JAVA-86: spring-boot-custom-error-page

spring-boot-modules/spring-boot-basic-customization/README.md

@@ -6,3 +6,6 @@ This module contains articles about Spring Boot customization
 
  - [How to Change the Default Port in Spring Boot](https://www.baeldung.com/spring-boot-change-port)
  - [Using Custom Banners in Spring Boot](https://www.baeldung.com/spring-boot-custom-banners)
+ - [Create a Custom FailureAnalyzer with Spring Boot](https://www.baeldung.com/spring-boot-failure-analyzer)
+ - [Spring Boot: Customize Whitelabel Error Page](https://www.baeldung.com/spring-boot-custom-error-page)
+ 

spring-boot-modules/spring-boot-basic-customization/pom.xml

@@ -26,6 +26,11 @@
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
 
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-thymeleaf</artifactId>
+        </dependency>
+
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/errorhandling/ErrorHandlingApplication.java

@@ -0,0 +1,15 @@
+package com.baeldung.errorhandling;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.ComponentScan;
+
+@SpringBootApplication
+@ComponentScan(basePackages = "com.baeldung.errorhandling")
+public class ErrorHandlingApplication {
+
+    public static void main(String [] args) {
+        System.setProperty("spring.profiles.active", "errorhandling");
+        SpringApplication.run(ErrorHandlingApplication.class, args);
+    }
+}

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/errorhandling/controllers/IndexController.java

@@ -0,0 +1,26 @@
+package com.baeldung.errorhandling.controllers;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+
+@Controller
+public class IndexController {
+
+    @GetMapping(value = {"/", ""})
+    public String index() {
+        return "index";
+    }
+
+    @GetMapping(value = {"/server_error"})
+    public String triggerServerError() {
+        "ser".charAt(30);
+        return "index";
+    }
+
+    @PostMapping(value = {"/general_error"})
+    public String triggerGeneralError() {
+        return "index";
+    }
+
+}

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/errorhandling/controllers/MyErrorController.java

@@ -0,0 +1,40 @@
+package com.baeldung.errorhandling.controllers;
+
+import org.springframework.boot.web.servlet.error.ErrorController;
+import org.springframework.http.HttpStatus;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+
+import javax.servlet.RequestDispatcher;
+import javax.servlet.http.HttpServletRequest;
+
+@Controller
+public class MyErrorController implements ErrorController {
+
+    public MyErrorController() {}
+
+    @GetMapping(value = "/error")
+    public String handleError(HttpServletRequest request) {
+        
+        Object status = request.getAttribute(RequestDispatcher.ERROR_STATUS_CODE);
+
+        if (status != null) {
+        
+            Integer statusCode = Integer.valueOf(status.toString());
+
+            if(statusCode == HttpStatus.NOT_FOUND.value()) {
+                return "error-404";
+            }
+            else if(statusCode == HttpStatus.INTERNAL_SERVER_ERROR.value()) {
+                return "error-500";
+            }
+        }
+        return "error";
+    }
+
+    @Override
+    public String getErrorPath() {
+        return "/error";
+    }
+
+}

spring-boot-modules/spring-boot-basic-customization/src/main/resources/application-errorhandling.properties

@@ -0,0 +1,10 @@
+#server
+server.port=9000
+server.servlet-path=/
+server.context-path=/
+server.error.whitelabel.enabled=false
+
+#spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration
+
+#for Spring Boot 2.0+
+#spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration

spring-boot-modules/spring-boot-basic-customization/src/main/resources/templates/error-404.html

@@ -0,0 +1,7 @@
+<!DOCTYPE html>
+<html>
+<body>
+<h1> Sorry, we couldn't find the page you were looking for. </h1>
+<p><a href="/">Go Home</a></p>
+</body>
+</html>

spring-boot-modules/spring-boot-basic-customization/src/main/resources/templates/error-500.html

@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<html>
+<body>
+<h1> Sorry, something went wrong! </h1>
+
+<h2>We're fixing it.</h2>
+<p><a href="/">Go Home</a></p>
+</body>
+</html>

spring-boot-modules/spring-boot-basic-customization/src/main/resources/templates/error.html

@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<html>
+<body>
+<h1> Something went wrong! </h1>
+<h2>Our Engineers are on it.</h2>
+<p><a href="/">Go Home</a></p>
+</body>
+</html>

spring-boot-modules/spring-boot-basic-customization/src/main/resources/templates/error/404.html

@@ -0,0 +1,8 @@
+<html>
+	<head>
+		<title>RESOURCE NOT FOUND</title>
+	</head>
+	<body>
+		<h1>404 RESOURCE NOT FOUND</h1>
+	</body>
+</html>

spring-boot-modules/spring-boot-basic-customization/src/main/resources/templates/index.html

@@ -0,0 +1,6 @@
+<html>
+<body>
+<h1>Welcome Home</h1>
+<p><strong>Success!</strong> It is working as we expected.</p>
+</body>
+</html>