#vulnerable code 
                                @RequestMapping(value = "/api/processor", method = RequestMethod.POST, headers = "Accept=application/json")
    ConversationDTO requestProcessor(@RequestParam(value = "runnerLogId", required = false) String runnerLogId, @RequestBody RfRequestDTO rfRequestDTO) {
	Conversation existingConversation = null;
	Conversation currentConversation;

	// TODO : Get RfRequest Id if present as part of this request and update the existing conversation entity.
	// Note : New conversation entity which is getting created below is still required for logging purpose.
	
	if (rfRequestDTO == null) {
	    return null;
	} else if (rfRequestDTO.getId() != null && !rfRequestDTO.getId().isEmpty()) {
	    RfRequest rfRequest = rfRequestRepository.findOne(rfRequestDTO.getId());
	    String conversationId = rfRequest != null ? rfRequest.getConversationId() : null;
	    existingConversation = conversationId != null ? conversationRepository.findOne(conversationId) : null;
	    // finding updated existing conversation
	    existingConversation = existingConversation != null ? nodeRepository.findOne(existingConversation.getNodeId()).getConversation() : null;
	    rfRequestDTO.setAssertionDTO(EntityToDTO.toDTO(existingConversation.getRfRequest().getAssertion()));
	}

	long startTime = System.currentTimeMillis();
	RfResponseDTO result = genericHandler.processHttpRequest(rfRequestDTO);
	long endTime = System.currentTimeMillis();
	long duration = endTime - startTime;

	if (result != null) {
	    String nodeId = null;
	    if (existingConversation != null && existingConversation.getNodeId() != null) {
		nodeId = existingConversation.getNodeId();
	    }
	    assertHandler.runAssert(result, nodeId);
	}

	currentConversation = ConversationConverter.convertToEntity(rfRequestDTO, result);

	// This is used to get project-runner/folder-runner logs
	currentConversation.setRunnerLogId(runnerLogId);

	if (existingConversation != null) {
	    currentConversation.getRfRequest().setAssertion(existingConversation.getRfRequest().getAssertion());
	}

	rfRequestRepository.save(currentConversation.getRfRequest());
	rfResponseRepository.save(currentConversation.getRfResponse());

	currentConversation.setDuration(duration);

	Object principal = SecurityContextHolder.getContext().getAuthentication().getPrincipal();
	if (principal instanceof User) {
	    currentConversation.setLastModifiedBy((User) principal);
	}

	Date currentDate = new Date();
	currentConversation.setCreatedDate(currentDate);
	currentConversation.setLastModifiedDate(currentDate);
	currentConversation.setLastRunDate(currentDate);
	
	currentConversation.setName(currentConversation.getRfRequest().getApiUrl());
	try {
	    currentConversation = conversationRepository.save(currentConversation);

	    currentConversation.getRfRequest().setConversationId(currentConversation.getId());
	    rfRequestRepository.save(currentConversation.getRfRequest());
	    
	    ActivityLog activityLog = null;

	    // Note : existingConversation will be null if the request was not saved previously.
	    if (existingConversation != null && existingConversation.getNodeId() != null) {
		BaseNode node = nodeRepository.findOne(existingConversation.getNodeId());
		currentConversation.setNodeId(node.getId());
		currentConversation.setName(node.getName());
		
		activityLog = activityLogRepository.findActivityLogByDataId(node.getId());
	    }
	    
	    if (principal instanceof User) {
		currentConversation.setLastModifiedBy((User) principal);
	    }

	    conversationRepository.save(currentConversation);
	    
	    if (activityLog == null) {
	    activityLog = new ActivityLog();
	    	activityLog.setDataId(existingConversation.getNodeId());
	    	activityLog.setType("CONVERSATION");
	    }
	    
	    activityLog.setName(currentConversation.getName());
	    activityLog.setWorkspaceId(currentConversation.getWorkspaceId());
	    activityLog.setLastModifiedDate(currentDate);
	    
	    List<BaseEntity> logData = activityLog.getData();
	    logData.add(0, currentConversation);
	    
	    activityLogRepository.save(activityLog);

	} catch (InvalidDataAccessResourceUsageException e) {
	    throw new ApiException("Please use sql as datasource, some of features are not supported by hsql", e);
	}
	ConversationDTO conversationDTO = new ConversationDTO();
	conversationDTO.setWorkspaceId(rfRequestDTO.getWorkspaceId());
	conversationDTO.setDuration(duration);
	conversationDTO.setRfResponseDTO(result);
	if (result != null) {
	    result.setItemDTO(conversationDTO);
	}
	return conversationDTO;
    } 
                            #location 83 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @RequestMapping(value = "/api/processor", method = RequestMethod.POST, headers = "Accept=application/json")
    ConversationDTO requestProcessor(@RequestParam(value = "runnerLogId", required = false) String runnerLogId, @RequestBody RfRequestDTO rfRequestDTO) {
	Conversation existingConversation = null;
	Conversation currentConversation;

