Exemplo

public class ThreadedClass extends java.lang.Thread { public ThreadedClass () { super (); } public void start () { //.. } public void sleep (long millis) { //.. } }

Solução

Forneça um método run(). public class ThreadedClass extends java.lang.Thread { public ThreadedClass () { super (); } public void start () { //.. } public void sleep (long millis) { //.. } public void run () { //.. } }