Debugging Errors Reported by Sentry

Prompt Template

"I'm encountering a [Error Type, e.g., NullPointerException] in [Function or Method Name] at [File Name] line [Line Number]: [Brief Description of the Error, e.g., 'variableName' is null]. How can I fix this error and ensure that [Explanation of what needs to be validated or handled]?"

Sample Sentry Issue

Issue Title: NullReferenceException in OrderProcessor.ProcessOrder

Event ID: 123e4567-e89b-12d3-a456-426614174000

Timestamp: 2023-10-01T14:22:30Z

Project: ECommercePlatform

Environment: Production

Error Details:

Error Message: NullReferenceException: Object reference not set to an instance of an object.
Stack Trace:

NullReferenceException: Object reference not set to an instance of an object.
  at OrderProcessor.ProcessOrder(Order order) in OrderProcessor.cs:line 42
  at OrderController.SubmitOrder(Order order) in OrderController.cs:line 27
  ...

Culprit: OrderProcessor.cs line 42

Additional Data:

User: user@example.com
HTTP Method: POST
URL: /api/orders/submit

Project Files

Project Structure:

ECommercePlatform/
├── Controllers/
│   └── OrderController.cs
├── Services/
│   └── OrderProcessor.cs
├── Models/
│   └── Order.cs
└── Program.cs

Workflow to Resolve the Sentry Issue Using Fynix

Step 1: Identify the Error from Sentry

Error: NullReferenceException: Object reference not set to an instance of an object.
Location: OrderProcessor.cs line 42
Stack Trace: Points to OrderProcessor.ProcessOrder(Order order)

Step 2: Open the Project in the IDE

Open ECommercePlatform in your IDE (e.g., Visual Studio, VS Code) with the Fynix plugin installed and activated.

Step 3: Navigate to the Problematic Code

Prompt to Fynix:

"I'm getting a NullReferenceException at @OrderProcessor.cs line 42: order.Customer is null. How can I prevent this error and handle the case when Customer is null?"

Fynix Response:

"The error occurs because order.Customer is null. To prevent the NullReferenceException, you should check if order.Customer is not null before accessing its properties. Here's how you can modify your code:"

Suggested Code Modification:

public void ProcessOrder(Order order)
{
    // Some processing logic
double discount = 0;

    if (order.Customer != null)
    {
        discount = order.Customer.DiscountRate;
    }
    else
    {
        // Handle the case where Customer is null
// For example, assign a default discount rate or throw an exception
        discount = 0; // Or log a warning
    }

    // Apply discount and process order
}

Step 5: Apply the Fix

Update OrderProcessor.cs with the suggested code. You can use “insert at selection” to replace the code block.

Updated OrderProcessor.cs:

public void ProcessOrder(Order order)
{
    // Some processing logic
double discount = 0;

    if (order.Customer != null)
    {
        discount = order.Customer.DiscountRate;
    }
    else
    {
        // Assign default discount rate or handle accordingly
        discount = 0;
    }

    // Continue processing the order with the discount
}

Step 6: Test the Application

Build and run the application.
Use a tool like Postman or curl to send a POST request to /api/orders/submit with and without the Customer property in the Order object.

Sample Request Without Customer:

{
"Id": 1
// No "Customer" property
}

Sample Request With Customer:

{
"Id": 1,
"Customer": {
"Id": 100,
"DiscountRate": 0.1
}
}

Verify that the application handles both cases without throwing an exception.

Step 7: Verify the Fix

Confirm that the error no longer occurs when Customer is null.
Monitor Sentry to ensure no new events are reported for this issue.

Step 8: Close the Issue in Sentry

In Sentry, mark the issue as resolved.
Document the fix and reference the code changes or commits.

