Merge pull request #8911 from kwoyke/JAVA-86

JAVA-86: Create spring-boot-basic-customization module

spring-boot-modules/pom.xml

@@ -20,6 +20,7 @@
         <module>spring-boot-annotations</module>
         <module>spring-boot-artifacts</module>
         <module>spring-boot-autoconfiguration</module>
+        <module>spring-boot-basic-customization</module>
         <module>spring-boot-bootstrap</module>
         <module>spring-boot-client</module>
         <module>spring-boot-config-jpa-error</module>

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

@@ -0,0 +1,13 @@
+## Spring Boot Basic Customization
+
+This module contains articles about Spring Boot customization
+
+### Relevant Articles:
+
+ - [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: Configuring a Main Class](https://www.baeldung.com/spring-boot-main-class)
+ - [How to Define a Spring Boot Filter?](https://www.baeldung.com/spring-boot-add-filter)
+ - [Guide to the Favicon in Spring Boot](https://www.baeldung.com/spring-boot-favicon)

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

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>spring-boot-basic-customization</artifactId>
+    <name>spring-boot-basic-customization</name>
+    <packaging>jar</packaging>
+    <description>Module For Spring Boot Basic Customization</description>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-boot-2</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../../parent-boot-2</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <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>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <!-- The main class to start by executing "java -jar" -->
+        <start-class>com.baeldung.changeport.CustomApplication</start-class>
+    </properties>
+</project>

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/bootcustomfilters/FilterConfig.java

@@ -0,0 +1,23 @@
+package com.baeldung.bootcustomfilters;
+
+import com.baeldung.bootcustomfilters.filters.RequestResponseLoggingFilter;
+import org.springframework.boot.web.servlet.FilterRegistrationBean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class FilterConfig {
+
+    // uncomment this and comment the @Component in the filter class definition to register only for a url pattern
+    // @Bean
+    public FilterRegistrationBean<RequestResponseLoggingFilter> loggingFilter() {
+        FilterRegistrationBean<RequestResponseLoggingFilter> registrationBean = new FilterRegistrationBean<>();
+
+        registrationBean.setFilter(new RequestResponseLoggingFilter());
+
+        registrationBean.addUrlPatterns("/users/*");
+
+        return registrationBean;
+
+    }
+
+}

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/bootcustomfilters/SpringBootFiltersApplication.java

@@ -0,0 +1,17 @@
+package com.baeldung.bootcustomfilters;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+/**
+ * Boot application
+ * @author hemant
+ *
+ */
+@SpringBootApplication
+public class SpringBootFiltersApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(SpringBootFiltersApplication.class, args);
+	}
+}

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/bootcustomfilters/controller/UserController.java

@@ -0,0 +1,34 @@
+package com.baeldung.bootcustomfilters.controller;
+
+import com.baeldung.bootcustomfilters.model.User;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.UUID;
+
+/**
+ * Rest controller for User
+ * @author hemant
+ *
+ */
+@RestController
+@RequestMapping("/users")
+public class UserController {
+
+	private static final Logger LOG = LoggerFactory.getLogger(UserController.class);
+
+	@GetMapping("")
+	public List<User> getAllUsers() {
+		LOG.info("Fetching all the users");
+		return Arrays.asList(
+				new User(UUID.randomUUID().toString(), "User1", "user1@test.com"),
+				new User(UUID.randomUUID().toString(), "User1", "user1@test.com"),
+				new User(UUID.randomUUID().toString(), "User1", "user1@test.com"));
+	}
+
+}

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/bootcustomfilters/filters/RequestResponseLoggingFilter.java

@@ -0,0 +1,44 @@
+package com.baeldung.bootcustomfilters.filters;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.core.annotation.Order;
+import org.springframework.stereotype.Component;
+
+import javax.servlet.*;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+
+/**
+ * A servlet filter to log request and response
+ * The logging implementation is pretty native and for demonstration only
+ * @author hemant
+ *
+ */
+@Component
+@Order(2)
+public class RequestResponseLoggingFilter implements Filter {
+
+	private final static Logger LOG = LoggerFactory.getLogger(RequestResponseLoggingFilter.class);
+
+	@Override
+	public void init(final FilterConfig filterConfig) throws ServletException {
+		LOG.info("Initializing filter :{}", this);
+	}
+
+	@Override
+	public void doFilter(final ServletRequest request, final ServletResponse response, final FilterChain chain)
+			throws IOException, ServletException {
+		HttpServletRequest req = (HttpServletRequest) request;
+		HttpServletResponse res = (HttpServletResponse) response;
+		LOG.info("Logging Request  {} : {}", req.getMethod(), req.getRequestURI());
+		chain.doFilter(request, response);
+		LOG.info("Logging Response :{}", res.getContentType());
+	}
+
+	@Override
+	public void destroy() {
+		LOG.warn("Destructing filter :{}", this);
+	}
+}

