Java Request Sampler in Jmeter

How to write a custom Java Class and use it as part of Java Request in Jmeter

1.

reference – http://henry-tech-notes.blogspot.com/2006/10/testing-hessian-services-with-jmeter.html

How to use SampleResult in Java Request / Why its required

reference – http://stackoverflow.com/questions/2379688/testing-java-classes-with-jmeter