Java 无法转换类型 [com.sun.proxy.$Proxy32 ScopedObject 的值
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时间：2020-08-14 10:10:24 来源:igfitidea点击:
Cannot convert value of type [com.sun.proxy.$Proxy32 ScopedObject
提问by vishal
I am using spring batch, below are the configurations.
我正在使用 spring 批处理，以下是配置。
<beans:bean id="symfonyJob" class="com.st.symfony.Symfony"
p:dir="${symfony.dir}" p:consolePath="${symfony.console.path}"
p:strUtil-ref="strUtil" p:logFilePath="${batch.log.file.path}.#{jobParameters[batch_id]}" scope="step"/>
<beans:bean id="importExchangesItemWriter"
class="com.st.batch.foundation.ImportExchangesItemWriter"
p:symfony-ref="symfonyJob" p:replyTimeout="${import.exchanges.reply.timeout}" scope="step"/>
<beans:bean id="importExchangesFileItemReader"
class="org.springframework.batch.item.file.MultiThreadedFlatFileItemReader"
p:resource="file:${spring.tmp.batch.dir}/#{jobParameters[batch_id]}/exchanges.txt"
p:lineMapper-ref="stLineMapper" p:startAt="#{stepExecutionContext['startAt']}"
p:maxItemCount="#{stepExecutionContext['itemsCount']}" scope="step" />
<step id="importExchangesStep">
<tasklet transaction-manager="transactionManager">
<chunk reader="importExchangesFileItemReader" writer="importExchangesItemWriter"
commit-interval="${import.exchanges.commit.interval}" />
</tasklet>
</step>
<job id="importExchangesJob" restartable="true">
<step id="importExchangesStep.master">
<partition partitioner="importExchangesPartitioner"
handler="importExchangesPartitionHandler" />
</step>
</job>
Everything was working before I change the scope of symfonyJob and importExchangesItemWriter to scope="step". As soon as I changed scope, I am getting
在我将 symfonyJob 和 importExchangesItemWriter 的范围更改为 scope="step" 之前，一切正常。一旦我改变了范围，我就会得到
ERROR: org.springframework.batch.core.step.AbstractStep - Encountered an error executing step importExchangesStep in job importExchangesJob
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.importExchangesItemWriter' defined in file [/home/vishal/install/sts-bundle/vfabric-tc-server-developer-2.9.6.RELEASE/base-instance/wtpwebapps/spring/WEB-INF/classes/META-INF/spring/batch/jobs/foundation/steps/import-exchanges.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'com.sun.proxy.$Proxy32 implementing org.springframework.aop.scope.ScopedObject,java.io.Serializable,org.springframework.aop.framework.AopInfrastructureBean,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised' to required type 'com.st.symfony.Symfony' for property 'symfony'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [com.sun.proxy.$Proxy32 implementing org.springframework.aop.scope.ScopedObject,java.io.Serializable,org.springframework.aop.framework.AopInfrastructureBean,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised] to required type [com.st.symfony.Symfony] for property 'symfony': no matching editors or conversion strategy found
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:532)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:461)
at org.springframework.beans.factory.support.AbstractBeanFactory.getObject(AbstractBeanFactory.java:333)
at org.springframework.batch.core.scope.StepScope.get(StepScope.java:110)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:329)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
at org.springframework.aop.target.SimpleBeanTargetSource.getTarget(SimpleBeanTargetSource.java:34)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:184)
at com.sun.proxy.$Proxy26.write(Unknown Source)
at org.springframework.batch.core.step.item.SimpleChunkProcessor.writeItems(SimpleChunkProcessor.java:175)
at org.springframework.batch.core.step.item.SimpleChunkProcessor.doWrite(SimpleChunkProcessor.java:151)
at org.springframework.batch.core.step.item.SimpleChunkProcessor.write(SimpleChunkProcessor.java:274)
at org.springframework.batch.core.step.item.SimpleChunkProcessor.process(SimpleChunkProcessor.java:199)
at org.springframework.batch.core.step.item.ChunkOrientedTasklet.execute(ChunkOrientedTasklet.java:75)
at org.springframework.batch.core.step.tasklet.TaskletStep$ChunkTransactionCallback.doInTransaction(TaskletStep.java:402)
at org.springframework.batch.core.step.tasklet.TaskletStep$ChunkTransactionCallback.doInTransaction(TaskletStep.java:326)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:131)
at org.springframework.batch.core.step.tasklet.TaskletStep.doInChunkContext(TaskletStep.java:267)
at org.springframework.batch.core.scope.context.StepContextRepeatCallback.doInIteration(StepContextRepeatCallback.java:77)
at org.springframework.batch.repeat.support.RepeatTemplate.getNextResult(RepeatTemplate.java:368)
at org.springframework.batch.repeat.support.RepeatTemplate.executeInternal(RepeatTemplate.java:215)
at org.springframework.batch.repeat.support.RepeatTemplate.iterate(RepeatTemplate.java:144)
at org.springframework.batch.core.step.tasklet.TaskletStep.doExecute(TaskletStep.java:253)
at org.springframework.batch.core.step.AbstractStep.execute(AbstractStep.java:198)
at org.springframework.batch.integration.partition.StepExecutionRequestHandler.handle(StepExecutionRequestHandler.java:64)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.expression.spel.support.ReflectiveMethodExecutor.execute(ReflectiveMethodExecutor.java:69)
at org.springframework.expression.spel.ast.MethodReference$MethodValueRef.getValue(MethodReference.java:97)
at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:81)
at org.springframework.expression.spel.ast.SpelNodeImpl.getTypedValue(SpelNodeImpl.java:102)
at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:103)
at org.springframework.integration.util.AbstractExpressionEvaluator.evaluateExpression(AbstractExpressionEvaluator.java:126)
at org.springframework.integration.util.MessagingMethodInvokerHelper.processInternal(MessagingMethodInvokerHelper.java:227)
at org.springframework.integration.util.MessagingMethodInvokerHelper.process(MessagingMethodInvokerHelper.java:127)
