Spring AOP代理类生成错误

最新推荐文章于 2024-07-30 12:48:07 发布

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最新推荐文章于 2024-07-30 12:48:07 发布

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分类专栏： spring 错误记录文章标签： Spring AOP错误

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本文详细解析了在SSH框架整合过程中遇到的Spring AOP代理类生成错误，探讨了切点表达式设置不当导致的问题，并提供了两种解决方案：一是通过cglib生成代理对象，二是调整切点表达式。

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在整合的ssh时出现一个Spring AOP代理类生成的错误，问题出现在配置事务的时候，切面表达式写的范围太大，导致执行Spring事务时候生成代理类时出现了一个错误

项目目录

配置文件

    <!-- 导入外部文件 -->
    <context:property-placeholder location="classpath:db.properties"/>
    
    
    <context:component-scan base-package="zhuojing.ssh"></context:component-scan>
    
    
    <!-- 配置数据源 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
       <property name="user" value="${jdbc.username}"></property>
       <property name="password" value="${jdbc.password}"></property>
       <property name="driverClass" value="${jdbc.classDriver}"></property>
       <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
 
       <property name="initialPoolSize" value="${jdbc.initPoolSize}"></property>
       <property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property>
       
    </bean>


   <!-- 配置SessionFactory -->
	<bean id="sessionFactory"
		class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
		<property name="dataSource" ref="dataSource"></property>
		<property name="configLocation"
			value="classpath:hibernate.cfg.xml">
		</property>
		<property name="mappingLocations" value="classpath:zhuojing/ssh/entites/*.hbm.xml"></property>
	</bean>
	
	<!-- 配置声明式事务 -->
	<!-- 配置事务管理器 -->
	<bean id="transactionManager"
		class="org.springframework.orm.hibernate4.HibernateTransactionManager">
		<property name="sessionFactory" ref="sessionFactory" />
	</bean>
	
	
	<tx:annotation-driven transaction-manager="transactionManager" />
	
	<!-- 配置事务属性 -->
	<tx:advice transaction-manager="transactionManager" id="txAdvice">
	   <tx:attributes>
          <tx:method name="get*" read-only="true"/>
          <tx:method name="lastNameRigntOr" read-only="true"/>
          <tx:method name="*"/>
	   </tx:attributes>
	</tx:advice>
	
	<!-- 配置切点 -->
	<aop:config>
	    <aop:pointcut expression="execution(* zhuojing.ssh.service.*.*(..))" id="txPoint"/>
	    <aop:advisor advice-ref="txAdvice" pointcut-ref="txPoint"/>
	    
	</aop:config>

出现的错误：

java.lang.NoSuchMethodException: com.sun.proxy.$Proxy19.list()
	ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1246)
	ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)
	com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117)
	com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108)
	ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1369)
	ognl.ASTMethod.getValueBody(ASTMethod.java:90)
	ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
	ognl.SimpleNode.getValue(SimpleNode.java:258)
	ognl.Ognl.getValue(Ognl.java:494)
	ognl.Ognl.getValue(Ognl.java:458)
	com.opensymphony.xwork2.ognl.OgnlUtil$2.execute(OgnlUtil.java:309)
	com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecute(OgnlUtil.java:340)
	com.opensymphony.xwork2.ognl.OgnlUtil.getValue(OgnlUtil.java:307)
	com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:423)
	com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:287)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:250)
	com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:167)
	com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
	com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
	org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:76)
	com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
	com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
	com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)
	com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
	com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)
	com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
	com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
	org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:253)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
	com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
	com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
	com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
	com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
	org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
	com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)
	com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
	org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
	org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept(DateTextFieldInterceptor.java:125)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
	org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
	com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:139)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
	com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
	com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
	org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
	org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:564)
	org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:81)
	org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)

分析错误：

Spring 生成代理对象方式有两种

1:利用jdk中的proxy实现,要求我们的被代理对象必须要去实现一个代理接口，代理对象和被代理对象本质是是实现了统一接口的两个对象（默认方式）

2:利用cglib来实现.被代理对象不需要去实现一个代理接口，被代理类和代理类之间本质是父子类的关系

proxy-target-class="true" 是指定由cglib来实现实现代理.

而在上面配置的方式中切点表达式设为execution(* zhuojing.ssh.*.*.*(..))则Action也会在事务的切面中，并且Action并有实现一个代理接口，
当使用jdk生成代理对象时会出现ava.lang.NoSuchMethodException: com.sun.proxy.$Proxy42.list()的错误，

解决方式：

1.加入：<aop:aspectj-autoproxy proxy-target-class="true" /> 利用cglib来生成代理对象

2.修改切点表达式execution(* zhuojing.ssh.service.*.*(..))