Added example for spring boot exception handling

spring-boot-rest/src/main/java/com/baeldung/errorhandling/boot/ErrorHandlingBootApplication.java

@@ -0,0 +1,15 @@
+package com.baeldung.errorhandling.boot;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.PropertySource;
+
+@SpringBootApplication
+@PropertySource("errorhandling-application.properties")
+public class ErrorHandlingBootApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(ErrorHandlingBootApplication.class, args);
+    }
+
+}

spring-boot-rest/src/main/java/com/baeldung/errorhandling/boot/configurations/MyCustomErrorAttributes.java

@@ -0,0 +1,23 @@
+package com.baeldung.errorhandling.boot.configurations;
+
+import java.util.Map;
+
+import org.springframework.boot.web.servlet.error.DefaultErrorAttributes;
+import org.springframework.stereotype.Component;
+import org.springframework.web.context.request.WebRequest;
+
+@Component
+public class MyCustomErrorAttributes extends DefaultErrorAttributes {
+
+    @Override
+    public Map<String, Object> getErrorAttributes(WebRequest webRequest, boolean includeStackTrace) {
+        Map<String, Object> errorAttributes = super.getErrorAttributes(webRequest, includeStackTrace);
+        errorAttributes.put("locale", webRequest.getLocale()
+            .toString());
+        errorAttributes.remove("error");
+        errorAttributes.put("cause", errorAttributes.get("message"));
+        errorAttributes.remove("message");
+        errorAttributes.put("status", String.valueOf(errorAttributes.get("status")));
+        return errorAttributes;
+    }
+}

spring-boot-rest/src/main/java/com/baeldung/errorhandling/boot/configurations/MyErrorController.java

@@ -0,0 +1,31 @@
+package com.baeldung.errorhandling.boot.configurations;
+
+import java.util.Map;
+
+import javax.servlet.http.HttpServletRequest;
+
+import org.springframework.boot.autoconfigure.web.ErrorProperties;
+import org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController;
+import org.springframework.boot.web.servlet.error.ErrorAttributes;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Component;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+@Component
+public class MyErrorController extends BasicErrorController {
+
+    public MyErrorController(ErrorAttributes errorAttributes) {
+        super(errorAttributes, new ErrorProperties());
+    }
+
+    @RequestMapping(produces = MediaType.APPLICATION_XML_VALUE)
+    public ResponseEntity<Map<String, Object>> xmlError(HttpServletRequest request) {
+        Map<String, Object> body = getErrorAttributes(request, isIncludeStackTrace(request, MediaType.APPLICATION_XML));
+        body.put("xmlkey", "the XML response is different!");
+        HttpStatus status = getStatus(request);
+        return new ResponseEntity<>(body, status);
+    }
+
+}

spring-boot-rest/src/main/java/com/baeldung/errorhandling/boot/web/FaultyRestController.java

@@ -0,0 +1,15 @@
+package com.baeldung.errorhandling.boot.web;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class FaultyRestController {
+    
+    @GetMapping("/exception")
+    public ResponseEntity<Void> requestWithException() {
+        throw new NullPointerException("Error in the faulty controller!");
+    }
+
+}

spring-boot-rest/src/main/java/com/baeldung/web/SpringBootRestApplication.java

@@ -1,4 +1,4 @@
-package com.baeldung;
+package com.baeldung.web;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;

spring-boot-rest/src/main/resources/errorhandling-application.properties

@@ -0,0 +1,3 @@
+
+#server.error.whitelabel.enabled=false
+#server.error.include-stacktrace=always