Question

我遇到了一个我无法理解的奇怪错误......当我运行我的web项目时...我的jsp显示出来了。但是在单击提交底部后，它会挂起然后出现错误结果。我无法理解我做错了什么..就像3小时试图检查我的问题。但是现在我需要一些帮助..谢谢你们。

Unable to instantiate Action, lotmovement.action.RegisterAction,  defined for 'register' in namespace '/'Error creating bean with name 'registeraction' defined in class path resource [spring.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [lotmovement.action.RegisterAction]: Constructor threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'registeraction' defined in class path resource [spring.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [lotmovement.action.RegisterAction]: Constructor threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'registeraction' defined in class path resource [spring.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [lotmovement.action.RegisterAction]: Constructor threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'registeraction' defined in class path resource [spring.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [lotmovement.action.RegisterAction]: Constructor threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'registeraction' defined in class path resource [spring.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: [spring.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [lotmovement.action.RegisterAction]: Constructor threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'registeraction' defined in class path resource [spring.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [lotmovement.action.RegisterAction]: Constructor threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'registeraction' defined in class path resource [spring.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [lotmovement.action.RegisterAction]: Constructor threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'registeraction' defined in class path resource [spring.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [lotmovement.action.RegisterAction]: Constructor threw exception; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [spring.xml]; nested exception is java.lang.StackOverflowError
    org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:115)
    org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:61)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:877)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:839)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:440)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
    java.security.AccessController.doPrivileged(Native Method)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
    org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
    org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
    org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
    org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
    org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:429)
    org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:728)
    org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:380)
    org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    lotmovement.action.RegisterAction.<init>(RegisterAction.java:27)
    sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    java.lang.Class.newInstance0(Class.java:372)
    java.lang.Class.newInstance(Class.java:325)
    com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:131)
    com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:162)
    com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:151)
    com.opensymphony.xwork2.ObjectFactory.buildAction(ObjectFactory.java:121)
    com.opensymphony.xwork2.DefaultActionInvocation.createAction(DefaultActionInvocation.java:300)
    com.opensymphony.xwork2.DefaultActionInvocation.init(DefaultActionInvocation.java:400)
    com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:194)
    org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)
    org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)
    com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)
    org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:501)
    org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:432)

在tomcat服务器上，这会不断重复..

Nov 26, 2012 3:10:51 PM org.springframework.beans.factory.support.DefaultSingletonBeanRegistry destroySingletons
INFO: Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@2d43b35f: defining beans [userprofile,registeraction,insertuserprofile,entitystart,recordexistuserprofile]; root of factory hierarchy
Nov 26, 2012 3:10:51 PM org.springframework.beans.factory.support.DefaultSingletonBeanRegistry destroySingletons
INFO: Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@50016db: defining beans [userprofile,registeraction,insertuserprofile,entitystart,recordexistuserprofile]; root of factory hierarchy
Nov 26, 2012 3:10:51 PM org.springframework.beans.factory.support.DefaultSingletonBeanRegistry destroySingletons
INFO: Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@7ef1277f: defining beans [userprofile,registeraction,insertuserprofile,entitystart,recordexistuserprofile]; root of factory hierarchy
Nov 26, 2012 3:10:51 PM org.springframework.beans.factory.support.DefaultSingletonBeanRegistry destroySingletons
INFO: Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@3d510eb6: defining beans [userprofile,registeraction,insertuserprofile,entitystart,recordexistuserprofile]; root of factory hierarchy
Nov 26, 2012 3:10:51 PM org.springframework.beans.factory.support.DefaultSingletonBeanRegistry destroySingletons
INFO: Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@66893099: defining beans [userprofile,registeraction,insertuserprofile,entitystart,recordexistuserprofile]; root of factory hierarchy
Nov 26, 2012 3:17:59 PM org.apache.catalina.startup.HostConfig checkResources
INFO: Undeploying context [/LotMovement_5spingtest]

这是我的XML文件。

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

    <bean id="userprofile"  class="lotmovement.business.entity.UserProfile">

    </bean>

    <bean id="registeraction"  class="lotmovement.action.RegisterAction">

    </bean>  

    <bean id="insertuserprofile"  
          class="lotmovement.business.crud.InsertUserProfile">

    </bean>


    <bean id="entitystart"  
          class="lotmovement.business.crud.EntityStart">

    </bean>

    <bean id="recordexistuserprofile"  
           class="lotmovement.business.crud.RecordExistUserProfile">

    </bean>


</beans>

这是我的一些代码..

