message without arguments in log

[dutrieux]

Hello,

If I log the error in log4j2, the message is display without arguments :

in json it's ok :

Best regards

Duto

[officiallysingh]

thanks @dutrieux , Ill look into it, can yoiu suggest me the steps to reproduce

[dutrieux]

thanks @dutrieux , Ill look into it, can yoiu suggest me the steps to reproduce

juste log (with log4j) all error to console

[dutrieux]

do you have any etat of this problem.

Best regards

[officiallysingh]

do you have any etat of this problem.

Best regards

Can you provide me a sample spring boot project (git hub link) where you are facing the issue. So that I can reproduce and fix the same.

[oiltea]

I understand his meaning, which is that the error message with placeholders printed in the console or log did not replace the placeholders as expected.

Sample code

@Getter
public enum AppErrors implements ErrorType {
  USER_EXISTS("user.exists", "User `{0}` already exists", HttpStatus.SERVICE_UNAVAILABLE);
  // All other error scenarios could be added here

  private final String errorKey;
  private final String defaultDetail;
  private final HttpStatus status;

  AppErrors(final String errorKey, final String defaultDetail, final HttpStatus status) {
    this.errorKey = errorKey;
    this.defaultDetail = defaultDetail;
    this.status = status;
  }
}

@PostMapping("/users")
public void create(@RequestBody User user) {
  throw Problems.newInstance(AppErrors.USER_EXISTS).detailArgs("admin").throwAble();
}

Console or log expected information

2026-01-20T15:28:38.057+08:00 ERROR 40808 --- [demo] [nio-8080-exec-2] c.k.problem.spring.advice.AdviceTrait    : Service Unavailable

com.ksoot.problem.core.ApplicationProblem: user.exists, User `admin` already exists

Console or log actual information

2026-01-20T15:28:38.057+08:00 ERROR 40808 --- [demo] [nio-8080-exec-2] c.k.problem.spring.advice.AdviceTrait    : Service Unavailable

com.ksoot.problem.core.ApplicationProblem: user.exists, User `{0}` already exists

I have fixed this issue and submitted a merge request #12

[dutrieux]

Very thanks for this fix. It's possible to have this fix for version Spring Boot 3.x. ?

Best regards

[oiltea]

Very thanks for this fix. It's possible to have this fix for version Spring Boot 3.x. ?

Best regards

Yes, also applicable to Spring Boot 3.x version