问题
I've created a Class Mediator in which I want to intersect two policies. I've created the Class Mediator with Carbon Studio for Eclipse, which automatically adds some predefined libs to the build path of my project.
One of the libs is neethi-2.0.4.wso2v1.jar.
If I want to use the intersect-method I get an exception. If I have a look at the source I see that the intersect-method just throws an "UnsupportedOperationException".
So the given neethi lib is useless for intersection, therefore I want to use the newest Neethi lib (aka neethi-3.0.2.lib) for intersection inside my class mediator.
Could you tell me how I can include third party libs, especially in my use case these ones, that should override the once used inside the esb( neethi-2.0.4.wso2v1.jar).
Thanks
回答1:
Developer Studio adds these libs to your project classpath, so that developers do not get build errors in the source code.
Therefore those libraries are only for the development time and available only with Dev Studio. They are not the libraries used in the runtime of the server.
Runtime libraries are provided by the WSO2 Carbon Server runtime. So this UnsupportedOperationException is thrown by the server is occurred due to the version of the neethi in the server does not support it. So you need to upgrade the library in the server runtime.
But as you can see, WSO2 have forked the neethi codebase and have some custom implementations on the forked source. So IMO, simply upgrading the version would not help.
Anyway you need to actually upgrade the library and see whether you face any issues with it.
To upgrade the versions, you can either create a Java Library artifact for newer Neethi library and include it in the CAR file and deploy the CAR file or copy the new Neethi library to <CARBON_HOME>/repository/components/lib location while the server is running.
You can find the current Neethi library in the <CARBON_HOME>/repository/components/plugins location. If you find some error or exception similar to "Linkage Error", then try to remove the older version of the library. But it would cause some other exceptions.
So IMO the bottom line is, you will face some issues with the version upgrade. But yes of course you can give a try and see, whether we can overcome them. Give it a try and post your observations here. We will try our best to assist you.
来源：https://stackoverflow.com/questions/11845135/do-policy-intersection-in-wso2esb-class-mediator