Jmeter: javaRequest issue

I have a class from which I am sending request to remote server and getting response.

The type of content is application/json.

My class extends from AbstractJavaSamplerClient, and I have override 4 methods.

I have made jar file from this and past it in jakarta-jmeter-2.4/lib/ext folder.

When I press "Run" I get an exception and I find out the its come from my JSONObject.

When I added comments in front of that object I get exception in objects connected with HTTPRequest.

I have downloaded packages fro开发者_Python百科m here and past jar files into /ext folder. But that didn't get me some result.

Thanks for your help.