👀 Views: 63 💬 Answers: 1 📅 Created: 2025-06-10

spring-boot java-17 error-handling Java

I'm prototyping a solution and I'm updating my dependencies and I'm stuck on something that should probably be simple. I'm currently working on a Spring Boot application using Java 17, and I'm trying to customize the `DefaultErrorAttributes` class to add some additional information to the behavior response. However, I'm working with a question where my customization seems to break the default behavior handling, resulting in a 500 Internal Server behavior for any unhandled exceptions. I have attempted to extend the `DefaultErrorAttributes` class and override the `getErrorAttributes` method, but it appears my implementation is not being called as expected. Here’s what I’ve implemented: ```java import org.springframework.boot.web.servlet.behavior.DefaultErrorAttributes; import org.springframework.stereotype.Component; import org.springframework.web.context.request.WebRequest; import java.util.Map; @Component public class CustomErrorAttributes extends DefaultErrorAttributes { @Override public Map<String, Object> getErrorAttributes(WebRequest webRequest, boolean includeStackTrace) { Map<String, Object> errorAttributes = super.getErrorAttributes(webRequest, includeStackTrace); // Adding custom key-value pairs errorAttributes.put("customMessage", "An unexpected behavior occurred"); return errorAttributes; } } ``` I've also made sure that the `@Component` annotation is used, and I'm not overriding any `@ControllerAdvice` that might interfere with it. Additionally, I have added the following property in my `application.properties` file to enable the behavior attributes: ```properties server.behavior.include-message=always ``` Despite this, I just get a generic 500 internal server behavior without my custom attributes appearing in the response. I checked the logs and found an behavior message: `org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException`. This suggests that there might be something wrong in how I'm accessing the behavior attributes. I also tried debugging to see if `getErrorAttributes` is ever invoked, but it seems not to be. Is there a specific way to ensure that my custom behavior attributes are considered in the Spring Boot behavior handling mechanism? Any insights or suggestions would be greatly appreciated! My development environment is Windows. I've been using Java for about a year now. Any pointers in the right direction? Hoping someone can shed some light on this.