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/bootcustomfilters/filters/TransactionFilter.java

@@ -0,0 +1,41 @@
+package com.baeldung.bootcustomfilters.filters;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.core.annotation.Order;
+import org.springframework.stereotype.Component;
+
+import javax.servlet.*;
+import javax.servlet.http.HttpServletRequest;
+import java.io.IOException;
+
+/**
+ * A filter to create transaction before and commit it once request completes
+ * The current implemenatation is just for demo
+ * @author hemant
+ *
+ */
+@Component
+@Order(1)
+public class TransactionFilter implements Filter {
+
+	private final static Logger LOG = LoggerFactory.getLogger(TransactionFilter.class);
+
+	@Override
+	public void init(final FilterConfig filterConfig) throws ServletException {
+		LOG.info("Initializing filter :{}", this);
+	}
+
+	@Override
+	public void doFilter(final ServletRequest request, final ServletResponse response, final FilterChain chain) throws IOException, ServletException {
+		HttpServletRequest req = (HttpServletRequest) request;
+		LOG.info("Starting Transaction for req :{}", req.getRequestURI());
+		chain.doFilter(request, response);
+		LOG.info("Committing Transaction for req :{}", req.getRequestURI());
+	}
+
+	@Override
+	public void destroy() {
+		LOG.warn("Destructing filter :{}", this);
+	}
+}

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/bootcustomfilters/model/User.java

@@ -0,0 +1,45 @@
+package com.baeldung.bootcustomfilters.model;
+
+/**
+ * User model
+ * @author hemant
+ *
+ */
+public class User {
+
+	private String id;
+	private String name;
+	private String email;
+
+	public User(String id, String name, String email) {
+		super();
+		this.id = id;
+		this.name = name;
+		this.email = email;
+	}
+
+	public String getId() {
+		return id;
+	}
+
+	public void setId(String id) {
+		this.id = id;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public String getEmail() {
+		return email;
+	}
+
+	public void setEmail(String email) {
+		this.email = email;
+	}
+
+}

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/changeport/CustomApplication.java

@@ -0,0 +1,17 @@
+package com.baeldung.changeport;
+
+import java.util.Collections;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class CustomApplication {
+
+    public static void main(String[] args) {
+        SpringApplication app = new SpringApplication(CustomApplication.class);
+        app.setDefaultProperties(Collections.singletonMap("server.port", "8083"));
+        app.run(args);
+    }
+
+}

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/changeport/ServerPortCustomizer.java

@@ -0,0 +1,15 @@
+package com.baeldung.changeport;
+
+import org.springframework.boot.web.server.ConfigurableWebServerFactory;
+import org.springframework.boot.web.server.WebServerFactoryCustomizer;
+import org.springframework.stereotype.Component;
+
+//@Component
+public class ServerPortCustomizer implements WebServerFactoryCustomizer<ConfigurableWebServerFactory> {
+
+    @Override
+    public void customize(ConfigurableWebServerFactory factory) {
+        factory.setPort(8086);
+    }
+
+}

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

@@ -0,0 +1,13 @@
+package com.baeldung.errorhandling;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication(scanBasePackages = "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/java/com/baeldung/failureanalyzer/FailureAnalyzerApplication.java

@@ -0,0 +1,14 @@
+package com.baeldung.failureanalyzer;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+import javax.annotation.security.RolesAllowed;
+
+@SpringBootApplication
+public class FailureAnalyzerApplication {
+    @RolesAllowed("*")
+    public static void main(String[] args) {
+        SpringApplication.run(FailureAnalyzerApplication.class, args);
+    }
+}

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/failureanalyzer/MyBeanNotOfRequiredTypeFailureAnalyzer.java

@@ -0,0 +1,22 @@
+package com.baeldung.failureanalyzer;
+
+import org.springframework.beans.factory.BeanNotOfRequiredTypeException;
+import org.springframework.boot.diagnostics.AbstractFailureAnalyzer;
+import org.springframework.boot.diagnostics.FailureAnalysis;
+
+public class MyBeanNotOfRequiredTypeFailureAnalyzer extends AbstractFailureAnalyzer<BeanNotOfRequiredTypeException> {
+
+    @Override
+    protected FailureAnalysis analyze(Throwable rootFailure, BeanNotOfRequiredTypeException cause) {
+        return new FailureAnalysis(getDescription(cause), getAction(cause), cause);
+    }
+
+    private String getDescription(BeanNotOfRequiredTypeException ex) {
+        return String.format("The bean %s could not be injected as %s because it is of type %s", ex.getBeanName(), ex.getRequiredType().getName(), ex.getActualType().getName());
+    }
+
+    private String getAction(BeanNotOfRequiredTypeException ex) {
+        return String.format("Consider creating a bean with name %s of type %s", ex.getBeanName(), ex.getRequiredType().getName());
+    }
+
+}

