Spring integration:imap - error: Target object of type [class myEmailReciever] has no eligible methods for handling Messages - spring

Question

I'm trying to use spring integration email mechanism.
I used this link for reference:
http://blog.solidcraft.eu/2011/04/read-emails-from-imap-with-spring.html
unfortunately i get an error message on server start-up:
Caused by: java.lang.IllegalArgumentException: Target object of type [class src.com.project.myEmailReciever] has no eligible methods for handling Messages.
at org.springframework.util.Assert.notEmpty(Assert.java:294)
at org.springframework.integration.util.MessagingMethodInvokerHelper.findHandlerMethodsForTarget(MessagingMethodInvokerHelper.java:348)
at org.springframework.integration.util.MessagingMethodInvokerHelper.<init>(MessagingMethodInvokerHelper.java:165)
at org.springframework.integration.util.MessagingMethodInvokerHelper.<init>(MessagingMethodInvokerHelper.java:103)
at org.springframework.integration.util.MessagingMethodInvokerHelper.<init>(MessagingMethodInvokerHelper.java:107)
at org.springframework.integration.handler.MethodInvokingMessageProcessor.<init>(MethodInvokingMessageProcessor.java:48)
at org.springframework.integration.handler.ServiceActivatingHandler.<init>(ServiceActivatingHandler.java:42)
at org.springframework.integration.config.ServiceActivatorFactoryBean.createMethodInvokingHandler(ServiceActivatorFactoryBean.java:48)
at org.springframework.integration.config.AbstractStandardMessageHandlerFactoryBean.createHandler(AbstractStandardMessageHandlerFactoryBean.java:72)
at org.springframework.integration.config.AbstractSimpleMessageHandlerFactoryBean.createHandlerInternal(AbstractSimpleMessageHandlerFactoryBean.java:89)
at org.springframework.integration.config.AbstractSimpleMessageHandlerFactoryBean.getObject(AbstractSimpleMessageHandlerFactoryBean.java:68)
at org.springframework.integration.config.AbstractSimpleMessageHandlerFactoryBean.getObject(AbstractSimpleMessageHandlerFactoryBean.java:31)
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:142)
... 30 more
apparently the function in my receiving class :
public void receive(MimeMessage mimeMessage) {
//doSomthing
}
is not eligible for handling emails.. anyone know how do i solve this?
edit here are my classes\ xml's:
#Component
#Scope("prototype")
public class MessageFactory {
#Autowired
private ApplicationContext ctx;
private static final Logger logger = LoggerFactory.getLogger(MessageFactory.class);
ObjectMapper mapper = new ObjectMapper();
public boolean receive(MimeMessage mimeMessage) {
System.out.println("try");
return true;
}
}
xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mail="http://www.springframework.org/schema/integration/mail"
xmlns:int="http://www.springframework.org/schema/integration"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/integration/mail
http://www.springframework.org/schema/integration/mail/spring-integration-mail-2.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsd">
<util:properties id="javaMailProperties">
<prop key="mail.imap.socketFactory.class">javax.net.ssl.SSLSocketFactory</prop>
<prop key="mail.imap.socketFactory.fallback">false</prop>
<prop key="mail.store.protocol">imaps</prop>
<prop key="mail.debug">true</prop>
</util:properties>
<mail:inbound-channel-adapter id="imapAdapter"
store-uri="imaps://username:password#imap.googlemail.com:993/INBOX"
channel="recieveEmailChannel"
should-delete-messages="false"
should-mark-messages-as-read="true"
auto-startup="true"
java-mail-properties="javaMailProperties">
<int:poller fixed-delay="5" time-unit="SECONDS" />
</mail:inbound-channel-adapter>
<int:channel id="recieveEmailChannel">
<int:interceptors>
<int:wire-tap channel="logger"/>
</int:interceptors>
</int:channel>
<int:logging-channel-adapter id="logger" level="DEBUG"/>
<int:service-activator input-channel="recieveEmailChannel" ref="messageFactory" method="receive"/>
<bean id="messageFactory" class="src.com.project.service.factories.MessageFactory">
</bean>

Answer 1

This error generally is a configuration problem.
Conditions that might cause it include...
Misspelled method attribute in the <service-activator/> configuration
The method's not public
requires-reply="true" and the method returns void (like yours)

Answer 2

I am using Spring Integration 2.2.4 and I was having this problem. I saw another post that said that #Header does not work in some versions of Spring Integration. Unfortunately, I can't upgrade right now. So, the choices were to try using #Headers or use an expression. I used an expression and it is working for me...
<service-activator expression="#myService.serviceMethod(headers.customerKey, payload)"/>