Professional Java and PL/SQL Blog

Error Handling

1. Screenshot

2. POM File
<?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>

<groupId>com.errorhandling</groupId>
<artifactId>internationalization</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

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

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.0.RELEASE</version>
<relativePath /> 
</parent>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</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-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

3.ErrorhandlingApplication Class
package com.errorhandling;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.SpringApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.http.HttpStatus;

@SpringBootApplication
public class ErrorhandlingApplication {

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

4. Error.html file

<!DOCTYPE html>

<html lang="en"

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

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

<head>

<title>Error Handling Demo</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>Standard Error Handler</h2>

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

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

</div>

</body>

</html>

5. blog.css CSS file

.navbar {

margin-top:20px;

}

header h1 {

font-family: 'Exo', sans-serif;

font-size: 38px;

}

p, address {

font-family: 'Roboto', sans-serif;

}

6. application.properties file

server.port=9009

spring.thymeleaf.cache=false

7. Run File Following output result will be displayed.

-----------------------------------------------------------------

8. Create CustomErrorController class

package com.errorhandling.controller;

import java.util.Date;

import java.util.HashMap;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.boot.web.servlet.error.ErrorAttributes;

import org.springframework.boot.web.servlet.error.ErrorController;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

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

import org.springframework.web.context.request.RequestAttributes;

import org.springframework.web.context.request.ServletRequestAttributes;

import org.springframework.web.context.request.ServletWebRequest;

import org.springframework.web.context.request.WebRequest;

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

@Controller

public class CustomErrorController implements ErrorController {

private static final String ERROR_PATH = "/error";

private static final String ERROR_TEMPLATE = "customError";

private final ErrorAttributes errorAttributes;

@Autowired

public CustomErrorController(ErrorAttributes errorAttributes) {

this.errorAttributes = errorAttributes;

}

@RequestMapping(ERROR_PATH)

//@ResponseBody

public String handleError(Model model,HttpServletRequest request) {

Map<String,Object> error = getErrorAttributes(request, true);

model.addAttribute("timestamp", error.get("timestamp"));

model.addAttribute("status", error.get("status"));

model.addAttribute("error", error.get("error"));

model.addAttribute("message", error.get("message"));

model.addAttribute("path", error.get("path"));

return ERROR_TEMPLATE;

}

@Override

public String getErrorPath() {

return "/error";

}

private Map<String, Object> getErrorAttributes(HttpServletRequest request, boolean includeStackTrace) {

// Integer statusCode = (Integer) request.getAttribute("javax.servlet.error.status_code");

// Exception exception = (Exception) request.getAttribute("javax.servlet.error.exception");

WebRequest requestAttributes = new ServletWebRequest(request);

return this.errorAttributes.getErrorAttributes(requestAttributes, includeStackTrace);

}

9. Create customError.html file inside resources/template s

<!DOCTYPE html>

<html lang="en"

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

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

<head>

<title>Error Handling Demo</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>Error Handler</h2>

<thead>

<tr>

<td>Value</td>

</tr>

</thead>

<tbody>

<tr>

<td>TimeStamp</td>

</tr>

<tr>

<td>Status</td>

</tr>

<tr>

<td>Message</td>

</tr>

<tr>

<td>Error</td>

</tr>

<tr>

</tr>

</tbody>

</table>

</div>

</body>

</html>

10. Now the Program.

11.

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