How to run Spring Boot .jar with Java Modules?

Question

I'm trying to create a simple Spring Boot application and run it with Java Modules on the latest Java version.

I have created a Main class:

package org.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Main {

  public static void main(final String[] args) {
    System.out.println("Module: " + Main.class.getModule());
    SpringApplication.run(Main.class, args);
  }
}

And a module-info.java:

module spring.jpms {
  requires spring.core;
  requires spring.boot;
  requires spring.boot.autoconfigure;
  requires spring.context;
  requires spring.beans;

  opens org.example to
      spring.core,
      spring.beans,
      spring.context;
}

When I run the Main class using an IDE generated command with module path, it works fine, the name of my application module printed out.

Module: module spring.jpms
...

When I run my application using mvn spring-boot:run or java -jar <target>.jar, the application is executed in the class-path mode. The module name is "unnamed":

...
Module: unnamed module @7923f745
...

I would like to know if there is a way to run a .jar file built by the Spring Boot Maven plugin with Java Modules, that is so the .jar files are loaded via module-path

See the complete example here: https://github.com/agavrilov76/spring-jpms

Note -jar <file> will always put the JAR file on the class-path. If it's a modular JAR file, and Spring can handle being on the module-path, then use --module <main-module>/<main-class>. The short name for --module is -m. The /<main-class> can be omitted if the module has been configured with a main class (e.g., when creating the JAR file, the --main-class option was specified). — Slaw
– Slaw, Commented May 30, 2023 at 9:05

Naman · Accepted Answer · 2024-06-04 13:40:18Z

2

Just as an update, I can confirm that it is now possible with spring-boot-starter-parent:3.3.0 to execute the application with only a command such as:

mvn spring-boot:run

Alternatively, one can at the same time create an executable using:

 mvn clean package

and execute as(sample) :

java -jar target/jpms-spring-0.0.1-SNAPSHOT.jar

Here is a reference: https://github.com/namannigam/jpms-spring

edited Jun 4, 2024 at 13:40

answered Jun 4, 2024 at 13:34

Naman

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