output: #fixed code
                                  @Override
      public RelationalReader getIterableReader(ClassInfo classInfo, Class<?> parameterType, String relationshipType, String relationshipDirection) {
          if(!iterableReaderCache.containsKey(classInfo)) {
              iterableReaderCache.put(classInfo, new HashMap<DirectedRelationshipForType, RelationalReader>());
          }
          DirectedRelationshipForType directedRelationshipForType = new DirectedRelationshipForType(relationshipType,relationshipDirection, parameterType);
          if(iterableReaderCache.get(classInfo).containsKey(directedRelationshipForType)) {
              return iterableReaderCache.get(classInfo).get(directedRelationshipForType);
          }
  
          //1st find a method annotated with type and direction
          MethodInfo methodInfo = getIterableGetterMethodInfo(classInfo, parameterType, relationshipType, relationshipDirection, STRICT_MODE);
          if (methodInfo != null) {
              MethodReader methodReader =  new MethodReader(classInfo, methodInfo);
              iterableReaderCache.get(classInfo).put(directedRelationshipForType, methodReader);
              return methodReader;
          }
  
          //2nd find a field annotated with type and direction
          FieldInfo fieldInfo = getIterableFieldInfo(classInfo, parameterType, relationshipType, relationshipDirection, STRICT_MODE);
          if (fieldInfo != null) {
              FieldReader fieldReader = new FieldReader(classInfo, fieldInfo);
              iterableReaderCache.get(classInfo).put(directedRelationshipForType, fieldReader);
              return fieldReader;
          }
  
          //If relationshipDirection=INCOMING, we should have found an annotated field already
  
          if(!relationshipDirection.equals(Relationship.INCOMING)) {
              //3rd find a method with implied type and direction
              methodInfo = getIterableGetterMethodInfo(classInfo, parameterType, relationshipType, relationshipDirection, INFERRED_MODE);
              if (methodInfo != null) {
                  MethodReader methodReader = new MethodReader(classInfo, methodInfo);
                  iterableReaderCache.get(classInfo).put(directedRelationshipForType, methodReader);
                  return methodReader;
              }
  
              //4th find a field with implied type and direction
              fieldInfo = getIterableFieldInfo(classInfo, parameterType, relationshipType, relationshipDirection, INFERRED_MODE);
              if (fieldInfo != null) {
                  FieldReader fieldReader = new FieldReader(classInfo, fieldInfo);
                  iterableReaderCache.get(classInfo).put(directedRelationshipForType, fieldReader);
                  return fieldReader;
              }
          }
          iterableReaderCache.get(classInfo).put(directedRelationshipForType, null);
          return null;
      }
input: #vulnerable code 
                                  @Override
      public RelationalReader getIterableReader(ClassInfo classInfo, Class<?> parameterType, String relationshipType, String relationshipDirection) {
          if(iterableReaderCache.get(classInfo) == null) {
              iterableReaderCache.put(classInfo, new HashMap<DirectedRelationshipForType, RelationalReader>());
          }
          DirectedRelationshipForType directedRelationshipForType = new DirectedRelationshipForType(relationshipType,relationshipDirection, parameterType);
          if(iterableReaderCache.get(classInfo).containsKey(directedRelationshipForType)) {
              return iterableReaderCache.get(classInfo).get(directedRelationshipForType);
          }
  
          //1st find a method annotated with type and direction
          MethodInfo methodInfo = getIterableGetterMethodInfo(classInfo, parameterType, relationshipType, relationshipDirection, STRICT_MODE);
          if (methodInfo != null) {
              MethodReader methodReader =  new MethodReader(classInfo, methodInfo);
              iterableReaderCache.get(classInfo).put(directedRelationshipForType, methodReader);
              return methodReader;
          }
  
          //2nd find a field annotated with type and direction
          FieldInfo fieldInfo = getIterableFieldInfo(classInfo, parameterType, relationshipType, relationshipDirection, STRICT_MODE);
          if (fieldInfo != null) {
              FieldReader fieldReader = new FieldReader(classInfo, fieldInfo);
              iterableReaderCache.get(classInfo).put(directedRelationshipForType, fieldReader);
              return fieldReader;
          }
  
          //If relationshipDirection=INCOMING, we should have found an annotated field already
  
          if(!relationshipDirection.equals(Relationship.INCOMING)) {
              //3rd find a method with implied type and direction
              methodInfo = getIterableGetterMethodInfo(classInfo, parameterType, relationshipType, relationshipDirection, INFERRED_MODE);
              if (methodInfo != null) {
                  MethodReader methodReader = new MethodReader(classInfo, methodInfo);
                  iterableReaderCache.get(classInfo).put(directedRelationshipForType, methodReader);
                  return methodReader;
              }
  
              //4th find a field with implied type and direction
              fieldInfo = getIterableFieldInfo(classInfo, parameterType, relationshipType, relationshipDirection, INFERRED_MODE);
              if (fieldInfo != null) {
                  FieldReader fieldReader = new FieldReader(classInfo, fieldInfo);
                  iterableReaderCache.get(classInfo).put(directedRelationshipForType, fieldReader);
                  return fieldReader;
              }
          }
          iterableReaderCache.get(classInfo).put(directedRelationshipForType, null);
          return null;
      } 
                              #location 7 
                              #vulnerability type NULL_DEREFERENCE