;

import com.ziker.schedule.login.WebLoginPage;

公共類ScheduleApplication延伸WebApplication的

{

@覆蓋公共類getHomePage（）{返回 WebLoginPage.class; }

}

任何幫助將不勝感激香港專業教育學院也嘗試過配置，而沒有運氣註釋。對我來說，似乎我在想念着一些小事情，但一天半後，我不得不問

編輯：有問題的領域是WebLogin頁IUserService userService;

堆棧跟蹤

[qtp14429558-16] ERROR org.apache.wicket.DefaultExceptionMapper - Unexpected error occurred 
org.apache.wicket.WicketRuntimeException: Method onFormSubmitted of interface org.apache.wicket.markup.html.form.IFormSubmitListener targeted at [Form [Component id = userForm]] on component [Form [Component id = userForm]] threw an exception 
    at org.apache.wicket.RequestListenerInterface.internalInvoke(RequestListenerInterface.java:268) 
    at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:216) 
    at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.invokeListener(ListenerInterfaceRequestHandler.java:241) 
    at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.respond(ListenerInterfaceRequestHandler.java:234) 
    at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:837) 
    at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64) 
    at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:265) 
    at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:222) 
    at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:293) 
    at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:261) 
    at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:203) 
    at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:284) 
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1476) 
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501) 
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137) 
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557) 
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231) 
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086) 
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:429) 
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193) 
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020) 
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135) 
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255) 
    at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154) 
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116) 
    at org.eclipse.jetty.server.Server.handle(Server.java:370) 
    at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494) 
    at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:982) 
    at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1043) 
    at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865) 
    at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240) 
    at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82) 
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696) 
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:53) 
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608) 
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543) 
    at java.lang.Thread.run(Unknown Source) 
Caused by: java.lang.reflect.InvocationTargetException 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at org.apache.wicket.RequestListenerInterface.internalInvoke(RequestListenerInterface.java:258) 
    ... 36 more 
Caused by: java.lang.NullPointerException 
    at com.ziker.schedule.login.WebLoginPage$1.onSubmit(WebLoginPage.java:30) 
    at org.apache.wicket.markup.html.form.Form.delegateSubmit(Form.java:1262) 
    at org.apache.wicket.markup.html.form.Form.process(Form.java:934) 
    at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:766) 
    at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:700) 
    ... 41 more

來源

2014-08-27 Ziker

你沒有提及哪個autowired字段爲空，也是thr是沒有日誌 – coder 2014-08-27 16:01:53

我更新了問題，但我相信stacktrace不會有幫助，但也可能是我缺少一些東西 – Ziker 2014-08-27 16:04:30

你有沒有重寫wickets應用程序init（）方法來添加SpringComponentInjector？ – coder 2014-08-27 16:11:28

你需要添加SpringComponentInjector通過覆蓋Wickets應用程序的init（）方法來注入spring bean。

來源

2014-08-27 16:38:49 coder

自動佈線的字段保持爲空導致WicketRuntime異常

回答

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