#vulnerable code 
                                public static QueryRuntime parse(Query query, ExecutionPlanContext executionPlanContext,
                                     Map<String, AbstractDefinition> streamDefinitionMap,
                                     Map<String, AbstractDefinition> tableDefinitionMap,
                                     Map<String, EventTable> eventTableMap) {
        List<VariableExpressionExecutor> executors = new ArrayList<VariableExpressionExecutor>();
        QueryRuntime queryRuntime;
        Element element = null;
        LatencyTracker latencyTracker = null;
        try {
            element = AnnotationHelper.getAnnotationElement("info", "name", query.getAnnotations());
            if (executionPlanContext.getStatisticsManager()!=null) {
                if (element != null) {
                    String metricName = executionPlanContext.getSiddhiContext().getStatisticsConfiguration().getMatricPrefix() + ".executionplan." + executionPlanContext.getName() + "." + element.getValue();
                    latencyTracker = executionPlanContext.getSiddhiContext()
                            .getStatisticsConfiguration()
                            .getFactory()
                            .createLatencyTracker(metricName, executionPlanContext.getStatisticsManager());
                }
            }
            StreamRuntime streamRuntime = InputStreamParser.parse(query.getInputStream(),
                    executionPlanContext, streamDefinitionMap, tableDefinitionMap, eventTableMap, executors, latencyTracker);

            QuerySelector selector = SelectorParser.parse(query.getSelector(), query.getOutputStream(),
                    executionPlanContext, streamRuntime.getMetaComplexEvent(), eventTableMap, executors);

            boolean isWindow = query.getInputStream() instanceof JoinInputStream;

            if (!isWindow && query.getInputStream() instanceof SingleInputStream) {
                for (StreamHandler streamHandler : ((SingleInputStream) query.getInputStream()).getStreamHandlers()) {
                    if (streamHandler instanceof Window) {
                        isWindow = true;
                        break;
                    }
                }
            }

            OutputRateLimiter outputRateLimiter = OutputParser.constructOutputRateLimiter(query.getOutputStream().getId(),
                    query.getOutputRate(), query.getSelector().getGroupByList().size() != 0, isWindow, executionPlanContext.getScheduledExecutorService());
            outputRateLimiter.init(executionPlanContext, latencyTracker);
            executionPlanContext.addEternalReferencedHolder(outputRateLimiter);

            OutputCallback outputCallback = OutputParser.constructOutputCallback(query.getOutputStream(),
                    streamRuntime.getMetaComplexEvent().getOutputStreamDefinition(), eventTableMap, executionPlanContext);

            QueryParserHelper.reduceMetaComplexEvent(streamRuntime.getMetaComplexEvent());
            QueryParserHelper.updateVariablePosition(streamRuntime.getMetaComplexEvent(), executors);
            QueryParserHelper.initStreamRuntime(streamRuntime, streamRuntime.getMetaComplexEvent());

            selector.setEventPopulator(StateEventPopulatorFactory.constructEventPopulator(streamRuntime.getMetaComplexEvent()));

            queryRuntime = new QueryRuntime(query, executionPlanContext, streamRuntime, selector, outputRateLimiter, outputCallback, streamRuntime.getMetaComplexEvent());

            if (outputRateLimiter instanceof WrappedSnapshotOutputRateLimiter) {
                ((WrappedSnapshotOutputRateLimiter) outputRateLimiter).init(streamRuntime.getMetaComplexEvent().getOutputStreamDefinition().getAttributeList().size(), selector.getAttributeProcessorList(), streamRuntime.getMetaComplexEvent());
            }

        } catch (DuplicateDefinitionException e) {
            if (element != null) {
                throw new DuplicateDefinitionException(e.getMessage() + ", when creating query " + element.getValue(), e);
            } else {
                throw new DuplicateDefinitionException(e.getMessage(), e);
            }
        } catch (RuntimeException e) {
            if (element != null) {
                throw new ExecutionPlanCreationException(e.getMessage() + ", when creating query " + element.getValue(), e);
            } else {
                throw new ExecutionPlanCreationException(e.getMessage(), e);
            }
        }

        return queryRuntime;