at org.springframework.integration.handler.MethodInvokingMessageProcessor.processMessage(MethodInvokingMessageProcessor.java:73)
at org.springframework.integration.handler.ServiceActivatingHandler.handleRequestMessage(ServiceActivatingHandler.java:67)
at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:134)
at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:73)
at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:115)
at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:102)
at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:77)
at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:157)
at org.springframework.integration.core.MessagingTemplate.doSend(MessagingTemplate.java:288)
at org.springframework.integration.core.MessagingTemplate.doSendAndReceive(MessagingTemplate.java:318)
at org.springframework.integration.core.MessagingTemplate.sendAndReceive(MessagingTemplate.java:239)
at org.springframework.integration.gateway.MessagingGatewaySupport.doSendAndReceive(MessagingGatewaySupport.java:233)
at org.springframework.integration.gateway.MessagingGatewaySupport.sendAndReceiveMessage(MessagingGatewaySupport.java:207)
at org.springframework.integration.amqp.inbound.AmqpInboundGateway.access0(AmqpInboundGateway.java:47)
at org.springframework.integration.amqp.inbound.AmqpInboundGateway.onMessage(AmqpInboundGateway.java:87)
at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:693)
at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:586)
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access<bean id="myEntityDAO" class="com.me.etc.MyEntityDAOImpl" parent="hibernateDAO"/>
<bean id="myEntityService class="com.me.etc.MyEntityServiceImpl">
<property name="myEntityDAO" ref="myEntityDAO" />
</bean>
1(SimpleMessageListenerContainer.java:75)
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.invokeListener(SimpleMessageListenerContainer.java:154)
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.invokeListener(SimpleMessageListenerContainer.java:1113)
at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.executeListener(AbstractMessageListenerContainer.java:559)
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.doReceiveAndExecute(SimpleMessageListenerContainer.java:904)
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.receiveAndExecute(SimpleMessageListenerContainer.java:888)
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access0(SimpleMessageListenerContainer.java:75)
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:989)
at java.lang.Thread.run(Thread.java:724)
Caused by: org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'com.sun.proxy.$Proxy32 implementing org.springframework.aop.scope.ScopedObject,java.io.Serializable,org.springframework.aop.framework.AopInfrastructureBean,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised' to required type 'com.st.symfony.Symfony' for property 'symfony'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [com.sun.proxy.$Proxy32 implementing org.springframework.aop.scope.ScopedObject,java.io.Serializable,org.springframework.aop.framework.AopInfrastructureBean,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised] to required type [com.st.symfony.Symfony] for property 'symfony': no matching editors or conversion strategy found
at org.springframework.beans.BeanWrapperImpl.convertIfNecessary(BeanWrapperImpl.java:463)
at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:494)
at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:488)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1437)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1396)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1132)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:522)
... 62 more
Caused by: java.lang.IllegalStateException: Cannot convert value of type [com.sun.proxy.$Proxy32 implementing org.springframework.aop.scope.ScopedObject,java.io.Serializable,org.springframework.aop.framework.AopInfrastructureBean,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised] to required type [com.st.symfony.Symfony] for property 'symfony': no matching editors or conversion strategy found
at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:264)
at org.springframework.beans.BeanWrapperImpl.convertIfNecessary(BeanWrapperImpl.java:448)
... 68 more
It was working even though reader had scope step but as soon as I add it to writer, I started getting this error.
即使读者有范围步骤，它也能正常工作，但是一旦我将它添加到作者，我就开始收到此错误。
回答by Luca Basso Ricci
You need to expose <aop:scoped-proxy proxy-target-class="true" />for symfonyJob bean because standard proxy creation expose interfaces and not concrete class (as you need,because ImportExchangesItemWriter.setSymfony()accept - for sure - a com.st.symfony.Symfonyparameter and not an interface).
You can have more info about proxy creation mechanisms googling for "aop proxytargetclass".
您需要<aop:scoped-proxy proxy-target-class="true" />为 symfonyJob bean公开，因为标准代理创建公开接口而不是具体类（根据您的需要，因为ImportExchangesItemWriter.setSymfony()接受 - 当然 -com.st.symfony.Symfony参数而不是接口）。
您可以通过谷歌搜索“aop proxytargetclass”获得有关代理创建机制的更多信息。
回答by Jim Ford
I saw this error with a slightly different scenario:
我看到这个错误的场景略有不同：
I did not follow the proper pattern for HibernateDAO bean, it required interface with methods and to pass the interface type in to the service layer spring bean as property instead of the DAO implementation class.
我没有遵循 HibernateDAO bean 的正确模式，它需要与方法的接口，并将接口类型作为属性而不是 DAO 实现类传递给服务层 spring bean。
applicationContext.xml
应用上下文.xml
class MyEntityServiceImpl extends MyEntityService {
.
.
.
// I got the error when I had this property of class MyEntityDAOImpl
private MyEntityDAOInterface myEntityDAO;
// changed the setter as well to match
@Required
public setMyEntityDAO(MyEntityDAOInterface myEntityDAO) {
this.myEntityDAO = myEntityDAO;
}
.
.
.
}
MyEntityServiceImpl.java
MyEntityServiceImpl.java
##代码##Spring wanted the interface to pass in, instead of the implemented class file which caused the "Cannot convert value of type" error.
Spring希望传入接口，而不是导致“无法转换类型值”错误的已实现类文件。