	// TODO : Get RfRequest Id if present as part of this request and update the existing conversation entity.
	// Note : New conversation entity which is getting created below is still required for logging purpose.
	
	if (rfRequestDTO == null) {
	    return null;
	} else if (rfRequestDTO.getId() != null && !rfRequestDTO.getId().isEmpty()) {
	    RfRequest rfRequest = rfRequestRepository.findOne(rfRequestDTO.getId());
	    String conversationId = rfRequest != null ? rfRequest.getConversationId() : null;
	    existingConversation = conversationId != null ? conversationRepository.findOne(conversationId) : null;
	    // finding updated existing conversation
	    existingConversation = existingConversation != null ? nodeRepository.findOne(existingConversation.getNodeId()).getConversation() : null;
	    if(existingConversation != null) {
	       rfRequestDTO.setAssertionDTO(EntityToDTO.toDTO(existingConversation.getRfRequest().getAssertion()));
	    }
	}
	
	long startTime = System.currentTimeMillis();
	RfResponseDTO result = genericHandler.processHttpRequest(rfRequestDTO);
	long endTime = System.currentTimeMillis();
	long duration = endTime - startTime;

	if (result != null) {
	    String nodeId = null;
	    if (existingConversation != null && existingConversation.getNodeId() != null) {
		nodeId = existingConversation.getNodeId();
	    }
	    assertHandler.runAssert(result, nodeId);
	}

	currentConversation = ConversationConverter.convertToEntity(rfRequestDTO, result);

	// This is used to get project-runner/folder-runner logs
	currentConversation.setRunnerLogId(runnerLogId);

	if (existingConversation != null) {
	    currentConversation.getRfRequest().setAssertion(existingConversation.getRfRequest().getAssertion());
	}

	rfRequestRepository.save(currentConversation.getRfRequest());
	rfResponseRepository.save(currentConversation.getRfResponse());

	currentConversation.setDuration(duration);

	Object principal = SecurityContextHolder.getContext().getAuthentication().getPrincipal();
	if (principal instanceof User) {
	    currentConversation.setLastModifiedBy((User) principal);
	}

	Date currentDate = new Date();
	currentConversation.setCreatedDate(currentDate);
	currentConversation.setLastModifiedDate(currentDate);
	currentConversation.setLastRunDate(currentDate);
	
	currentConversation.setName(currentConversation.getRfRequest().getApiUrl());
	try {
	    currentConversation = conversationRepository.save(currentConversation);

	    currentConversation.getRfRequest().setConversationId(currentConversation.getId());
	    rfRequestRepository.save(currentConversation.getRfRequest());
	    
	    ActivityLog activityLog = null;

	    // Note : existingConversation will be null if the request was not saved previously.
	    if (existingConversation != null && existingConversation.getNodeId() != null) {
		BaseNode node = nodeRepository.findOne(existingConversation.getNodeId());
		currentConversation.setNodeId(node.getId());
		currentConversation.setName(node.getName());
		
		activityLog = activityLogRepository.findActivityLogByDataId(node.getId());
	    }
	    
	    if (principal instanceof User) {
		currentConversation.setLastModifiedBy((User) principal);
	    }

	    conversationRepository.save(currentConversation);
	    
	    if (activityLog == null) {
	        activityLog = new ActivityLog();
	        if(existingConversation != null) {
	           activityLog.setDataId(existingConversation.getNodeId());
	        }
	        activityLog.setType("CONVERSATION");
	    }
	    
	    activityLog.setName(currentConversation.getName());
	    activityLog.setWorkspaceId(currentConversation.getWorkspaceId());
	    activityLog.setLastModifiedDate(currentDate);
	    
	    List<BaseEntity> logData = activityLog.getData();
	    logData.add(0, currentConversation);
	    
	    activityLogRepository.save(activityLog);

	} catch (InvalidDataAccessResourceUsageException e) {
	    throw new ApiException("Please use sql as datasource, some of features are not supported by hsql", e);
	}
	ConversationDTO conversationDTO = new ConversationDTO();
	conversationDTO.setWorkspaceId(rfRequestDTO.getWorkspaceId());
	conversationDTO.setDuration(duration);
	conversationDTO.setRfResponseDTO(result);
	if (result != null) {
	    result.setItemDTO(conversationDTO);
	}
	return conversationDTO;
    }