question: public static < V > V executeSynchronously ( Callable < V > c ) { try { final AtomicReference < V > result = new AtomicReference < > ( ) ; final AtomicReference < Exception > err = new AtomicReference < > ( ) ; final CountDownLatch doneLatch = new CountDownLatch ( 1 ) ; final AuthorizationContext context = OperationContext . getAuthorizationContext ( ) ; executor . execute ( null ) ; doneLatch . await ( ) ; Exception ex = err . get ( ) ; if ( ex != null ) { throw ex ; } else { return result . get ( ) ; } } catch ( Exception e ) { if ( e instanceof RuntimeException ) { throw ( RuntimeException ) e ; } else { throw new RuntimeException ( e ) ; } } }
target:  Executes a callable synchronously.