#vulnerable code 
                                void failRequestLimitExceeded(Operation request) {
        // Add a header indicating retry should be attempted after some interval.
        // Currently set to just one second, subject to change in the future
        request.addResponseHeader(Operation.RETRY_AFTER_HEADER, "1");
        // a specific ServiceErrorResponse will be added in the future with retry hints
        request.setStatusCode(Operation.STATUS_CODE_UNAVAILABLE)
                .fail(new CancellationException("queue limit exceeded"));
    } 
                            #location 7 
                            #vulnerability type THREAD_SAFETY_VIOLATION
#fixed code
                                ScheduledExecutorService getScheduledExecutor() {
        return this.scheduledExecutor;
    }