Java classes not displayed in jmeter

I`m new to Jmeter. I`m trying to test my own Java class with jmeter. I have put my class`s jar file in the lib/ext folder of jmeter.
I think i placed all the dependencies also, correclty. In the test plan configuration also, i specifed my jar file in the classpath. Still, my java class is not displayed by Jmeter. When i create the Java request, only two classes are displayed, sleeptest and javatest. Please help me, since i have been trying to test that java class from last week.

Your class needs either implement JavaSamplerClient or extend AbstractJavaSamplerClient and have relevant overrides of required methods.

See WebSocket Testing With Apache JMeter guide for example implementation of WebSocket client via JMeter Java Request Sampler.