I am using eclipes to run my java project and learn java and i install JDK22 correctly and i checked window+prefrences+java+installed JREs+libiraries in my eclipes and i found JDK22 listed and used and i checked the project that i work on it on eclipes and check its build path and i fond JDK listed and used in libiraries part, i will be appreciate if you help me solve this problem.