Spring
boot maven plugin is used to generate an UBER jar (by combining all the
dependent jars)
Step 1:
Add
spring-boot-maven-plugin to pom.xml.
<build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <executions> <execution> <goals> <goal>repackage</goal> </goals> </execution> </executions> </plugin> </plugins> </build>
Step 2:
Add below statement
to pom.xml. This statement tells that I would like to export this application
as jar file.
<packaging>jar</packaging>
If you
want to export the application as war file mention below statement.
<packaging>war</packaging>
Step 3:
Go to the directory
where pom.xml is located and execute below commmand to generate UBER jar file.
mvn
package
Find the
below working application.
HomeController.java
package com.sample.app.controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @RestController public class HomeController { @RequestMapping("/") public String homePage() { return "Welcome to Spring boot Application Development"; } }
App.java
package com.sample.app; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class App { public static void main(String[] args) { SpringApplication.run(App.class, args); } }
pom.xml
<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>springbootMisc</groupId> <artifactId>springbootMisc</artifactId> <version>1</version> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.6.RELEASE</version> </parent> <packaging>jar</packaging> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <executions> <execution> <goals> <goal>repackage</goal> </goals> </execution> </executions> </plugin> </plugins> </build> </project>
Total
project structure looks like below.
Generate
UBER jar file
Right
click on project.
Run As -> Run Configurations…
Mention
‘package’ in goals section and click on Run button.
It
generates a jar file in project target directory.
$ls *jar
springbootMisc-1.jar
Run the
jar file by executing the command ‘java -jar {jarFile}’
$java -jar springbootMisc-1.jar . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.1.6.RELEASE) 2019-07-19 09:03:53.610 INFO 40838 --- [ main] com.sample.app.App : Starting App v1 on C02X902SJGH5 with PID 40838 (/Users/harikrishnagurram/Documents/EclipseWorkSpaces/Learnings/springbootMisc/target/springbootMisc-1.jar started by harikrishnagurram in /Users/harikrishnagurram/Documents/EclipseWorkSpaces/Learnings/springbootMisc/target) 2019-07-19 09:03:53.613 INFO 40838 --- [ main] com.sample.app.App : No active profile set, falling back to default profiles: default 2019-07-19 09:03:54.543 INFO 40838 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http) 2019-07-19 09:03:54.581 INFO 40838 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat] 2019-07-19 09:03:54.581 INFO 40838 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.21] 2019-07-19 09:03:54.695 INFO 40838 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2019-07-19 09:03:54.695 INFO 40838 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1042 ms 2019-07-19 09:03:54.914 INFO 40838 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor' 2019-07-19 09:03:55.117 INFO 40838 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path '' 2019-07-19 09:03:55.121 INFO 40838 --- [ main] com.sample.app.App : Started App in 1.925 seconds (JVM running for 2.346)
Open the url ‘http://localhost:8080/’ in browser, you can see below screen.
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