#vulnerable code 
                                public void debugHeader() {
        if (!traceDebugEnabled) {
            return;
        }

        System.out.println("---------------- Trace Information ---------------");
        String traceId = getTraceId();
        String spanId = getSpanId();
        System.out.println(DiscoveryConstant.TRACE_ID + "=" + (StringUtils.isNotEmpty(traceId) ? traceId : StringUtils.EMPTY));
        System.out.println(DiscoveryConstant.SPAN_ID + "=" + (StringUtils.isNotEmpty(spanId) ? spanId : StringUtils.EMPTY));
        System.out.println(DiscoveryConstant.N_D_SERVICE_GROUP + "=" + strategyContextHolder.getHeader(DiscoveryConstant.N_D_SERVICE_GROUP));
        System.out.println(DiscoveryConstant.N_D_SERVICE_TYPE + "=" + strategyContextHolder.getHeader(DiscoveryConstant.N_D_SERVICE_TYPE));
        System.out.println(DiscoveryConstant.N_D_SERVICE_ID + "=" + strategyContextHolder.getHeader(DiscoveryConstant.N_D_SERVICE_ID));
        System.out.println(DiscoveryConstant.N_D_SERVICE_ADDRESS + "=" + strategyContextHolder.getHeader(DiscoveryConstant.N_D_SERVICE_ADDRESS));
        System.out.println(DiscoveryConstant.N_D_SERVICE_VERSION + "=" + strategyContextHolder.getHeader(DiscoveryConstant.N_D_SERVICE_VERSION));
        System.out.println(DiscoveryConstant.N_D_SERVICE_REGION + "=" + strategyContextHolder.getHeader(DiscoveryConstant.N_D_SERVICE_REGION));
        System.out.println(DiscoveryConstant.N_D_SERVICE_ENVIRONMENT + "=" + strategyContextHolder.getHeader(DiscoveryConstant.N_D_SERVICE_ENVIRONMENT));

        String routeVersion = strategyContextHolder.getHeader(DiscoveryConstant.N_D_VERSION);
        if (StringUtils.isNotEmpty(routeVersion)) {
            System.out.println(DiscoveryConstant.N_D_VERSION + "=" + routeVersion);
        }
        String routeRegion = strategyContextHolder.getHeader(DiscoveryConstant.N_D_REGION);
        if (StringUtils.isNotEmpty(routeRegion)) {
            System.out.println(DiscoveryConstant.N_D_REGION + "=" + routeRegion);
        }
        String routeAddress = strategyContextHolder.getHeader(DiscoveryConstant.N_D_ADDRESS);
        if (StringUtils.isNotEmpty(routeAddress)) {
            System.out.println(DiscoveryConstant.N_D_ADDRESS + "=" + routeAddress);
        }
        String routeVersionWeight = strategyContextHolder.getHeader(DiscoveryConstant.N_D_VERSION_WEIGHT);
        if (StringUtils.isNotEmpty(routeVersionWeight)) {
            System.out.println(DiscoveryConstant.N_D_VERSION_WEIGHT + "=" + routeVersionWeight);
        }
        String routeRegionWeight = strategyContextHolder.getHeader(DiscoveryConstant.N_D_REGION_WEIGHT);
        if (StringUtils.isNotEmpty(routeRegionWeight)) {
            System.out.println(DiscoveryConstant.N_D_REGION_WEIGHT + "=" + routeRegionWeight);
        }

        Map<String, String> customizationMap = getCustomizationMap();
        if (MapUtils.isNotEmpty(customizationMap)) {
            for (Map.Entry<String, String> entry : customizationMap.entrySet()) {
                System.out.println(entry.getKey() + "=" + entry.getValue());
            }
        }
        System.out.println("--------------------------------------------------");
    } 
                            #location 42 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                public void debugHeader() {
        if (!traceDebugEnabled) {
            return;
        }

