处理请求时发生异常:null: java.lang.NullPointerException using Spring, Struts 2, Hibernate, MySql [英] Exception occurred during processing request: null: java.lang.NullPointerException using Spring, Struts 2, Hibernate, MySql

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问题描述

我在使用我的数据库的 create 和 insert 方法中遇到问题.我使用 Struts、Hibernate 和 Mysql 作为数据库.我一直试图解决这个问题，但没有任何结果.

I have a problem in create and insert methods that work with my database. I'm using Struts, Hibernate, and Mysql as a database. I've been trying to solve this problem for a long time but without any result.

我的班级模型:

package clowzer.charaf.model;

import java.util.Date;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;


@Entity 
@Table (name="JOUEUR")
public class Joueur{

@Id 
@Column(name="id")
private Integer id;

@Column(name="nom" )
private String nom;

@Column(name="prenom")
private String prenom;

@Column(name="pseudo")
private String pseudo;

@Column(name="login")
private String login;

@Column(name="image")
private String image;

@Column(name = "datecreationcompte")
@Temporal(TemporalType.TIMESTAMP)
private Date datecreationcompte;

@Column(name="motdepasse")
private String motdepasse;

@Column(name="statut")
private Integer statut;

@Column(name="xx")
private String xx;














public Integer getId() {
    return id;
}

public void setId(Integer id) {
    this.id = id;
}

public String getNom() {
    return nom;
}

public void setNom(String nom) {
    this.nom = nom;
}

public String getPrenom() {
    return prenom;
}

public void setPrenom(String prenom) {
    this.prenom = prenom;
}

public String getPseudo() {
    return pseudo;
}

public void setPseudo(String pseudo) {
    this.pseudo = pseudo;
}

public String getLogin() {
    return login;
}

public void setLogin(String login) {
    this.login = login;
}

public String getImage() {
    return image;
}

public void setImage(String image) {
    this.image = image;
}

public Date getDatecreationcompte() {
    return datecreationcompte;
}

public void setDatecreationcompte(Date datecreationcompte) {
    this.datecreationcompte = datecreationcompte;
}

public String getMotdepasse() {
    return motdepasse;
}

public void setMotdepasse(String motdepasse) {
    this.motdepasse = motdepasse;
}

public Integer getStatut() {
    return statut;
}

public void setStatut(Integer statut) {
    this.statut = statut;
}

public String getXx() {
    return xx;
}

public void setXx(String xx) {
    this.xx = xx;
}

}

我的 DAO 类:

package clowzer.charaf.dao.joueur;


import java.util.List;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import clowzer.charaf.model.Joueur;

public class JoueurDaoImpl implements JoueurDAO {

@Autowired 
SessionFactory sessionFactory;

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


@Override
public void ajouterjoueur(Joueur joueur) {
    sessionFactory.getCurrentSession().saveOrUpdate(joueur);        
}

我的豆子:

<?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 />


<!-- CONNEXION JDBC -->
<bean id="propertyConfigurer"
    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"
    p:location="/WEB-INF/jdbc.properties" />

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
    destroy-method="close" p:driverClassName="com.mysql.jdbc.Driver"
    p:url="jdbc:mysql://localhost/mybase" p:username="root" p:password="root" />

<!-- FIN CONNEXION JDBC -->

<bean id="sessionFactory"
    class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="configLocation">
        <value>classpath:hibernate.cfg.xml</value>
    </property>
    <property name="hibernateProperties">
        <props>
             <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>  
            <prop key="hibernate.show_sql">false</prop>
        </props>
    </property>
</bean>


<bean id="joueurDao" class="clowzer.charaf.dao.joueur.JoueurDaoImpl"></bean>
<bean id="joueurManager"    class="clowzer.charaf.service.joueur.JoueurManagerImpl"></bean>


<bean id="transactionManager"
    class="org.springframework.orm.hibernate4.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>


                                            
<tx:annotation-driven  transaction-manager="transactionManager" />

错误信息:

2016-12-02 09:57:30,204 ERROR [org.apache.struts2.dispatcher.Dispatcher] - <Exception occurred during processing request: null>
java.lang.NullPointerException
at    clowzer.charaf.dao.joueur.JoueurDaoImpl.ajouterjoueur(JoueurDaoImpl.java:57)
at clowzer.charaf.controleur.joueur.Joueur.ajouterjoueur(Joueur.java:106)
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 com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:446)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:285)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:238)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:238)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:90)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:252)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
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:242)
at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:544)
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)

推荐答案

你如何创建你的 DAO bean?该配置没有必需的属性引用.它不能在不知道 bean 配置的情况下自动装配.

How do you create your DAO beans? The configuration doesn't have required property reference. It can't just autowire without knowing beans configuration.

<property name="sessionFactory" ref="sessionFactory" />

Struts-Spring 集成可通过插件获得.从日志中您没有使用 Spring 和 Struts 2 集成.Struts 和 spring 是通过 Spring 插件集成的.默认情况下，Struts 按名称自动装配.因此，您可以将您的 DAO 或服务直接注入到操作 bean 中.您不需要为动作控制器编写配置，但对于其他 bean，您必须这样做.

Struts-Spring intergration is available via plugin. From the logs you didn't use a Spring and Struts 2 integration. Struts and spring are integrated via Spring plugin. Struts by default autowires by name. So you can inject your DAO or services directly to the action bean. You don't need to write configuration for action controllers, but for other beans you have to.

这是如何工作的

Spring 插件通过覆盖 Struts ObjectFactory 来增强核心框架对象的创建.创建对象时，使用Struts配置中的class属性来对应Spring配置中的id属性.如果未找到，该类将尝试照常创建，然后由 Spring 自动装配.对于 Actions，Spring 2 的 bean 作用域特性可用于将 Action 实例作用于会话、应用程序或自定义作用域，在默认的每个请求作用域之上提供高级定制.>

The Spring Plugin works by overriding the Struts ObjectFactory to enhance the creation of core framework objects. When an object is to be created, it uses the class attribute in the Struts configuration to correspond to the id attribute in the Spring configuration. If not found, the class will try to be created as usual, then be autowired by Spring. In the case of Actions, Spring 2's bean scope feature can be used to scope an Action instance to the session, application, or a custom scope, providing advanced customization above the default per-request scoping.

要使用插件，只需将其添加到类路径即可.

To use a plugin just add it to the classpath.

要启用 Spring 集成，只需在您的应用程序中包含 struts2-spring-plugin-x-x-x.jar.

To enable Spring integration, simply include struts2-spring-plugin-x-x-x.jar in your application.

这篇关于处理请求时发生异常:null: java.lang.NullPointerException using Spring, Struts 2, Hibernate, MySql的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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