output: #fixed code
                                  public void commit(Transaction transaction) throws RollbackException, TransactionException {
          if (LOG.isTraceEnabled()) {
              LOG.trace("commit " + transaction);
          }
          if (transaction.getStatus() != Status.RUNNING) {
              throw new IllegalArgumentException("Transaction has already been " + transaction.getStatus());
          }
  
          // Check rollbackOnly status
          if (transaction.isRollbackOnly()) {
              rollback(transaction);
              throw new RollbackException();
          }
  
          // Flush all pending writes
          if (!flushTables(transaction)) {
              cleanup(transaction);
              throw new RollbackException();
          }
  
          SyncCommitCallback cb = new SyncCommitCallback();
          TimerContext commitTimer = tsoclient.getMetrics().startTimer(Timers.COMMIT);
          try {
              tsoclient.commit(transaction.getStartTimestamp(), transaction.getRows(), cb);
              cb.await();
          } catch (Exception e) {
              throw new TransactionException("Could not commit", e);
          } finally {
              commitTimer.stop();
          }
          if (cb.getException() != null) {
              throw new TransactionException("Error committing", cb.getException());
          }
  
          if (LOG.isTraceEnabled()) {
              LOG.trace("doneCommit " + transaction.getStartTimestamp() + " TS_c: " + cb.getCommitTimestamp()
                      + " Success: " + (cb.getResult() == TSOClient.Result.OK));
          }
  
          if (cb.getResult() == TSOClient.Result.ABORTED) {
              cleanup(transaction);
              throw new RollbackException();
          }
          transaction.setStatus(Status.COMMITTED);
          transaction.setCommitTimestamp(cb.getCommitTimestamp());
      }
input: #vulnerable code 
                                  public void commit(Transaction transaction) throws RollbackException, TransactionException {
          if (LOG.isTraceEnabled()) {
              LOG.trace("commit " + transaction);
          }
  
          // Check rollbackOnly status
          if (transaction.isRollbackOnly()) {
              rollback(transaction);
              throw new RollbackException();
          }
  
          // Flush all pending writes
          if (!flushTables(transaction)) {
              cleanup(transaction);
              throw new RollbackException();
          }
  
          SyncCommitCallback cb = new SyncCommitCallback();
          TimerContext commitTimer = tsoclient.getMetrics().startTimer(Timers.COMMIT);
          try {
              tsoclient.commit(transaction.getStartTimestamp(), transaction.getRows(), cb);
              cb.await();
          } catch (Exception e) {
              throw new TransactionException("Could not commit", e);
          } finally {
              commitTimer.stop();
          }
          if (cb.getException() != null) {
              throw new TransactionException("Error committing", cb.getException());
          }
  
          if (LOG.isTraceEnabled()) {
              LOG.trace("doneCommit " + transaction.getStartTimestamp() + " TS_c: " + cb.getCommitTimestamp()
                      + " Success: " + (cb.getResult() == TSOClient.Result.OK));
          }
  
          if (cb.getResult() == TSOClient.Result.ABORTED) {
              cleanup(transaction);
              throw new RollbackException();
          }
          transaction.setCommitTimestamp(cb.getCommitTimestamp());
      } 
                              #location 21 
                              #vulnerability type THREAD_SAFETY_VIOLATION