At work we have a component not yet migrated to Python 3, and we recently had some difficulties diagnosing a problem with the MySQL connector.

Because we were catching the mysql.connector.errors.Error and raising a custom exception, we were loosing the underlying stacktrace and hence couldn't troubleshoot the …

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Since Spring 4.1, it is really easy to enable JSONP on an API controller:

@RestController
@RequestMapping(value = "/")
public class MyController {

    @ControllerAdvice
    static class JsonpAdvice extends AbstractJsonpResponseBodyAdvice {
        public JsonpAdvice() {
            super("callback"); // name of the query parameter to use
        }
    }

    @RequestMapping(value = "/", method = RequestMethod.GET)
    public MyAPIResult getStuff(...) {
        ...
    }
}

There is no RFC …

Simply add the following class to your project. It will be automatically registered at start-up if you use the @EnableAutoConfiguration annotation :

@ControllerAdvice  // Makes this the default behaviour of all controllers
@ConditionalOnProperty(prefix = "app", name = "disable-default-exception-handling")
class GlobalControllerExceptionHandler {
    @ExceptionHandler(Exception.class)  // Catch any exception
    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)  // Returns an error code …

I've lost quite some time on this error recently :

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.class]: Invocation of init method failed; nested exception is java.lang.AbstractMethodError: org.hibernate.jpa.boot …

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