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<div style="font-family: calibri, sans-serif; font-size: 12pt;">Hello friends!!! Welcome again for another Spring Boot tutorial. Here we are going to discuss more detail about Spring Boot CLI (Command Line Interface). Previously we have already discussed <a href="https://dineshonjava.com/introduction-to-spring-boot-a-spring-boot-complete-guide/"><b>Introduction of Spring Boot</b></a> and <a href="https://dineshonjava.com/essentials-key-components-and-internals-of-spring-boot-framework/"><b>Essentials Key Components of Spring Boot</b></a>. The quickest way to get started with Spring Boot is to install the Spring Boot CLI so that you can start writing code.</div>
<h2 style="font-family: calibri, sans-serif; font-size: 12pt;"><b>What is Spring Boot CLI?</b></h2>
<div style="font-family: calibri, sans-serif; font-size: 12pt;">The Spring Boot CLI is a command line tool that can be used if we want to quickly develop with Spring. It allows us to run Groovy scripts, which means that we have a familiar Java-like syntax, without so much boilerplate code. We can also bootstrap a new project or write your own command for it.</div>
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<div style="font-family: calibri, sans-serif; font-size: 12pt;">It is Spring Boot software to run and test Spring Boot applications from command prompt. When we run Spring Boot applications using CLI, then it internally uses Spring Boot Starter and Spring Boot AutoConfigurate components to resolve all dependencies and execute the application.</div>
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<div style="font-family: calibri, sans-serif; font-size: 12pt;">It internally contains Groovy and Grape (JAR Dependency Manager) to add Spring Boot Defaults and resolve all dependencies automatically.</div>
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<h2 style="font-family: calibri, sans-serif; font-size: 12pt;"><b>Installing the Spring Boot CLI</b></h2>
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<div style="font-family: calibri, sans-serif; font-size: 12pt;">There are several ways to install the Spring Boot CLI:</div>
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<ul style="font-family: calibri, sans-serif; font-size: 12pt;">
<li>From a downloaded distribution</li>
<li>Using the Groovy Environment Manager</li>
<li>With OS X Homebrew</li>
<li>As a port using MacPorts</li>
</ul>
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<h2 style="font-family: calibri, sans-serif; font-size: 12pt;"><b>MANUALLY INSTALLING THE SPRING BOOT CLI</b></h2>
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<div style="font-family: calibri, sans-serif; font-size: 12pt;">We can install Spring Boot CLI software using either Windows Installer or Zip file. Both approaches are easy to install and will give us same Spring Boot CLI software.</div>
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<div style="font-family: calibri, sans-serif; font-size: 12pt;"><b>Step 1: </b>You can download the Spring CLI distribution from the Spring software repository:</div>
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<li><a style="font-size: 12pt;" href="http://repo.spring.io/snapshot/org/springframework/boot/spring-boot-cli/1.4.0.BUILD-SNAPSHOT/spring-boot-cli-1.4.0.BUILD-SNAPSHOT-bin.zip"><b>spring-boot-cli-1.4.0.BUILD-SNAPSHOT-bin.zip</b></a></li>
<li><a style="font-size: 12pt;" href="http://repo.spring.io/snapshot/org/springframework/boot/spring-boot-cli/1.4.0.BUILD-SNAPSHOT/spring-boot-cli-1.4.0.BUILD-SNAPSHOT-bin.tar.gz"><b>spring-boot-cli-1.4.0.BUILD-SNAPSHOT-bin.tar.gz</b></a></li>
</ul>
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<div style="font-family: calibri, sans-serif; font-size: 12pt;">Once downloaded, follow the <b style="font-size: 12pt;"><a href="https://raw.github.com/spring-projects/spring-boot/master/spring-boot-cli/src/main/content/INSTALL.txt" target="_blank" rel="noopener">INSTALL.txt</a></b> instructions from the unpacked archive. In summary: there is a spring script (spring.bat for Windows) in a bin/ directory in the .zip file, or alternatively you can use java -jar with the .jar file (the script helps you to be sure that the classpath is set correctly).</div>
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<div style="font-family: calibri, sans-serif; font-size: 12pt;"><b>Step 2:</b> Extract <b>spring-boot-cli-1.4.0.BUILD-SNAPSHOT-bin.zip</b> file into our local FileSystem.</div>
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<div class="separator" style="clear: both; font-family: calibri, sans-serif; font-size: 12pt; text-align: center;"><img src="https://dineshonjava.com/wp-content/uploads/2016/06/Spring-Boot-CLI.jpg" border="0" /></div>
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<div style="font-family: calibri, sans-serif; font-size: 12pt;"><b>Step 3: </b>Set Spring Boot CLI Environment Variables in Windows System as shown below.</div>
<pre class="highlight" style="font-family: calibri, sans-serif; font-size: 12pt;">set PATH= D:personal datadojspring-1.4.0.BUILD-SNAPSHOTbin 
</pre>
