[Spring] Spring REST Exception Handling

Problem!

REST CRUD APIs(6)

• if wrong student id like out of number

You can handle the exception and return as JOSN

Spring REST Exception Handling

Development Process

1. Create a custom error response class
2. Create a custom exception class
3. Update REST service to throw exception if student not found
4. Add an exception handler method using @ExceptionHandler

Step 1: Create custom error response class

• The custom error response class will be sent back to client as JSON
• We will define as Java class(POJO)
  • 
  • You can define any custom fields that you want to track
• Jackson will handle converting it to JSON
• 

Step 2: Create custom student exception

• The custom student exception will used by our REST service
• In our code, if we can’t find student, then we’ll throw an exception
• Need to define a custom student exception class

Step 3: Update REST service to throw exception

Spring REST Exception Handling

Step 4: Add exception handler method

• Define exception handler method(s) with **@ExceptionHandler **annotation
• Exception handler will return a ResponseEntity
• ResponseEntity is a wrapper for the HTTP response object
• ResponseEntity provides fine-grained control to specify:
  • HTTP status code, HTTP headers and Response body

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