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/failureanalyzer/MyDAO.java

@@ -0,0 +1,5 @@
+package com.baeldung.failureanalyzer;
+
+public class MyDAO {
+
+}

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/failureanalyzer/MySecondDAO.java

@@ -0,0 +1,8 @@
+package com.baeldung.failureanalyzer;
+
+import org.springframework.stereotype.Repository;
+
+@Repository("myDAO")
+public class MySecondDAO {
+
+}

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/failureanalyzer/MyService.java

@@ -0,0 +1,13 @@
+package com.baeldung.failureanalyzer;
+
+import org.springframework.stereotype.Service;
+
+import javax.annotation.Resource;
+
+@Service
+public class MyService {
+
+    @Resource(name = "myDAO")
+    private MyDAO myDAO;
+
+}

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/favicon/FaviconApplication.java

@@ -0,0 +1,12 @@
+package com.baeldung.favicon;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class FaviconApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(FaviconApplication.class, args);
+    }
+}

spring-boot-modules/spring-boot-basic-customization/src/main/java/com/baeldung/favicon/config/FaviconConfiguration.java

@@ -0,0 +1,45 @@
+package com.baeldung.favicon.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.core.io.Resource;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.servlet.handler.SimpleUrlHandlerMapping;
+import org.springframework.web.servlet.resource.ResourceHttpRequestHandler;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+@Configuration
+public class FaviconConfiguration {
+
+    @Bean
+    public SimpleUrlHandlerMapping myFaviconHandlerMapping() {
+        SimpleUrlHandlerMapping mapping = new SimpleUrlHandlerMapping();
+        mapping.setOrder(Integer.MIN_VALUE);
+        mapping.setUrlMap(Collections.singletonMap("/favicon.ico", faviconRequestHandler()));
+        return mapping;
+    }
+
+    @Bean
+    protected ResourceHttpRequestHandler faviconRequestHandler() {
+        ResourceHttpRequestHandler requestHandler = new ResourceHttpRequestHandler();
+        ClassPathResource classPathResource = new ClassPathResource("com/baeldung/images");
+        List<Resource> locations = Arrays.asList(classPathResource);
+        requestHandler.setLocations(locations);
+        return requestHandler;
+    }
+
+    //    @Controller
+    static class FaviconController {
+
+        @RequestMapping(value = "favicon.ico", method = RequestMethod.GET)
+        @ResponseBody
+        void favicon() {
+        }
+    }
+}

spring-boot-modules/spring-boot-basic-customization/src/main/resources/META-INF/spring.factories

@@ -0,0 +1,2 @@
+org.springframework.boot.diagnostics.FailureAnalyzer=com.baeldung.failureanalyzer.MyBeanNotOfRequiredTypeFailureAnalyzer
+

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

@@ -0,0 +1,10 @@
+#server
+server.port=9000
+spring.mvc.servlet.path=/
+server.servlet.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/application.properties

@@ -0,0 +1,7 @@
+#spring.banner.charset=UTF-8
+#spring.banner.location=classpath:banner.txt
+#spring.banner.image.location=classpath:banner.gif
+#spring.banner.image.width= //TODO
+#spring.banner.image.height= //TODO
+#spring.banner.image.margin= //TODO
+#spring.banner.image.invert= //TODO

spring-boot-modules/spring-boot-basic-customization/src/main/resources/banner.txt

@@ -0,0 +1,14 @@
+@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@@@@@@@@#@@@@@########@@@@@@@@@@@@@@@@@@@@@@@@...@@@@@@@@@:..@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@@@@@#.  @@@@@*         *@@@@@@@@@@@@@@@@@@@@@   @@@@@@@@@.  @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@#o       @@@@@*  @@@@@*  @@@:*.*@@@@@@@: *8@@@   @@@@&:.#@.  @o**@@@@**:@o*o@@:.:@@@@@:.o#@&*:@@@@
+@@@@@@@@@@@@*             @@@@@*  8888   8@  @@@8  #@o  8@#  .@   @@*   :.    @*  @@@@   @.    :   &@   **    .@@@@
+@@@@@@@@@@.         @    o@@@@@*         *@@@o::&  .*  8@@@@.     @@  8@@@@.  @*  @@@@   @.  @@@&  *   @@@@#  .@@@@
+@@@@@@@@@&         @     @@@@@@*  @@@@@@  8  @@@@  ..  o&&&&&&&   @@  #@@@@.  @*  @@@@   @.  @@@#  *   @@@@@  .@@@@
+@@@@@@@@@        @@o    @@@@@@@*  oooo*   8  @@@&   @*  @@@   #   88.   88.   *&  o#:    @.  @@@#  *@   &#&   .@@@@
+@@@@@@@@#      @@@8     @@@@@@@*      .*@@@#.  *@@  @@@&   :#@@@o  .@@:  *&@8  @o   o@@: @.  @@@#  *@@#. :8#  .@@@@
+@@@@@@@@@    @@@@     &@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@# o@@@@   @@@@@
+@@@@@&    &@@@@      8@@@@@@@@@8&8@@@@@#8#@@@o8@#&@@o&@@@&@@8@@&@@@@88@@8#@8&@@##@@@@@@#8@@#8@@88@@@@@     *@@@@@@@
+@@@#  #@@@@#.      @@@@@@@@@@@@@8@@8#o@&#@@@@o.@o*@@*.@@@.@&:8o8*@@@8&@@#@@@8@@@@8@#@@@8&@@@@@@#@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

spring-boot-modules/spring-boot-basic-customization/src/main/resources/logback.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

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>

spring-boot-modules/spring-boot-basic-customization/src/test/java/com/baeldung/failureanalyzer/FailureAnalyzerAppIntegrationTest.java

@@ -0,0 +1,45 @@
+package com.baeldung.failureanalyzer;
+
+import ch.qos.logback.classic.spi.ILoggingEvent;
+import com.baeldung.failureanalyzer.utils.ListAppender;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.BeanCreationException;
+import org.springframework.boot.SpringApplication;
+
+import java.util.Collection;
+import java.util.stream.Collectors;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class FailureAnalyzerAppIntegrationTest {
+
+    private static final String EXPECTED_ANALYSIS_DESCRIPTION_TITLE = "Description:";
+    private static final String EXPECTED_ANALYSIS_DESCRIPTION_CONTENT = "The bean myDAO could not be injected as com.baeldung.failureanalyzer.MyDAO because it is of type com.baeldung.failureanalyzer.MySecondDAO";
+    private static final String EXPECTED_ANALYSIS_ACTION_TITLE = "Action:";
+    private static final String EXPECTED_ANALYSIS_ACTION_CONTENT = "Consider creating a bean with name myDAO of type com.baeldung.failureanalyzer.MyDAO";
+
+    @BeforeEach
+    public void clearLogList() {
+        ListAppender.clearEventList();
+    }
+
+    @Test
+    public void givenBeanCreationErrorInContext_whenContextLoaded_thenFailureAnalyzerLogsReport() {
+        try {
+            SpringApplication.run(FailureAnalyzerApplication.class);
+        } catch (BeanCreationException e) {
+            Collection<String> allLoggedEntries = ListAppender.getEvents()
+                .stream()
+                .map(ILoggingEvent::getFormattedMessage)
+                .collect(Collectors.toList());
+            assertThat(allLoggedEntries).anyMatch(entry -> entry.contains(EXPECTED_ANALYSIS_DESCRIPTION_TITLE))
+                .anyMatch(entry -> entry.contains(EXPECTED_ANALYSIS_DESCRIPTION_CONTENT))
+                .anyMatch(entry -> entry.contains(EXPECTED_ANALYSIS_ACTION_TITLE))
+                .anyMatch(entry -> entry.contains(EXPECTED_ANALYSIS_ACTION_CONTENT));
+            return;
+        }
+        throw new IllegalStateException("Context load should be failing due to a BeanCreationException!");
+    }
+
+}

spring-boot-modules/spring-boot-basic-customization/src/test/java/com/baeldung/failureanalyzer/utils/ListAppender.java

@@ -0,0 +1,25 @@
+package com.baeldung.failureanalyzer.utils;
+
+import ch.qos.logback.classic.spi.ILoggingEvent;
+import ch.qos.logback.core.AppenderBase;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ListAppender extends AppenderBase<ILoggingEvent> {
+    
+    static private List<ILoggingEvent> events = new ArrayList<>();
+
+    @Override
+    protected void append(ILoggingEvent eventObject) {
+        events.add(eventObject);
+    }
+    
+    public static List<ILoggingEvent> getEvents() {
+        return events;
+    }
+    
+    public static void clearEventList() {
+        events.clear();
+    }
+}

spring-boot-modules/spring-boot-basic-customization/src/test/resources/logback-test.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <include
+            resource="org/springframework/boot/logging/logback/base.xml" />
+    <appender name="LISTAPPENDER"
+              class="com.baeldung.failureanalyzer.utils.ListAppender">
+    </appender>
+    <logger
+            name="org.springframework.boot.diagnostics.LoggingFailureAnalysisReporter">
+        <appender-ref ref="LISTAPPENDER" />
+    </logger>
+    <root level="info">
+        <appender-ref ref="CONSOLE" />
+    </root>
+</configuration>