Why Java examples for JCE SDK5 generate KeyPair to encrypt data?

My understanding is, Private Key should never leave HSM cluster. HSM-Client should pass key-handle, Mechanism and payload to the HSM-Server and HSM-Server should encrypt or sign the payload and give it back to the HSM-Client. But the examples in the official documentation generates KeyPair and use actual PrivateKey to encrypt. Please let me know if my understanding is correct and point me to some Java example where encryption and signing happens on HSM-Server and not on HSM-Client