wso2 custom mediator inside carbon app - esb

Question

I developed a custom mediator and its corresponding Factory/Serializer classes so that I can configure complex configuration options for it inside a sequence. This was made with a carbon app project using carbon studio.
The thing is that the only way I can make the configuration element to work is by deploying the jar file outside the .car file.
Can I just deploy the .car file to make it work? Where do I have to put the META-INF/services folder in order to work properly?
Here's my CarbonAppProject structure
CarbonApp
+--artifacts
+--lib
+--library
+--bundle
+--jXLS <-- Java Library Artifact
+--synapse
+--mediator
+--XlsToObjectMediator <-- Custom Mediator Artifact
+--builder
+--META-INF
+--services
+--org.apache.synapse.config.xml.MediatorFactory <-- FILE
+--org.apache.synapse.config.xml.MediatorSerializer <-- FILE
+--src
+--main
+--java
+--<package> <-- mediator, factory and serializer clases
Any help will be much appreciated.

Answer 1

You cannot get this to work with this version of Carbon Studio but it is possible to get it work with newer version of it. You can get the newer version from http://builder1.us1.wso2.org/~developerstudio/developer-studio/2.0.0/RC1/wso2-developer-studio_2.0.0.RC1.zip
Steps.
Create a ESB Custom mediator project and create your mediator sources there
Copy the META-INF/services folder to the src/main/resources folder of the same project.
Build the Custom Mediator project with Maven
Create a Java Library Artifact project and make sure to add jXLS library to it.
Build the Java Library Artifact Project with Maven
Create Carbon Application Project
Add the Custom Mediator Project and Java Library Artifact project as dependencies of the Carbon Application Project.
Build the C-App project with Maven
Now you will be able to get the ESB Custom Mediator running in ESB without any issue.
.
|-- pom.xml
`-- src
`-- main
|-- java
| `-- ddd
| `-- dd.java
`-- resources
`-- META-INF
`-- services
|-- org.apache.synapse.config.xml.MediatorFactory
`-- org.apache.synapse.config.xml.MediatorSerializer
Your mediator project structure would be similar to above
Hope this helps!!
Thankss.
/Harshana

Answer 2

I don't think declaring a project level dependency between JavaLibraryArtifact project and Custom mediator project will solve this.
But you can achieve this by adding the dependency to the actual 3rd Party Library from the mediator project.
Steps:
Right click on the Custom mediator project, select Build Path -> Configure Build Path
Go to Libraries Tab and Select "Add Jars" button. This will populate the Project Browser dialog
Expand the JavaLibraryArtifact Project in the Project Browser and select the jXLS library from the file list in there and click on "Ok"
Now you have added the jXLS to your Custom mediator project buildpath. So you won't see any errors in your Custom Mediator project.
If you open the .Classpath file of the Custom mediator project, you will see an entry similar to following.
<classpathentry kind="lib" path="/JavaLibArtifactProject/jXLS.jar"/>
To avoid compilation errors from Maven, you need to add a Dependency to jXLS library in the Custom mediator project pom.xml.
By following the above steps you can avoid duplicating the JXLS library in your projects.
Hope this helps!!
Thanks.
/Harshana