Tag Archives: REST

How To: AngularJS User Interface to CRUD Spring Boot REST API

In this post, we will add an user interface using AngularJS to the REST api we created here.

Controller for home page

First we will create a controller in Spring Boot rest api to call our home page. All the requests that will come to web server, will go through this controller and controller will return a home page for the request based on path.

MainController.java will look like below:


package com.betterjavacode.benefits.controller;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
public class MainController {

public static final Logger LOGGER = LogManager.getLogger(MainController.class);

@RequestMapping(value = "/home", method = RequestMethod.GET)
public String homepage() {
LOGGER.info(" Enter >> homepage() ");
return "index";
}
}

Any request coming to https://localhost:8443/home will return a page from index.html.

Create a Home Page

Now, we will create an index.html page. We will also be using angular JS framework as part of this home page so that we can build a single page application. If you are not aware of Angular JS or new to this framework, you can read about it AngularJS. One thing to remember while creating this page is a directory structure. Lot of issues that arise to create html pages are because of directory structure. Directory structure will look like below:

directorystructure

The home page index.html page is under main/resources/templates/ directory and it looks like below


<html ng-app="benefitApp">

<head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /><title>Benefit Application</title>

<script>document.write('<base href="' + document.location + '" />');</script>

	<link rel="stylesheet" href="/css/bootstrap.css" />

<script src="https://code.angularjs.org/1.6.1/angular.js"></script>

<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.1/angular-route.js"></script>

<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.1/angular-resource.js"></script>

<script type="text/javascript" src="./js/app.js"></script>

</head>

<body ng-controller="MainCtrl">

Hello {{name}}!
<div>
<ul class="menu">
	<li><a href="listUser">user-list</a></li>
	<li><a href="listCompany">company-list</a></li>
</ul>
<div ng-view="ng-view"></div>
</div>
</body></html>

Home page shows that this is an angular app with name “benefitApp”. This also declares a controller “MainCtrl” with an angular view. Important to see we are importing angular.js, angular-route.js and angular-resource.js modules. Click on user-list or company-list, will show list of users and list of companies respectively.

Create a controller

Now to handle the controller (MainCtrl), we added in index.html, we will add app.js which will declare the controller. This javascript file also contains config data to handle all the routing of pages. That’s why we will be importing “ngRoute” and “ngResource” angular modules.


var app = angular.module('benefitApp', ['ngRoute','ngResource']);

var app = angular.module('benefitApp', ['ngRoute','ngResource']);
app.controller('MainCtrl', function($scope, $routeParams) {

$scope.name = 'World';

$scope.$routeParams = $routeParams;

})

Through out the interaction on web pages, we will be using different controllers for editing user or company information and creating user or company. The same file app.js will also handle routing of these pages which is shown below


app.config(function($routeProvider,$locationProvider) {

$locationProvider.html5Mode(true);

$routeProvider.when('/listUser',

{templateUrl: 'views/listUser.html', controller: 'userController'});

$routeProvider.when('/listCompany',

{templateUrl: 'views/listCompany.html', controller: 'companyController'});

$routeProvider .when('/editUser/:userId',

{ templateUrl : 'views/editUser.html' }) ;

$routeProvider .when('/editCompany/:companyId',

{ templateUrl : 'views/editCompany.html' }) ;

$routeProvider.when('/createUser',

{templateUrl:'views/createUser.html'});

$routeProvider.when('/createCompany',

{templateUrl:'views/createCompany.html'});

});

Rest of the code showing all controllers’ logic has been skipped for post purposes. It is available on github repository.

UserController or CompanyController are calling rest apis which we have built using Spring boot.

Demo

Now build the code and run our embedded tomcat webserver. Fire up the url https://localhost:8443/home – it will look like below:

homepage

Click on user-list and it will show list of users inside the same page as below:

listofuserspage

Click on edit button and we will see a form to update user information:

edituserpage

Download –

In this post, we showed how to create a simple CRUD user interface using angular JS for Spring Boot REST api. The code for this is available at repository

Producing and Consuming SOAP Webservice with Spring Boot – Part V

In last few posts, we have covered following

  1. Spring Boot REST CRUD API – Part I
  2. Swagger Documentation for Spring Boot REST API – Part II
  3. Error Handling and logging in Spring Boot REST API – Part III
  4. Consuming RESTful Webservice – Part IV

In this post, we will describe how to create a SOAP webservice from our existing Spring Boot REST API. This SOAP webservice will provide us user data from the database which is we have connected through Spring-data in Spring REST API.