<div style="font-family: calibri, sans-serif; font-size: 12pt;"><b>Step 4:</b> Execute the below command to verify our installation process.</div>
<div style="font-family: calibri, sans-serif; font-size: 12pt;"><b>Using the CLI</b></div>
<div style="font-family: calibri, sans-serif; font-size: 12pt;">Once you have installed the CLI you can run it by typing spring.</div>
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<div style="font-family: calibri, sans-serif; font-size: 12pt;">We can use “spring –version” to know the Spring Boot CLI Version as shown below.</div>
<pre class="highlight" style="font-size: 12pt;">C:UsersDinesh>;spring --version 
Spring CLI v1.4.0.BUILD-SNAPSHOT 
 
</pre>
<div style="font-family: calibri, sans-serif; font-size: 12pt;">We can use “spring –help” to know the Spring Boot CLI Version as shown below.</div>
<pre class="highlight" style="font-size: 12pt;">C:UsersDinesh>;spring --help 
usage: spring [--help] [--version] 
 <;command>; [<;args>;] 
 
Available commands are: 
 
 run [options] <;files>; [--] [args] 
 Run a spring groovy script 
 
 test [options] <;files>; [--] [args] 
 Run a spring groovy script test 
……..more command help is shown here 
</pre>
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<div style="font-family: calibri, sans-serif; font-size: 12pt;">Now our Spring Boot CLI Installation process is done successfully.</div>
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<div style="font-family: calibri, sans-serif; font-size: 12pt;"><b>Quick start Spring Boot CLI Hello World Example</b></div>
<div style="font-family: calibri, sans-serif; font-size: 12pt;">Here we are using same example provided in Spring Boot Documentation.</div>
<div style="font-family: calibri, sans-serif; font-size: 12pt;">Please follow the following steps to develop a Spring Boot HelloWorld Example:</div>
<div style="font-family: calibri, sans-serif; font-size: 12pt;"><b>Step 1:</b> Create an “app” Folder in our Local FileSystem to place our groovy scripts.</div>
<div style="font-family: calibri, sans-serif; font-size: 12pt;"><b>Step 2:</b> Create a file called app.groovy</div>
<pre class="highlight" style="font-family: calibri, sans-serif; font-size: 12pt;">@RestController 
class app{ 
 @RequestMapping("/") 
 String home() { 
 "Hello World!" 
 } 
} 
</pre>
<div style="font-size: 12pt;"><b>To compile and run the application type:</b></div>
<div style="font-size: 12pt;"><i>$ spring run app.groovy</i></div>
<div style="font-size: 12pt;"></div>
<div style="font-size: 12pt;">To pass command line arguments to the application, you need to use a &#8212; to separate them from the “spring” command arguments, e.g.</div>
<div style="font-size: 12pt;"><i>$ spring run app.groovy &#8212; &#8211;server.port=9000</i></div>
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<div style="font-size: 12pt;">To set JVM command line arguments you can use the JAVA_OPTS environment variable, e.g.</div>
<div style="font-size: 12pt;"><i>$ JAVA_OPTS=-Xmx1024m spring run app.groovy</i></div>
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<div style="font-size: 12pt;"><b>Observation on Code:</b></div>
<div style="font-size: 12pt;">If we observe our <b>app.groovy</b>, we can find the following important points.</div>
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<ul style="font-size: 12pt;">
<li>No imports</li>
<li>No other XML configuration to define Spring MVC Components like Views,ViewResolver etc.</li>
<li>No web.xml and No DispatcherServlet declaration</li>
<li>No build scripts to create our Application war file</li>
<li>No need to build war file to deploy this application</li>
</ul>
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<div style="font-size: 12pt;"><b>Now for running the application </b></div>
<div style="font-size: 12pt;">Open command prompt at “<b>app</b>” Folder in our Local FileSystem.</div>
<div style="font-size: 12pt;"></div>
<div style="font-size: 12pt;"><b>Execute the following command</b></div>
<div style="font-size: 12pt;"><i>spring run app.groovy</i></div>
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<div style="font-size: 12pt;">Observe the output at “<b>spring run</b>” command console.</div>
<div class="separator" style="clear: both; font-size: 12pt; text-align: center;"><img src="https://dineshonjava.com/wp-content/uploads/2016/06/Spring-Boot-CLI-CMD-run.jpg" border="0" /></div>
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<div style="font-size: 12pt;">If we observe here, when we execute “<b><i>spring run app.groovy</i></b>”, it starts Embedded Tomcat server at Default port number: <b>8080</b>.</div>
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<div style="font-size: 12pt;">Now our Spring Boot <b>HelloWorld </b>Example application is up and running. It’s time to test it now.</div>
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<ul style="font-size: 12pt;">
<li>Open browser and access the following link.</li>
<li>Access this URL: <b><i><a href="http://localhost:8080/">http://localhost:8080/</a></i></b></li>
</ul>
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<div class="separator" style="clear: both; font-size: 12pt; text-align: center;"><img src="https://dineshonjava.com/wp-content/uploads/2016/06/Spring-Boot-CLI-response.jpg" border="0" /></div>
