The Spring Boot Maven Plugin provides Spring Boot support in Maven, allowing you to package executable jar or war archives and run an application “in-place”. To use it you must be using Maven 3 (or better).
Note | |
---|---|
Refer to the Spring Boot Maven Plugin Site for complete plugin documentation. |
To use the Spring Boot Maven Plugin simply include the appropriate XML in the plugins
section of your 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"> <modelVersion>4.0.0</modelVersion> <!-- ... --> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <version>1.1.6.RELEASE</version> <executions> <execution> <goals> <goal>repackage</goal> </goals> </execution> </executions> </plugin> </plugins> </build> </project>
This configuration will repackage a jar or war that is built during the package
phase of
the Maven lifecycle. The following example shows both the repackaged jar, as well as the
original jar, in the target
directory:
$ mvn package $ ls target/*.jar target/myproject-1.0.0.jar target/myproject-1.0.0.jar.original
If you don’t include the <execution/>
configuration as above, you can run the plugin on
its own (but only if the package goal is used as well). For example:
$ mvn package spring-boot:repackage $ ls target/*.jar target/myproject-1.0.0.jar target/myproject-1.0.0.jar.original
If you are using a milestone or snapshot release you will also need to add appropriate
pluginRepository
elements:
<pluginRepositories> <pluginRepository> <id>spring-snapshots</id> <url>http://repo.spring.io/snapshot</url> </pluginRepository> <pluginRepository> <id>spring-milestones</id> <url>http://repo.spring.io/milestone</url> </pluginRepository> </pluginRepositories>
Once spring-boot-maven-plugin
has been included in your pom.xml
it will automatically
attempt to rewrite archives to make them executable using the spring-boot:repackage
goal. You should configure your project to build a jar or war (as appropriate) using the
usual packaging
element:
<?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"> <!-- ... --> <packaging>jar</packaging> <!-- ... --> </project>
Your existing archive will be enhanced by Spring Boot during the package
phase. The
main class that you want to launch can either be specified using a configuration option,
or by adding a Main-Class
attribute to the manifest in the usual way. If you don’t
specify a main class the plugin will search for a class with a
public static void main(String[] args)
method.
To build and run a project artifact, you can type the following:
$ mvn package $ java -jar target/mymodule-0.0.1-SNAPSHOT.jar
To build a war file that is both executable and deployable into an external container you need to mark the embedded container dependencies as “provided”, e.g:
<?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"> <!-- ... --> <packaging>war</packaging> <!-- ... --> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId> <scope>provided</scope> </dependency> <!-- ... --> </dependencies> </project>
Advanced configuration options and examples are available in the plugin info page.