Working example on Spring Mediator in WSO2 ESB 4.6.0 - spring

Question

Hi i am working on Spring Mediator in WSO2 ESB 4.6.0, using this and this tutorial
I am getting the Error as follows:
ERROR - SpringMediator Cannot look up Spring configuration conf/sample/resources/spring/springsample.xml
ERROR - SpringMediatorCannot reference application context with key : conf/sample/resources/spring/springsample.xml
Could you please explain me how to solve this.

Answer 1

I got to work this as below,
The class should extends AbstractMediator and override the mediate() method as follows,
package com.test.spring.mediator.workingexampleonspringmediator;
import org.apache.synapse.MessageContext;
import org.apache.synapse.mediators.AbstractMediator;
public class HelloWorld extends AbstractMediator{
private String message;
public void setMessage(String message){
this.message = message;
}
public boolean mediate(MessageContext arg0) {
System.out.println("HELLO "+message);
return true;
}
}
Then place the jar in [ESBHOME]/repository/components/lib folder
In mediate method it prints a message with the argument like HELLO 'arg'
And I added the following file to registry (/_system/config/repository/spring/springtest.xml),
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="springtest" class="com.test.spring.mediator.workingexampleonspringmediator.HelloWorld" singleton="false">
<property name="message"><value>ISURU</value></property>
</bean>
</beans>
My proxy is as follows,
<proxy xmlns="http://ws.apache.org/ns/synapse" name="testSpring" transports="https,http" statistics="disable" trace="disable" startOnLoad="true">
<target>
<inSequence>
<log level="full">
<property name="START" value="__________________________"/>
</log>
<spring:spring xmlns:spring="http://ws.apache.org/ns/synapse" bean="springtest" key="conf:/repository/spring/springtest.xml"/>
<log level="full">
<property name="END" value="______________________"/>
</log>
</inSequence>
</target>
<description></description>
</proxy>
In the proxy you can see the bean=[bean id of the springtest.xml] and class=qualified name of the class
In my ESB terminal, I got the following out put with the given property value in springtest.xml,
[2013-11-07 17:38:30,654] INFO - LogMediator To: /services/testSpring.testSpringHttpSoap12Endpoint, WSAction: urn:mediate, SOAPAction: urn:mediate, MessageID: urn:uuid:bcae82e9-4027-43c5-bd7a-cbfa885aaf33, Direction: request, START = __________________________, Envelope: <?xml version='1.0' encoding='utf-8'?><soapenv:Envelope xmlns:soapenv="http://www.w3.org/2003/05/soap-envelope"><soapenv:Body/></soapenv:Envelope>
HELLO ISURU
[2013-11-07 17:38:30,692] INFO - LogMediator To: /services/testSpring.testSpringHttpSoap12Endpoint, WSAction: urn:mediate, SOAPAction: urn:mediate, MessageID: urn:uuid:bcae82e9-4027-43c5-bd7a-cbfa885aaf33, Direction: request, END = ______________________, Envelope: <?xml version='1.0' encoding='utf-8'?><soapenv:Envelope xmlns:soapenv="http://www.w3.org/2003/05/soap-envelope"><soapenv:Body/></soapenv:Envelope>
You must restart the ESB after placing the jar in repository/components/lib

Answer 2

These are the steps for spring mediator in brief as Isuru explained above
Create spring mediator library by extending AbstractMediator
Copy into ESB_HOME/repository/components/lib
Re-start the server
Register springtest.xml file in the Registry
(http://madhukaudantha.blogspot.com/2012/07/wso2-esb-proxy-from-registry.html up to step 5 as Isuru explained)
Then, create a Custom proxy with Spring Mediator.
In there,
add Bean as “springtest” (defined bean id for the mediator class within the xml file)
Select the Key as where the configuration registry file stored according to the 4th step.
Ex : If you have stored that springtest.xml file into path “_system/config/repository/”
Select Key as “/_system/config/repository/springtest.xml”
Note:
Verify in ESB_HOME/repository/components/dropins folder for OSGI
bundle of the mediator of the created spring mediator library which
is copied into ESB_HOME/repository/components/lib. If it is not there
after restarting server, it may be a problem in created mediator
library.
As well as, put unique package name for the mediator class to avoid
conflicts with other mediator class in
ESB_HOME/repository/components/lib.
Keep in mind to add unique bean id for the .xml file which is
registered in the registry when you registered .xml file in 4th step.

Answer 3

This is because of the esb finds the springsample.xml file in the path repository/conf/sample/resources
<parameter name="root">file:repository/conf/sample/resources/</parameter>
But the springsample.xml file location is in repository/samples/resources/ . Therefore it should be corrected as the following,
<parameter name="root">file:repository/samples/resources/</parameter>
In documentation, the configuration is not correct, If you start the esb by the command wso2esb-samples -sn 470 (as mentioned in the documentation) the esb will load the file in repository/samples/synapse_sample_470.xml where in this file above parameter is correctly configured.
Hope this will solve your problem :)
UPDATED:
According to your comment, as your are directly using sample spring example, this occur due to permission of the file trying to access, Or this can be due to file path error. So please try with absolute file url.

Answer 4

when i send a message, the only error message i got is this one
ERROR - SpringMediator No bean named 'springtest' is defined
so it means, the config file has been found. But what about the instanciation of the bean inside, i cannot see any explicit error. The jar file is in components/lib and i can see it also in dropins folder.
:/