1. Requirements

  1. Eclipse Mars2
  2. Maven 3.1 and above
  3. Spring 1.4 and above
  4. Java 7
  5. Tomcat 8

2. SOAP Web Service

We will use our existing Spring Boot REST API to build an application that will act as a SOAP web service to provide users data. For a given user id, web service will return user data.

Let’s create a schema file in src/main/resources directory and maven will create java classes based on this schema file.


<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:tns="https://betterjavacode.com/benefits/soap"
targetNamespace="https://betterjavacode.com/benefits/soap" elementFormDefault="qualified">
<xs:element name="getUserRequest">
<xs:complexType>
<xs:sequence>
<xs:element name="id" type="xs:int"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="getUserResponse">
<xs:complexType>
<xs:sequence>
<xs:element name="user" type="tns:user"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:complexType name="user">
<xs:sequence>
<xs:element name="id" type="xs:int"/>
<xs:element name="firstname" type="xs:string"/>
<xs:element name="middlename" type="xs:string"/>
<xs:element name="lastname" type="xs:string"/>
<xs:element name="username" type="xs:string"/>
<xs:element name="createdate" type="xs:date"/>
<xs:element name="jobtitle" type="xs:string"/>
<xs:element name="email" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:schema>

3. Update Maven dependencies

Now to generate classes from schema, we have to make sure we have all the right dependencies in our pom.xml. We will also add spring boot service dependency to create a SOAP web service.


<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.betterjavacode</groupId>
<artifactId>Benefits</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>Benefits Maven Webapp</name>
<url>http://maven.apache.org</url>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.2.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
</dependency>
<dependency>
<groupId>io.swagger</groupId>
<artifactId>swagger-jersey2-jaxrs</artifactId>
<version>1.5.12</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.6.1</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>2.6.1</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web-services</artifactId>
</dependency>
<dependency>
<groupId>wsdl4j</groupId>
<artifactId>wsdl4j</artifactId>
</dependency>
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.1</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>2.6</version>
<configuration>
<warSourceDirectory>WebContent</warSourceDirectory>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>jaxb2-maven-plugin</artifactId>
<version>1.6</version>
<executions>
<execution>
<id>xjc</id>
<goals>
<goal>xjc</goal>
</goals>
</execution>
</executions>
<configuration>
<schemaDirectory>${project.basedir}/src/main/resources/</schemaDirectory>
<outputDirectory>${project.basedir}/src/main/java</outputDirectory>
<clearOutputDir>false</clearOutputDir>
<schemaLanguage>WSDL</schemaLanguage>
<generatePackage>com.betterjavacode.benefits.soap</generatePackage>
<forceRegenerate>true</forceRegenerate>
<scehmas>
<schema>
<url>http://localhost:8080/benefits/endpoints/users.wsdl</url>
</schema>
</scehmas>
</configuration>
</plugin>
</plugins>
<finalName>Benefits</finalName>
</build>
</project>

If we run the project with maven build now, the plugin jaxb2-maven-plugin will generate classes under com.betterjavacode.benefits.soap directory. It will also enable our wsdl SOAP url for users. This will generate following java objects

  • GetUserRequest
  • GetUserResponse
  • ObjectFactory
  • package-info
  • User

4. Defining the service

Next, we will define an interface for our service. This will look like below


package com.betterjavacode.benefits.services;

public interface UserAccountService

{

public com.betterjavacode.benefits.soap.User getUserDetails(int id);
}

Implementation of this service will be mapping out entity class User to generated class for soap service User. Using the id as a key to get user data from repository, we will map to soap service user. For post purposes, we will not show the implementation of this interface.

5. Creating the Service Endpoint

What is a service endpoint? When a SOAP request for defined URL is handled by Spring servlet, Spring servlet redirects that request to service endpoint. Service endpoint then processes that request to create a response. Our spring-boot-starter-web-services dependency will bring all the necessary classes for annotation purposes.


package com.betterjavacode.benefits.services.endpoints;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.ws.server.endpoint.annotation.Endpoint;
import org.springframework.ws.server.endpoint.annotation.PayloadRoot;
import org.springframework.ws.server.endpoint.annotation.RequestPayload;
import org.springframework.ws.server.endpoint.annotation.ResponsePayload;

import com.betterjavacode.benefits.services.UserAccountService;
import com.betterjavacode.benefits.soap.GetUserRequest;
import com.betterjavacode.benefits.soap.GetUserResponse;
import com.betterjavacode.benefits.soap.User;

@Endpoint
public class UserAccountServiceEndpoint

{

// private static final String TARGET_NAMESPACE =              "http://com/betterjavacode/benefits/webservices/useraccountservice";
private static final String TARGET_NAMESPACE =   "https://betterjavacode.com/benefits/soap";

@Autowired
private UserAccountService userAccountService;

@PayloadRoot(localPart = "getUserRequest", namespace = TARGET_NAMESPACE)
public @ResponsePayload GetUserResponse getUserRequest(@RequestPayload    GetUserRequest request)

{
GetUserResponse response = new GetUserResponse();
User user = userAccountService.getUserDetails(request.getId());
response.setUser(user);
return response;
}
}

@Endpoint annotation allows the class to be defined as service endpoint and included in @Component annotation for scanning. Make sure the namespace defined in this class matches with XSD schema definition. Otherwise, you can run into error for “No Endpoint defined for“.

6. Configuration

Next, we will configure our configuration class to generate wsdl endpoint. This configuration class will be annotated by @EnableWs to provide web service configuration.


package com.betterjavacode.benefits;

import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;
import org.springframework.ws.config.annotation.EnableWs;
import org.springframework.ws.config.annotation.WsConfigurerAdapter;
import org.springframework.ws.transport.http.MessageDispatcherServlet;
import org.springframework.ws.wsdl.wsdl11.DefaultWsdl11Definition;
import org.springframework.xml.xsd.SimpleXsdSchema;
import org.springframework.xml.xsd.XsdSchema;

@Configuration
@EnableWs
@ComponentScan("com.betterjavacode")
public class AppConfig extends WsConfigurerAdapter {

@Bean
public ServletRegistrationBean messageDispatcherServlet(ApplicationContext applicationContext) {
MessageDispatcherServlet servlet = new MessageDispatcherServlet();
servlet.setApplicationContext(applicationContext);

return new ServletRegistrationBean(servlet, "/benefits/endpoints/*");
}

@Bean(name = "users")
public DefaultWsdl11Definition defaultWsdl11Definition(XsdSchema usersSchema) {
DefaultWsdl11Definition wsdl11definition = new DefaultWsdl11Definition();
wsdl11definition.setPortTypeName("UserAccountService");
wsdl11definition.setLocationUri("/endpoints");
wsdl11definition.setTargetNamespace("http://com/betterjavacode/benefits/webservices/useraccountservice");
wsdl11definition.setSchema(usersSchema);
return wsdl11definition;
}

@Bean
public XsdSchema usersSchema() {
return new SimpleXsdSchema(new ClassPathResource("employees.xsd"));
}

}

Few important points about this configuration class are

  • MessageDispatcherServlet is a required servlet to dispatch web service messages. We set this servlet with a bean to handle the URL from which request will be coming.
  • DefaultWsdl11Definition creates SOAP for the given XSD schema
  • XsdSchema provides abstraction for our users XSD schema

7. Running the SOAP webservice

Now build our project with maven. Run the spring boot application through eclipse to start the embedded tomcat server. Once the tomcat server starts, if we access url http://localhost:8080/benefits/endpoints/users.wsdl

Output in the browser will be as below

wsdl endpoint

 

Here we showed how to create a simple SOAP webservice which we have combined with Spring Boot REST API service. We can also test this SOAP webservice using Soap UI, as shown in below screenshot

SoapUITest

8. Consuming the SOAP web service

In previous steps, we showed how to produce a SOAP web service, now we will show how to consume this SOAP web service programmatically.

