java synchronized- Account Update

[pradeep gamage]

in my project i have to update user account. in account table, there is a accountBalance feild. i have to update it asynchronized way. so I have used ExecutorService Java interface.

ExecutorService executor = Executors.newFixedThreadPool(1);

but some time accountbalance not update correct value. when i remove thread part its work fine. I haven't any idea how i can fix this matter. Please give me Your valuable idea to fix this issue.
Thanks in advance...

[Lanny Gilbert]

Please post more code.. This doesn't show us enough to help you.