Python Example

Sample Sentry Issue

Issue Title: AttributeError in process_order

Event ID: abc12345-def6-7890-ghij-klmnopqrstuv

Timestamp: 2023-10-01T14:22:30Z

Project: ECommercePlatform

Environment: Production

Error Details:

Error Message: AttributeError: 'NoneType' object has no attribute 'customer_id'
Stack Trace:

AttributeError: 'NoneType' object has no attribute 'customer_id'
File "order_processor.py", line 42, in process_order
    discount = order.customer.customer_discount
  File "order_controller.py", line 27, in submit_order
    processor.process_order(order)

Culprit: order_processor.py line 42

Additional Data:

User: user@example.com
HTTP Method: POST
URL: /api/orders/submit

Project Files

Project Structure:

ECommercePlatform/
├── controllers/
│   └── order_controller.py
├── services/
│   └── order_processor.py
├── models/
│   └── order.py
└── app.py

Workflow to Resolve the Sentry Issue Using Fynix

Step 1: Identify the Error from Sentry

Error: AttributeError: 'NoneType' object has no attribute 'customer_id'
Location: order_processor.py line 42
Stack Trace: Points to process_order method in order_processor.py

Step 2: Open the Project in the IDE

Open ECommercePlatform in your IDE (e.g., PyCharm, VS Code) with the Fynix plugin installed and activated.

Step 3: Navigate to the Problematic Code

Go to order_processor.py and navigate to line 42.

Original order_processor.py:

# services/order_processor.py

class OrderProcessor:
    def process_order(self, order):
        # Some processing logic
        discount = order.customer.customer_discount
        # Apply discount and process order

Step 4: Use Fynix to Debug the Issue

Prompt to Fynix:

"Fynix, I'm getting an AttributeError at order_processor.py line 42: order.customer is None. How can I prevent this error and handle the case when customer is None?"

Fynix Response:

"The error occurs because order.customer is None. To prevent the AttributeError, you should check if order.customer is not None before accessing its attributes. Here's how you can modify your code:"

Suggested Code Modification:

# services/order_processor.py

class OrderProcessor:
    def process_order(self, order):
        # Some processing logic
        discount = 0

        if order.customer is not None:
            discount = order.customer.customer_discount
        else:
            # Handle the case where customer is None
            discount = 0  # Assign default discount or log a warning

        # Apply discount and process order

Step 5: Apply the Fix

Update order_processor.py with the suggested code.

Updated order_processor.py:

# services/order_processor.py

class OrderProcessor:
    def process_order(self, order):
        # Some processing logic
        discount = 0

        if order.customer is not None:
            discount = order.customer.customer_discount
        else:
            # Assign default discount or handle accordingly
            discount = 0

        # Continue processing the order with the discount

Step 6: Test the Application

Run the Application:

python app.py

Simulate Order Submission Without Customer:

Send a POST request to /api/orders/submit without the customer field.

Sample Request Without Customer:

{
  "order_id": 1
  // No "customer" field
}

Simulate Order Submission With Customer:

Send a POST request with the customer field included.

Sample Request With Customer:

{
  "order_id": 1,
  "customer": {
    "customer_id": 100,
    "customer_discount": 0.1
  }
}

Verify:
- Ensure that the application handles both cases without throwing an exception.
- Check that the discount is applied correctly when the customer exists.

Step 7: Verify the Fix

Confirm that the AttributeError no longer occurs when order.customer is None.
Monitor Sentry to ensure no new events are reported for this issue.

Step 8: Close the Issue in Sentry

In Sentry, mark the issue as resolved.
Document the fix and reference the code changes or commits.

Similarly the user can Resolve Sentry issues respective to their tech stack, for example, Java or Node.

Prompt Template​

Sample Sentry Issue​

Project Files​

Workflow to Resolve the Sentry Issue Using Fynix​

Prompt to Fynix:​

Fynix Response:​

Python Example​

Project Files​

Workflow to Resolve the Sentry Issue Using Fynix​

Prompt to Fynix:​

Fynix Response:​

Prompt Template

Sample Sentry Issue

Project Files

Workflow to Resolve the Sentry Issue Using Fynix

Prompt to Fynix:

Fynix Response:

Python Example

Project Files

Workflow to Resolve the Sentry Issue Using Fynix

Prompt to Fynix:

Fynix Response: