ExceptionHandling Library Using SpringBoot - spring-boot

Question

I am using SpringBoot for creating Services. Now for Exception Handling (Using #COntrollerAdvice), I am trying to create a library instead of creating same files in each Service. This is my Exception Handler
#ControllerAdvice
public class CustomExceptionHandler {
private static final Logger logger = LoggerFactory.getLogger(CustomExceptionHandler.class);
/*
* This handles constraint voilation exception.
* #param exception
*/
#ExceptionHandler(ConstraintViolationException.class)
#ResponseBody
public ResponseEntity<?> handleConstraintVoilationException(ConstraintViolationException exception){
logger.info("Inside SumsExceptionHandler.handleConstraintVoilationException()");
ValidationErrorResponse validationResponse = null;
for(ConstraintViolation<?> constraintViolation : exception.getConstraintViolations()) {
validationResponse = this.makeValidationResponse(constraintViolation);
}
return new ResponseEntity<>(validationResponse, HttpStatus.BAD_REQUEST);
}
/*
* This handles MethodArgument Type Mismatch Exception.
* #param ex
*/
#ExceptionHandler(MethodArgumentTypeMismatchException.class)
#ResponseBody
public ResponseEntity<?> handleMethodArgumentTypeMismatchException(MethodArgumentTypeMismatchException exception){
logger.info("Inside SumsExceptionHandler.handleMethodArgumentTypeMismatchException()");
ValidationErrorResponse validationResponse = new ValidationErrorResponse();
validationResponse.setField(exception.getName());
validationResponse.setCode(exception.getRequiredType().getSimpleName());
validationResponse.setMessage(exception.getValue()+" must have valid input of type "+exception.getRequiredType().getSimpleName());
return new ResponseEntity<>(validationResponse, HttpStatus.BAD_REQUEST);
}
/*
* This handles Missing Servlet Request Parameter Exception.
* #param ex
*/
#ExceptionHandler(MissingServletRequestParameterException.class)
#ResponseBody
public ResponseEntity<?> handleMissingServletRequestParameterException(MissingServletRequestParameterException exception){
logger.info("Inside SumsExceptionHandler.handleMissingServletRequestParameterException()");
ValidationErrorResponse validationResponse = new ValidationErrorResponse();
validationResponse.setField(exception.getParameterName());
validationResponse.setCode(exception.getParameterType());
validationResponse.setMessage(exception.getMessage());
return new ResponseEntity<>(validationResponse, HttpStatus.BAD_REQUEST);
}
private ValidationErrorResponse makeValidationResponse(ConstraintViolation<?> constraintViolation) {
String fieldStr = constraintViolation.getPropertyPath().toString();
String field = null;
if(fieldStr != null) {
String[] fieldArr = fieldStr.split("\\.");
field = fieldArr[fieldArr.length-1];
}
return new ValidationErrorResponse(field,
constraintViolation.getMessageTemplate(),
constraintViolation.getMessage());
}
}
a) How do I create it a stand-alone library?(This is also a springboot Project)
b) How to then use it in other Projects?

Answer 1

a) How do I create it a stand-alone library?(This is also a springboot Project)
Create separate project with minimum dependencies.
b) How to then use it in other Projects?
Build that project, Use that project as a library by adding jar in classpath
According to the documentation:
Spring Boot makes it easy to create stand-alone, production-grade
Spring based Applications that you can "just run".

Answer 2

You can also use maven to generate a new package with the required dependencies, then you can add the dependency in pom.xml. Gets a lookup on creating dependencies with Maven.

Answer 3

create a new Maven Java Project with version and artifact Id ...
will package it as a jar
add your needed dependencies related to all common facilities will
provide
add your facilities implementation >>>Ex #ControllerAdvice ...
in your main project will include it as a dependency