Java: Global Exception Handler

Java: Global Exception Handler

Use Thread.setDefaultUncaughtExceptionHandler. See Rod Hilton's "Global Exception Handling" blog post for an example.

How to handle global exceptions in java spring?

Make it a component and set the derault exception handler in an @PostContruct method.

@Component
public class GlobalExceptionHandler implements Thread.UncaughtExceptionHandler{

    @Autowired
    private LoggedExceptionService service;

    public GlobalExceptionHandler() {
    }

    @PostContruct
    public void init(){
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    @Override
    public void uncaughtException(Thread t, Throwable e) {
        System.err.println("IN UNCAUGHTEXCEPTION METHOD");
        this.service.saveException(new LoggedException(e));
    }
}

This allows you to automatically set the handler as methods annotated with @PostContruct in components are automatically executed on startup.

Making GlobalExceptionHandler a spring component also allows to autowire service that would never been set otherwise. Anyways, I would recommend you to usd constructor autowiring:

@Component
public class GlobalExceptionHandler implements Thread.UncaughtExceptionHandler{

    private final LoggedExceptionService service;

    @Autowired // @Autowired is actually not necessary if this is the only constructor
    public GlobalExceptionHandler(LoggedExceptionService service) {
        this.service=service
    }

    @PostContruct
    public void init(){
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    @Override
    public void uncaughtException(Thread t, Throwable e) {
        System.err.println("IN UNCAUGHTEXCEPTION METHOD");
        this.service.saveException(new LoggedException(e));
    }
}

Customize Global Exception Handler in java Spring Boot

You would need to extend ResponseEntityExceptionHandler as follows:

@ControllerAdvice("uz.pdp.warehouse")
public class GlobalExceptionHandler extends ResponseEntityExceptionHandler  {

    @ExceptionHandler({RuntimeException.class})
    public ResponseEntity<DataDto<AppError>> handle500(RuntimeException e, WebRequest webRequest) {
        return new ResponseEntity<>(
                new DataDto<>(AppErrorDto.builder()
                        .message(e.getMessage())
                        .status(HttpStatus.INTERNAL_SERVER_ERROR)
                        .path(webRequest.getContextPath())
                        .build()));
    }

}

Global error handling for spring standalone application

Spring does not support global exception handler for standalone / non-mvc. As explained here you may need to implement it by defining jointpoint and pointcuts and enable pointcut for any "*Exception".

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