Hi Mostafa,
mmm... that Full GC only takes 0.9427300 secs !! where's the problem? ;) hehehehe... FullGCs are not a problem if they're not impacting on the user's response time. Just start the server and run some stress testing to check the heap performance of your application ( I remember of having FullGCs of 10 seconds in some stress testing, so it was really a huuuuuuge "little" problem ! however, it was finally solved by "playing" with some jvm parameters )
take care!