Spring Boot provides ErrorAttributes interface which helps to extract the low level Servlet error attributes. We can inject ErrorAttributes as a bean in our custom ErrorController (last example). Spring boot provides only one implementation DefaultErrorAttributes, which provides various attributes as stated here.
Example
Our Custom ErrorController
@Controller
public class MyCustomErrorController implements ErrorController {
@Autowired
private ErrorAttributes errorAttributes;
@RequestMapping("/error")
@ResponseBody
public String handleError(HttpServletRequest request) {
ServletWebRequest servletWebRequest = new ServletWebRequest(request);
Map<String, Object> errorAttributes = this.errorAttributes.getErrorAttributes(servletWebRequest, true);
final StringBuilder errorDetails = new StringBuilder();
errorAttributes.forEach((attribute, value) -> {
errorDetails.append("<tr><td>")
.append(attribute)
.append("</td><td><pre>")
.append(value)
.append("</pre></td></tr>");
});
return String.format("<html><head><style>td{vertical-align:top;border:solid 1px #666;}</style>"
+ "</head><body><h2>Error Page</h2><table>%s</table></body></html>", errorDetails.toString());
}
@Override
public String getErrorPath() {
return "/error";
}
}
An application Controller
@Controller
public class MyAppController {
@RequestMapping("/")
public void handleRequest() {
throw new RuntimeException("test exception");
}
}
Boot main class
@SpringBootApplication
public class SpringBootMain{
public static void main(String[] args) {
SpringApplication.run(SpringBootMain.class);
}
}
Output
Example Project
Dependencies and Technologies Used:
Spring Boot 2.0.0.RELEASE Corresponding Spring Version 5.0.4.RELEASE
spring-boot-starter-web : Starter for building web, including RESTful, applications using Spring
MVC. Uses Tomcat as the default embedded container.