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package lotmovement.action;

import com.opensymphony.xwork2.ActionSupport;
import lotmovement.business.crud.EntityStart;
import lotmovement.business.crud.InsertUserProfile;
import lotmovement.business.crud.RecordExistUserProfile;
import lotmovement.business.entity.UserProfile;
import org.apache.commons.lang3.StringUtils;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 *
 * @author god-gavedmework
 */
public class RegisterAction extends ActionSupport {

    private static String userId;
    private static String password;
    private static String firstName;
    private static String lastName;
    private static int securityLevel;
    ApplicationContext context =
            new ClassPathXmlApplicationContext("spring.xml");
    EntityStart es = (EntityStart) context.getBean("entitystart");

    @Override
    public void validate() {
        es.StartDbaseConnection();
        RecordExistUserProfile reup =
                (RecordExistUserProfile) context.getBean("recordexistuserprofile");
        if (reup.checkrecordexist()) {
            addActionError("record already exist.");
        }
    }

    @Override
    public String execute() {



        InsertUserProfile iup =
                (InsertUserProfile) context.getBean("insertuserprofile");



        iup.Insert();


        return SUCCESS;
    }

这是我的WEB.XML

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>register.jsp</welcome-file>
    </welcome-file-list>
</web-app>

Answer 1

您正在使用RegisterAction

中的此行创建无限循环

ApplicationContext context =
        new ClassPathXmlApplicationContext("spring.xml");

循环是你调用Spring容器，它创建一个RegisterAction，它（如上所示）创建一个Spring容器，它创建一个RegisterAction ....

您不应该直接在Spring Bean中引用ApplicationContext。您应该使用配置（setter或构造函数注入）来设置bean的依赖项。你需要这样做

spring.xml

<bean id="insertUserProfile" class="lotmovement.business.crud.InsertUserProfile"/>

<bean id="registeraction"  class="lotmovement.action.RegisterAction">
  <property name="insertUserProfile" ref="insertUserProfile"/>
</bean>

然后，您将向RegisterAction添加方法setInsertUserProfile。 Spring将使用您的上下文中指定的bean调用setter（在本例中为new insertUserProfile）。您需要对从上下文引用的所有bean执行此操作。

您可能希望对Spring构造函数注入进行一些研究，因为它是注入永远不需要更改的依赖项的“更好”方法。

Answer 2

杰夫的回答很明显。这是对错误和不应该做的事情的一个很好的解释。

您缺少的是在web.xml中注册应用程序上下文：

Loading context in Spring using web.xml

这是纠正，加上杰夫的建议，应该让你在路上。

Answer 3

为什么在使用Struts 2时自己处理Spring容器？你需要Struts 2 Spring插件。

http://struts.apache.org/2.3.4.1/docs/spring-plugin.html

虽然其他答案都很好并且完全描述了这段代码的错误，但我不确定它们是最好的答案。。。 Struts 2提供了Spring集成，它完全被设计为允许您将依赖项无缝地注入到您自己的对象和核心框架对象中，例如操作。

使用Spring插件，您可以使用XML或注释简单地配置Spring bean，就是这样。 Spring容器被集成到框架的核心对象工厂中，这意味着您不必处理它;而这是在这个问题的代码中处理容器造成了toksis的问题。

突然，我的spring.xml将不会实例化我的类并发生错误异常

3 个答案: