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Exception Handler in Class

1.

2. ExceptionhandlingApplication class

package com.Exceptionhandling;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class ExceptionhandlingApplication {

public static void main(String[] args) {
SpringApplication.run(ExceptionhandlingApplication.class, args);
}
}

3. Application.properties

server.port=9009

spring.thymeleaf.cache=false

4. POM.xml

<?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">

<groupId>com.Exceptionhandling</groupId>

<artifactId>Exceptionhandling</artifactId>

<version>0.0.1-SNAPSHOT</version>

<name>Exceptionhandling</name>

<description>errorhandling project for Spring Boot</description>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-parent</artifactId>

<version>1.5.10.RELEASE</version>

</parent>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

<java.version>1.8</java.version>

</properties>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-thymeleaf</artifactId>

</dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-web</artifactId>

</dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-test</artifactId>

</dependency>

</dependencies>

<build>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-maven-plugin</artifactId>

</plugin>

</plugins>

</build>

</project>

5. Post class

package com.Exceptionhandling.domain;

import java.util.Date;

public class Post {

private String title;

private String body;

private Date posted;

private String author;

public Post() {

}

public String getTitle() {

return title;

}

public void setTitle(String title) {

this.title = title;

}

public String getBody() {

return body;

}

public void setBody(String body) {

this.body = body;

}

public Date getPosted() {

return posted;

}

public void setPosted(Date posted) {

this.posted = posted;

}

public String getAuthor() {

return author;

}

public void setAuthor(String author) {

this.author = author;

}

@Override

public String toString() {

return "Post [title=" + title + "]";

}

6. PostController Class

package com.Exceptionhandling.controller;

import javax.servlet.http.HttpServletRequest;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.ExceptionHandler;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RequestMapping;

@Controller

@RequestMapping("/posts")

public class PostController {

private static final Logger logger = LoggerFactory.getLogger(PostController.class);

@RequestMapping("/get/{slug}")

public String getPost(@PathVariable(value="slug") String slug) throws Exception{

com.Exceptionhandling.domain.Post post = null;

if( post == null ) throw new Exception("We couldn't find the post with slug: " + slug);

return "post";

}

@ExceptionHandler(Exception.class)

public String handleException(HttpServletRequest req, Exception exception, Model model){

model.addAttribute("errorMessage", exception.getMessage() );

return "postError";

}

7. PostError.html

<!DOCTYPE html>

<html lang="en"

xmlns="http://www.w3.org/1999/xhtml"

xmlns:th="http://www.thymleaf.org">

<head>

<title>Page Not Found</title>

<!--[if lt IE 9]>

<![endif]-->

</head>

<body>

<span class="sr-only">Toggle navigation</span>

</button>

<a class="navbar-brand" href="#">therealdanvega.com</a>

</div>

<p class="navbar-text navbar-right">Signed in as <a href="#" class="navbar-link">Guest User</a></p>

</div>

</nav>

<h2>Page Not Found</h2>

<p th:text="${errorMessage}">error message</p>

<p>Maybe you would like one of these posts</p>

<ul>

</ul>

</div>

</body>

</html>

7. Run the program

=====================================================

Global Exception handler

8. Now modify code PostController Class

package com.Exceptionhandling.controller;

import javax.servlet.http.HttpServletRequest;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.ExceptionHandler;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RequestMapping;

@Controller

@RequestMapping("/posts")

public class PostController {

private static final Logger logger = LoggerFactory.getLogger(PostController.class);

@RequestMapping("/get/{slug}")

public String getPost(@PathVariable(value="slug") String slug) throws Exception{

com.Exceptionhandling.domain.Post post = null;

if( post == null ) throw new Exception("We couldn't find the post with slug: " + slug);

return "post";

}

@ExceptionHandler(Exception.class)

public String handleException(HttpServletRequest req, Exception exception, Model model){

model.addAttribute("errorMessage", exception.getMessage() );

return "postError";

}

9. ErrorHandler.html

<!DOCTYPE html>

<html lang="en"

xmlns="http://www.w3.org/1999/xhtml"

xmlns:th="http://www.thymleaf.org">

<head>

<title>Global Handler</title>

<!--[if lt IE 9]>

<![endif]-->

</head>

<body>

<span class="sr-only">Toggle navigation</span>

</button>

<a class="navbar-brand" href="#">therealdanvega.com</a>

</div>

<p class="navbar-text navbar-right">Signed in as <a href="#" class="navbar-link">Guest User</a></p>

</div>

</nav>

<h2>Global Handler</h2>

<p th:text="${exception}">Exception</p>

</div>

</body>

</html>

10. Now Create ExceptionControllerAdvice Class

package com.Exceptionhandling.controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.ControllerAdvice;

import org.springframework.web.bind.annotation.ExceptionHandler;

@ControllerAdvice

public class ExceptionControllerAdvice {

@ExceptionHandler(Exception.class)

public String exception(Exception exception, Model model){

model.addAttribute("exception", exception);

return "errorHandler";

}

11. Run the program.

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