Is this possible to print the cause of exception? about rest.vertx HOT 5 CLOSED

An error should be logged by the ClassFactory that creates the class, ie. you should see a log entry.
See: https://github.com/zandero/rest.vertx#logging.
Alternatively use debugger and place your breakpoint inside the ClassFactory.newInstanceOf method, to see what is missing.

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@drejc
I have checked that, even if the log level is debug, the detail cannot be shown. It is very important for us, because once the exception occurs and cannot register api, we could not find the root cause without the detail information for incorrect configurations in production env, not just debug or development.

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If you take a deeper look at the api = ClassFactory.newInstanceOf you will see that the exception is logged and then returned so you should get some additional data.
The exception happens somewhere inside you injection provider implementation on this call: instance = provider.getInstance(clazz);

As you are the one who implements this part I suggest you put a try/catch inside your injection provider:

 @Override
    public <T> T getInstance(Class<T> clazz) {
        try {
return injector.getInstance(clazz);
}
catch (Exception ex) {
  // LOG away
}
    }

Other than that you can always provide a custom patch if you want additional functionality to be included.

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This method you mentioned is not concise，I just want to be like springboot by using @Autowired

This is sample code:

@path("/api/")
public class TestApi {

@Inject
private TestService service

@get
@path("/{tenant}/{offering}")
@produces(MediaType.APPLICATION_JSON)
public void apitest() {}
}
}

If like the code, we cannot get real exception information or log if there are some injection errors.
You could try it, I just want to make the root cause more clear, it's just one line code work for you.

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I honestly don't know what you are talking about. Please provide either a patch or test to demonstrate what you would like to achieve.

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