问题
I'm trying to develop a SQS Listener which runs in background and reads message from AWS SQS whenever a new message arrives and it should never delete the message, since there will be a separate process for deleting message.
This is a standalone application, just started developing. But not able to proceed further since the basic thing is not working. I'm sure I'm missing something. I am using spring-cloud-aws-messaging (version: 1.2.0.BUILD-SNAPSHOT).
It's a very simple standalone application, having below files: One spring config file: application-context.xml (content already pasted above) One SQS Listener: SBSQSMessageListener (content already pasted above) One main program which is loading the application-context.xml & creating ApplicationContext
My Spring config file:
<aws-context:context-region region="us-west-2"/>
<aws-context:context-credentials>
<aws-context:simple-credentials access-key="xxxxxxx" secret-key="xxxxxxxxxxxxx" />
</aws-context:context-credentials>
<aws-messaging:queue-messaging-template id="queueMessagingTemplate" />
<aws-messaging:annotation-driven-queue-listener task-executor="simpleTaskExecutor" />
<bean id="simpleTaskExecutor" class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
<property name="corePoolSize" value="4" />
<property name="maxPoolSize" value="10" />
<property name="queueCapacity" value="1" />
<property name="WaitForTasksToCompleteOnShutdown" value="true" />
</bean>
My SQSListener:
package sb.aws.sqs.listener;
import java.util.concurrent.ExecutionException;
import org.apache.log4j.Logger;
import org.springframework.cloud.aws.messaging.config.annotation.EnableSqs;
import org.springframework.cloud.aws.messaging.listener.annotation.SqsListener;
import org.springframework.cloud.aws.messaging.listener.Acknowledgment;
import org.springframework.cloud.aws.messaging.listener.SqsMessageDeletionPolicy;
import org.springframework.messaging.handler.annotation.MessageMapping;
import org.springframework.stereotype.Component;
@Component
@EnableSqs
public class SBSQSMessageListener {
final static Logger logger = Logger.getLogger(SBSQSMessageListener.class);
@MessageMapping("sb-sqs-queue1")
@SqsListener(value = "sb-sqs-queue1", deletionPolicy = SqsMessageDeletionPolicy.NEVER)
public void receive(String message, Acknowledgment acknowledgment) {
System.out.println("Inside receive: " + message);
try {
acknowledgment.acknowledge().get();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ExecutionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
I'm getting below exception:
DT:02/17/2017 15:20:20 LL:DEBUG hostname: storeId: txnId: CL:DefaultListableBeanFactory MSG:Creating shared instance of singleton bean 'simpleMessageListenerContainer' DT:02/17/2017 15:20:20 LL:DEBUG hostname: storeId: txnId: CL:DefaultListableBeanFactory MSG:Creating instance of bean 'simpleMessageListenerContainer' DT:02/17/2017 15:20:20 LL:DEBUG hostname: storeId: txnId: CL:DefaultListableBeanFactory MSG:Returning cached instance of singleton bean 'org.springframework.cloud.aws.messaging.config.annotation.SqsConfiguration' DT:02/17/2017 15:20:20 LL:DEBUG hostname: storeId: txnId: CL:DefaultListableBeanFactory MSG:Returning cached instance of singleton bean 'amazonSQSAsync' DT:02/17/2017 15:20:20 LL:DEBUG hostname: storeId: txnId: CL:DefaultListableBeanFactory MSG:Creating shared instance of singleton bean 'amazonSQS' DT:02/17/2017 15:20:20 LL:DEBUG hostname: storeId: txnId: CL:DefaultListableBeanFactory MSG:Creating instance of bean 'amazonSQS' DT:02/17/2017 15:20:20 LL:DEBUG hostname: storeId: txnId: CL:DefaultListableBeanFactory MSG:Returning cached instance of singleton bean 'org.springframework.cloud.aws.messaging.config.annotation.SqsClientConfiguration' DT:02/17/2017 15:20:21 LL:DEBUG hostname: storeId: txnId: CL:DefaultListableBeanFactory MSG:Eagerly caching bean 'amazonSQS' to allow for resolving potential circular references DT:02/17/2017 15:20:21 LL:DEBUG hostname: storeId: txnId: CL:DefaultListableBeanFactory MSG:Finished creating instance of bean 'amazonSQS' Exception in thread "main" org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'simpleMessageListenerContainer' defined in class path resource [org/springframework/cloud/aws/messaging/config/annotation/SqsConfiguration.class]: Unsatisfied dependency expressed through constructor argument with index 0 of type [com.amazonaws.services.sqs.AmazonSQSAsync]: : No qualifying bean of type [com.amazonaws.services.sqs.AmazonSQSAsync] is defined: expected single matching bean but found 2: amazonSQSAsync,amazonSQS; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [com.amazonaws.services.sqs.AmazonSQSAsync] is defined: expected single matching bean but found 2: amazonSQSAsync,amazonSQS at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749) at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:464) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1111) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1006) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480) at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:139) at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:93) at sb.aws.sqs.SBSQSMain.main(SBSQSMain.java:14) Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [com.amazonaws.services.sqs.AmazonSQSAsync] is defined: expected single matching bean but found 2: amazonSQSAsync,amazonSQS at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1054) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:942) at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:813) at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:741) ... 15 more
Please could you guide me if I'm missing anything?
Many Thanks.
来源：https://stackoverflow.com/questions/42160399/not-able-to-read-messages-from-sqs-using-sqslistener