MongodbMessageSource in Spring integration is throwing error with no beanFactory - spring-integration

Question

This is my code snippet
#Bean
#ServiceActivator(inputChannel = "topicChannel", outputChannel="responseChannel")
public Employee getEmpDetails() throws Exception {
Expression query = new LiteralExpression("{'name' : '*****'}");
MongoDbMessageSource source = new MongoDbMessageSource(mongoDbFactory(), query);
source.setEntityClass(Employee.class);
source.afterPropertiesSet();
List<Employee> resluts =((List<Employee>)source.receive().getPayload());
return resluts.get(0);
}
Below is the error
java.lang.RuntimeException: No beanfactory
at org.springframework.integration.expression.ExpressionUtils.createStandardEvaluationContext(ExpressionUtils.java:79)
at org.springframework.integration.mongodb.inbound.MongoDbMessageSource.onInit(MongoDbMessageSource.java:176)
at org.springframework.integration.context.IntegrationObjectSupport.afterPropertiesSet(IntegrationObjectSupport.java:150)
at com.gap.si.configuratoin.MongoDBConfiguration.getEmpDetails(MongoDBConfiguration.java:48)
at com.gap.si.configuratoin.MongoDBConfiguration$$EnhancerBySpringCGLIB$$8e22c38.CGLIB$getEmpDetails$3()
at com.gap.si.configuratoin.MongoDBConfiguration$$EnhancerBySpringCGLIB$$8e22c38$$FastClassBySpringCGLIB$$99782c25.invoke()
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:309)
at com.gap.si.configuratoin.MongoDBConfiguration$$EnhancerBySpringCGLIB$$8e22c38.getEmpDetails()
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1119)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1014)
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.integration.config.annotation.AbstractMethodAnnotationPostProcessor.resolveTargetBeanFromMethodWithBeanAnnotation(AbstractMethodAnnotationPostProcessor.java:362)
at org.springframework.integration.config.annotation.ServiceActivatorAnnotationPostProcessor.createHandler(ServiceActivatorAnnotationPostProcessor.java:54)
at org.springframework.integration.config.annotation.AbstractMethodAnnotationPostProcessor.postProcess(AbstractMethodAnnotationPostProcessor.java:117)
at org.springframework.integration.config.annotation.MessagingAnnotationPostProcessor$1.doWith(MessagingAnnotationPostProcessor.java:151)
at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:495)
at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:502)
at org.springframework.integration.config.annotation.MessagingAnnotationPostProcessor.postProcessAfterInitialization(MessagingAnnotationPostProcessor.java:131)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:422)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1579)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)
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.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:686)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:957)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:946)
at com.gap.si.configuratoin.Application.main(Application.java:16)

Answer 1

You should define the MongoDbMessageSource as a #Bean too so that it is properly initialized by the framework; calling afterPropertiesSet() is not enough.
Also, when a #ServiceActivator is a #Bean, the bean type must be MessageHandler. For a POJO #ServiceActivator method, use a #MessageEndoint.