Help with ThreadLocal

Hi Expert programmers please help me out with a ThreadLocal Query.

private static final ThreadLocal cache = new ThreadLocal() {
protected ConnectioninitialValue() {
return ConnectionPool.getConnection()
}
};

Calling Get on the cache returns a cached connection per thread. If the call is for the first time from same thread it returns same connection. Sweet.

Issue 1
When the client gets the connection it cannot close it (If the client close the connection all the subsequent get will return the closed Connection).

Issue 2
If the connection gets timed out the subsequent get will return closed connection.

Issue 3
If you get teh connection don't close it. How to you gracefully close the connection in the above implementation upon garbage collection when Thread goes out of scope.

Any takers.