        System.out.println("---------------- Trace Information ---------------");
        String traceId = getTraceId();
        String spanId = getSpanId();
        System.out.println(DiscoveryConstant.TRACE_ID + "=" + (StringUtils.isNotEmpty(traceId) ? traceId : StringUtils.EMPTY));
        System.out.println(DiscoveryConstant.SPAN_ID + "=" + (StringUtils.isNotEmpty(spanId) ? spanId : StringUtils.EMPTY));
        System.out.println(DiscoveryConstant.N_D_SERVICE_GROUP + "=" + strategyContextHolder.getHeader(DiscoveryConstant.N_D_SERVICE_GROUP));
        System.out.println(DiscoveryConstant.N_D_SERVICE_TYPE + "=" + strategyContextHolder.getHeader(DiscoveryConstant.N_D_SERVICE_TYPE));
        System.out.println(DiscoveryConstant.N_D_SERVICE_ID + "=" + strategyContextHolder.getHeader(DiscoveryConstant.N_D_SERVICE_ID));
        System.out.println(DiscoveryConstant.N_D_SERVICE_ADDRESS + "=" + strategyContextHolder.getHeader(DiscoveryConstant.N_D_SERVICE_ADDRESS));
        System.out.println(DiscoveryConstant.N_D_SERVICE_VERSION + "=" + strategyContextHolder.getHeader(DiscoveryConstant.N_D_SERVICE_VERSION));
        System.out.println(DiscoveryConstant.N_D_SERVICE_REGION + "=" + strategyContextHolder.getHeader(DiscoveryConstant.N_D_SERVICE_REGION));
        System.out.println(DiscoveryConstant.N_D_SERVICE_ENVIRONMENT + "=" + strategyContextHolder.getHeader(DiscoveryConstant.N_D_SERVICE_ENVIRONMENT));

        String routeVersion = strategyContextHolder.getHeader(DiscoveryConstant.N_D_VERSION);
        if (StringUtils.isNotEmpty(routeVersion)) {
            System.out.println(DiscoveryConstant.N_D_VERSION + "=" + routeVersion);
        }
        String routeRegion = strategyContextHolder.getHeader(DiscoveryConstant.N_D_REGION);
        if (StringUtils.isNotEmpty(routeRegion)) {
            System.out.println(DiscoveryConstant.N_D_REGION + "=" + routeRegion);
        }
        String routeAddress = strategyContextHolder.getHeader(DiscoveryConstant.N_D_ADDRESS);
        if (StringUtils.isNotEmpty(routeAddress)) {
            System.out.println(DiscoveryConstant.N_D_ADDRESS + "=" + routeAddress);
        }
        String routeEnvironment = strategyContextHolder.getHeader(DiscoveryConstant.N_D_ENVIRONMENT);
        if (StringUtils.isNotEmpty(routeEnvironment)) {
            System.out.println(DiscoveryConstant.N_D_ENVIRONMENT + "=" + routeEnvironment);
        }
        String routeVersionWeight = strategyContextHolder.getHeader(DiscoveryConstant.N_D_VERSION_WEIGHT);
        if (StringUtils.isNotEmpty(routeVersionWeight)) {
            System.out.println(DiscoveryConstant.N_D_VERSION_WEIGHT + "=" + routeVersionWeight);
        }
        String routeRegionWeight = strategyContextHolder.getHeader(DiscoveryConstant.N_D_REGION_WEIGHT);
        if (StringUtils.isNotEmpty(routeRegionWeight)) {
            System.out.println(DiscoveryConstant.N_D_REGION_WEIGHT + "=" + routeRegionWeight);
        }

        Map<String, String> customizationMap = getCustomizationMap();
        if (MapUtils.isNotEmpty(customizationMap)) {
            for (Map.Entry<String, String> entry : customizationMap.entrySet()) {
                System.out.println(entry.getKey() + "=" + entry.getValue());
            }
        }
        System.out.println("--------------------------------------------------");
    }