    } 
                            #location 39 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                public static QueryRuntime parse(Query query, ExecutionPlanContext executionPlanContext,
                                     Map<String, AbstractDefinition> streamDefinitionMap,
                                     Map<String, AbstractDefinition> tableDefinitionMap,
                                     Map<String, EventTable> eventTableMap) {
        List<VariableExpressionExecutor> executors = new ArrayList<VariableExpressionExecutor>();
        QueryRuntime queryRuntime;
        Element element = null;
        LatencyTracker latencyTracker = null;
        try {
            element = AnnotationHelper.getAnnotationElement("info", "name", query.getAnnotations());
            if (executionPlanContext.getStatisticsManager() != null) {
                if (element != null) {
                    String metricName =
                            executionPlanContext.getSiddhiContext().getStatisticsConfiguration().getMatricPrefix() +
                                    SiddhiConstants.METRIC_DELIMITER + SiddhiConstants.METRIC_INFIX_EXECUTION_PLANS +
                                    SiddhiConstants.METRIC_DELIMITER + executionPlanContext.getName() +
                                    SiddhiConstants.METRIC_DELIMITER + SiddhiConstants.METRIC_INFIX_SIDDHI +
                                    SiddhiConstants.METRIC_DELIMITER + SiddhiConstants.METRIC_INFIX_QUERIES +
                                    SiddhiConstants.METRIC_DELIMITER + element.getValue();
                    latencyTracker = executionPlanContext.getSiddhiContext()
                            .getStatisticsConfiguration()
                            .getFactory()
                            .createLatencyTracker(metricName, executionPlanContext.getStatisticsManager());
                }
            }
            StreamRuntime streamRuntime = InputStreamParser.parse(query.getInputStream(),
                    executionPlanContext, streamDefinitionMap, tableDefinitionMap, eventTableMap, executors, latencyTracker);
            QuerySelector selector = SelectorParser.parse(query.getSelector(), query.getOutputStream(),
                    executionPlanContext, streamRuntime.getMetaComplexEvent(), eventTableMap, executors);
            boolean isWindow = query.getInputStream() instanceof JoinInputStream;
            if (!isWindow && query.getInputStream() instanceof SingleInputStream) {
                for (StreamHandler streamHandler : ((SingleInputStream) query.getInputStream()).getStreamHandlers()) {
                    if (streamHandler instanceof Window) {
                        isWindow = true;
                        break;
                    }
                }
            }

            OutputRateLimiter outputRateLimiter = OutputParser.constructOutputRateLimiter(query.getOutputStream().getId(),
                    query.getOutputRate(), query.getSelector().getGroupByList().size() != 0, isWindow,
                    executionPlanContext.getScheduledExecutorService());
            if (outputRateLimiter != null) {
                outputRateLimiter.init(executionPlanContext, latencyTracker);
            }
            executionPlanContext.addEternalReferencedHolder(outputRateLimiter);

            OutputCallback outputCallback = OutputParser.constructOutputCallback(query.getOutputStream(),
                    streamRuntime.getMetaComplexEvent().getOutputStreamDefinition(), eventTableMap, executionPlanContext);
            QueryParserHelper.reduceMetaComplexEvent(streamRuntime.getMetaComplexEvent());
            QueryParserHelper.updateVariablePosition(streamRuntime.getMetaComplexEvent(), executors);
            QueryParserHelper.initStreamRuntime(streamRuntime, streamRuntime.getMetaComplexEvent());
            selector.setEventPopulator(StateEventPopulatorFactory.constructEventPopulator(streamRuntime.getMetaComplexEvent()));

            queryRuntime = new QueryRuntime(query, executionPlanContext, streamRuntime, selector, outputRateLimiter,
                    outputCallback, streamRuntime.getMetaComplexEvent());

            if (outputRateLimiter instanceof WrappedSnapshotOutputRateLimiter) {
                ((WrappedSnapshotOutputRateLimiter) outputRateLimiter)
                        .init(streamRuntime.getMetaComplexEvent().getOutputStreamDefinition().getAttributeList().size(),
                                selector.getAttributeProcessorList(), streamRuntime.getMetaComplexEvent());
            }
        } catch (DuplicateDefinitionException e) {
            if (element != null) {
                throw new DuplicateDefinitionException(e.getMessage() + ", when creating query " + element.getValue(), e);
            } else {
                throw new DuplicateDefinitionException(e.getMessage(), e);
            }
        } catch (RuntimeException e) {
            if (element != null) {
                throw new ExecutionPlanCreationException(e.getMessage() + ", when creating query " + element.getValue(), e);
            } else {
                throw new ExecutionPlanCreationException(e.getMessage(), e);
            }
        }
        return queryRuntime;
    }