8.1 Create a client class

Under package com.betterjavacode.benefits.views, define a class UserClient which will extend a WebServiceGatewaySupport class. WebServiceGatewaySupport class provides web service methods.


package com.betterjavacode.benefits.views;

import org.springframework.ws.client.core.support.WebServiceGatewaySupport;
import org.springframework.ws.soap.client.core.SoapActionCallback;

import com.betterjavacode.benefits.soap.GetUserRequest;
import com.betterjavacode.benefits.soap.GetUserResponse;

public class UserClient extends WebServiceGatewaySupport {

public GetUserResponse getUserById(int userid) {
GetUserRequest userrequest = new GetUserRequest();
userrequest.setId(userid);
GetUserResponse response = (GetUserResponse) getWebServiceTemplate().marshalSendAndReceive(userrequest, new SoapActionCallback("http://localhost:8080/benefits/endpoints/getUserResponse"));
return response;
}
}

8.2 Configure the client for Spring Bean support

We will configure Jaxb2Marshaller to support JAXB to set context path. This will help us marshal and unmarshal our xml request and response through.


package com.betterjavacode.benefits.views;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.oxm.jaxb.Jaxb2Marshaller;

@Configuration
public class ClientAppConfig {
@Bean
public Jaxb2Marshaller marshaller() {
Jaxb2Marshaller marshaller = new Jaxb2Marshaller();
marshaller.setContextPath("com.betterjavacode.benefits.soap");
return marshaller;
}

@Bean
public UserClient userClient(Jaxb2Marshaller marshaller) {
// WSDL URL - http://localhost:8080/benefits/endpoints/users.wsdl
UserClient uc = new UserClient();
uc.setDefaultUri("http://localhost:8080/benefits/endpoints/users.wsdl");
uc.setMarshaller(marshaller);
uc.setUnmarshaller(marshaller);
return uc;
}
}

 

8.3 Run the SOAP web service client

We will define a class with main method to pass an argument of user id. Our client will call the web service with passed argument to return us the data if that user id existed in the database.


public class UserSoapClient {

    public static void main(String[] args) {
        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
        ctx.register(ClientAppConfig.class);
        ctx.refresh();
        UserClient usc = ctx.getBean(UserClient.class);
        System.out.println(" For Employee: ");
        GetUserResponse response = usc.getUserById(1);
        System.out.println("Name: " + response.getUser()
            .getFirstname() + " "
            + response.getUser()
                .getLastname());
        System.out.println(" Job: " + response.getUser()
            .getJobtitle());

    }

}

 

9. Conclusion

In this article, we showed how to create a SOAP web service and how to build a client to consume the same SOAP web service using Spring Boot. The code for this is available at github

10. References

  1. Spring Web services tutorial
  2. SOAP Web service producer and consumer
  3. Consuming a web service in java and SOAP UI

Consuming a RESTful Webservice – Part IV

Continuing the series of posts on Spring Boot, in this post, we will investigate how to consume a REST API service we built previously. This will be a short post, but we will show how to read the data and how to post the data with some of the features Spring Boot offers to consume a REST service for client side. Eventual goal is to use this feature to call our rest service during runtime to use the data from database to display on views which a user will be able to see.

You can read previous posts on this series Part I, Part II and Part III .

Purpose

Purpose of this post is to read company data from Company REST API and also to create a company by posting company data using the same REST API.

Build a client

To consume a rest service programmatically, Spring provides a feature called RestTemplate. RestTemplate is easiest way for client to interact with server side code with just one line of code.

In our client code, we will need a RestTemplate object, REST service URL. Since this is a sample we are building, we will be adding a main method in this class to run this client side of the code. In real life scenarios, during runtime, a client code will call rest template to get server side data, use that data to massage or display to user on user interface.


RestTemplate restTemplate = new RestTemplate();
String resourceAPI_URL = "http://localhost:8080/benefits/v1/companies/{id}";
Company company = restTemplate.getForObject(resourceAPI_URL, Company.class, 1);

This code is showing that we are calling REST service to read company data for company with id that a client will pass.

Similarly, we will have another request to post the data on server side to create a company. The code for that will look like below:


String resourceAPI_POSTURL = "http://localhost:8080/benefits/v1/companies/";
Company comp = new Company();
comp.setName("XYZ Company");
comp.setStatusid(1);
comp.setType("Corporation");
comp.setEin("9343423232");
// comp.setCp(cp);
Company newcomp = restTemplate.postForObject(resourceAPI_POSTURL, comp, Company.class);

In this post, we showed how to use RestTemplate a feature that spring boot provides to consume a REST service. The code for this is available here

Error Handling and Logging in Spring Boot REST API – Part III

In previous posts, I wrote about how to create a spring boot REST API Part I and how to add swagger documentation for REST API Part II. In this post, we will add error handling and logging to our REST API. Error handling and Logging are two different ideas, so I will divide this post in two sections.