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<div style="font-size: 12pt;">In the above example we can observe following points.</div>
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<ul>
<li>There is no Import</li>
<li>There is no XML or JAVA configuration</li>
<li>There is no DispatcherServlet and web.xml</li>
<li>There is no build file for creating war like Maven or Gradle</li>
</ul>
<p> ;</p>
<div style="font-size: 12pt;">It is the responsibility of Spring Boot Core Components, Groovy Compiler (groovyc) and Groovy Grape (Groovy’s JAR Dependency Manager).</div>
<div style="font-size: 12pt;"></div>
<div style="font-size: 12pt;">Spring Boot Components uses Groovy Compiler and Groovy Grape to provide some Defaults lime adding required imports, providing required configuration, resolving jar dependencies, adding main() method etc. As a Spring Boot Developer, We don’t need to worry all these things. Spring Boot Framework will take care of all these things for us.</div>
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<div style="font-size: 12pt;">That’s the beauty of Spring Boot Framework.</div>
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<div style="font-size: 12pt;"><b>Default import statements</b></div>
<div style="font-size: 12pt;">To help reduce the size of your Groovy code, several import statements are automatically included. Notice how the example above refers to @Component,@RestController and @RequestMapping without needing to use fully-qualified names or import statements.</div>
<div style="font-size: 12pt;"></div>
<div style="font-size: 12pt;"><b>Automatic main method</b></div>
<div style="font-size: 12pt;">Unlike the equivalent Java application, you do not need to include a public static void main(String[] args) method with your Groovy scripts. ASpringApplication is automatically created, with your compiled code acting as the source.</div>
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<p><b>Summary</b></p>
<div style="font-size: 12pt;">The Spring Boot CLI takes the simplicity offered by Spring Boot auto-configuration and starter dependencies and turns it up a notch. Using the elegance of the Groovy language, the CLI makes it possible to develop Spring applications with minimal code noise.</div>
<p> ;</p>
<div style="background-color: #f2f9fc; border-radius: 3px; border: 1px solid #c9e6f2; line-height: 1.45; padding: 16px;">
<p><b>Spring Boot Related Topics</b></p>
<ol style="text-align: left;">
<li><b><a href="https://dineshonjava.com/introduction-to-spring-boot-a-spring-boot-complete-guide/">Introduction to Spring Boo</a>t</b></li>
<li><a href="https://dineshonjava.com/essentials-key-components-and-internals-of-spring-boot-framework/"><b>Essentials and Key Components of Spring Boot</b></a></li>
<li><a href="https://dineshonjava.com/spring-boot-initilizr-web-interface-and-examples/"><b>Spring Boot Initializr Web Interface</b></a></li>
<li><a href="https://dineshonjava.com/spring-boot-initilizr-with-ides-via-spring-tool-suite/"><b>Spring Boot Initializr With IDEs</b></a></li>
<li><a href="https://dineshonjava.com/spring-boot-initializr-with-spring-boot-cli/"><b>Spring Boot Initializr With Spring Boot CLI</b></a></li>
<li><a href="https://dineshonjava.com/installing-spring-boot/"><b>Installing Spring Boot</b></a></li>
<li><a href="https://dineshonjava.com/developing-your-first-spring-boot-application-hello-world/"><b>Developing your first Spring Boot application</b></a></li>
<li><a href="https://dineshonjava.com/customizing-spring-boot-auto-configuration/"><b>External Configurations for Spring Boot Applications</b></a></li>
<li><a href="https://dineshonjava.com/logging-configuration-in-spring-boot/"><b>Logging Configuration in Spring Boot</b></a></li>
<li><a href="https://dineshonjava.com/spring-boot-with-spring-mvc-application/"><b>Spring Boot and Spring MVC</b></a></li>
<li><a href="https://dineshonjava.com/working-with-sql-databases-in-spring-boot-application/"><b>Working with SQL Databases and Spring Boot</b></a></li>
<li><a href="https://dineshonjava.com/mysql-configuration-with-spring-boot/"><b>MySQL Configurations</b></a></li>
<li><a href="https://dineshonjava.com/spring-data-jpa-using-in-spring-boot-application/"><b>Spring Data JPA using Spring Boot Application</b></a></li>
<li><a href="https://dineshonjava.com/spring-boot-with-nosql-technologies/"><b>Spring Boot with NoSQL technologies</b></a></li>
<li><a href="https://dineshonjava.com/spring-cache-tutorial/"><b>Spring Cache Tutorial</b></a></li>
<li><a href="https://dineshonjava.com/spring-security-tutorial-using-spring-boot/"><b>Spring Security Tutorial with Spring Boot</b></a></li>
<li><a href="https://dineshonjava.com/spring-boot-and-mongodb-in-rest-application/"><b>Spring Boot and MongoDB in REST Application</b></a></li>
<li><b><a href="https://dineshonjava.com/spring-boot-actuator-complete-guide/">Complete Guide for Spring Boot Actuator</a></b></li>
<li><b><a href="https://dineshonjava.com/microservices-with-spring-boot/">Microservices with Spring Boot</a></b></li>
</ol>
</div>
<div style="font-size: 12pt;">Happy Spring Boot Learning!!!</div>
</div>
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