如何从spring boot项目创建jar，我们要在另一个spring boot应用中使用的jar？

Question

We are planning to create one spring boot project , which we create as jar file , and this jar we will use as dependency for another spring boot application , point is the first jar must contains the classes we code and its related jar files , is it possible like that ?can any one help us please .

Problem is when i create the jar , only my classes which i coded are packing into jar , not the dependencies of that app

Answer 1

Just use spring-boot-maven-plugin or spring-boot-gradle-plugin depending on your build system. Purpose of these plugins is exactly your use case.

Spring Guides are great place to start exploring: Maven Guide , Gradle Guide .

The only caveat is that you want to exclude tomcat internal container from such shared library:

Maven:

<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>

Gradle:

dependencies {
    compile("org.springframework.boot:spring-boot-starter-web")
    providedRuntime("org.springframework.boot:spring-boot-starter-tomcat")
    ...
}

Answer 2

You can do that by using "maven shade" plugin for creating a Fat jar, also called uber-jar of the parent project, which you want to use in child project. This Fat jar contains the code you have written along with all the dependencies of the project. You can check here for more details : https://maven.apache.org/plugins/maven-shade-plugin/index.html . The Fat jar created will be placed in your local repository.

In your child project, you can use parent project as a dependency by specifying following properties:

<dependency>
  <groupId>parent_project_group_id</groupId>
  <artifactId>parent_project_artifact_id</artifactId>
  <version>parent_project_version</version>
<dependency>

Make sure that you build parent project with maven shade plugin and not with spring boot default plugin. Also, use "clean install" as goal while building the parent project.