1. Logging

In most production applications, logging is critical and it is used for multiple purposes. Few of those uses are debugging the production issues or auditing for the application. Over the years, different logging libraries have evolved to use in java based applications. slf4j is the most popular framework as it provides a simple abstraction layer to any kind of logging framework.

In our tutorial for this application, we will be using log4j2 which is the most recent and advance logging library out there. It provides lot of useful features for performance, support for multiple APIs, advance filtering, automatic reloading of configurations etc. We will not cover any of these in this article, if you are interested to read about log4j2 libraries, read here.

Add log4j2 library in application –

To use log4j2, we will add the maven dependency to our project’s pom file. This should look like below

 <dependency>
 <groupId>org.apache.logging.log4j</groupId>
 <artifactId>log4j-api</artifactId>
 </dependency>
 <dependency>
 <groupId>org.apache.logging.log4j</groupId>
 <artifactId>log4j-core</artifactId>
 </dependency>

Add log4j2 configuration file

To enable logging, we will have to add a configuration file in our application. This configuration file can be XML, JSON or YAML file. We will be using a XML file log4j2.xml which will look like below

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="INFO">
 <Appenders>
 <Console name="Console" target="SYSTEM_OUT">
 <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
 </Console>
 <File name="BenefitsFile" fileName="benefits.log" append="true">
 <PatternLayout pattern="%d{yyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
 </File>
 </Appenders>
 <Loggers>
 <Root level="debug">
 <AppenderRef ref="Console" />
 <AppenderRef ref="BenefitsFile"/>
 </Root>
 </Loggers>
</Configuration>

So we are using <code> Console </code> and <code> BenefitsFile </code> as two loggers which will log into a console and file respectively. We are setting log level to DEBUG. If you log any messages with a level lower than DEBUG, they will be logged into console or file. We will have to add a file benefits.log in classpath to achieve this logging in file. Log pattern is with date time, log level, class from which log is originating and log message.

Add logging in application code

Once we have required logging libraries and logging configuration adjusted, we can add logging in our code to capture this logging during runtime execution. In one of the managers CompanyManagerImpl, we will add a logger.

public static final Logger LOGGER = LogManager.getLogger(CompanyManagerImpl.class);

@Override
public List<Company> getAllCompanies()
{
LOGGER.info(" Enter >> getAllCompanies() ");
List<Company> cList = (List<Company>) companyRepository.findAll();
LOGGER.info(" Exit << getAllCompanies() ");
return cList;
}

Now once we execute our spring boot application, we can capture the logs in console or file. The file will be benefits.log.

2. Error Handling

We will not write about exceptions in detail as it has been covered in this post Exceptions. We will create our own custom exception which will be extended from WebApplicationException which jersey library provides.

This will look like below:


package com.betterjavacode.benefits.utilities;

import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Response;

public class InvalidRequestException extends WebApplicationException {

/**
*
*/
private static final long serialVersionUID = 1L;
private int errorcode = 00; // 00 indicates - no error

public InvalidRequestException() {

}

public InvalidRequestException(int errorcode, String message) {
super(Response.status(Response.Status.BAD_REQUEST)
.entity(message)
.build());
this.errorcode = errorcode;
}

public InvalidRequestException(int errorcode, String message, Throwable cause) {
super(cause, Response.status(Response.Status.BAD_REQUEST)
.entity(message)
.build());
this.errorcode = errorcode;
}
}

Now we can use this custom exception in our managers when we want to throw an error message to indicate if there is anything wrong with client request. Similarly we can build another exception to show if there is anything wrong on server side. Following snippet shows from CompanyManagerImpl where we have shown how to throw this exception.


@Override
public Company getCompany(int guid) {
LOGGER.info(" Enter >> getCompany() ");
Company company = companyRepository.findOne(guid);
if (company == null) {
LOGGER.info(" Exit << createCompany() ");
throw new InvalidRequestException(400, "Company not found");
}
LOGGER.info(" Exit << getCompany() ");
return company;
}

In this post, we showed how to handle logging and errors in a REST API. The code for this is available on github repository.