Creating two executables from a spring-boot maven project [closed]

To generate two distinct executable JARs from your Spring Boot Maven project—one for your microservice and another for the scheduler—you can organize your project as a multi-module Maven setup. This configuration allows for efficient management of shared code and dependencies while producing separate executables for each component.

Steps to Implement:

Set Up a Multi-Module Maven Project:

Parent Project (Aggregator):
- Create a parent pom.xml that defines the overall project structure and common configurations.
Microservice Module:
- Establish a module dedicated to your microservice.
- Include the necessary dependencies and the main class for the microservice.
Scheduler Module:
- Set up a separate module for the scheduler functionality.
- Include only the dependencies required for the scheduler.
- Define a main class for the scheduler application.
This modular approach ensures that each executable has its own set of dependencies and configurations, preventing unnecessary components from being included.

Configure Each Module’s pom.xml:

Microservice Module pom.xml:
- Set the packaging type to jar.
- Define the main class in the Spring Boot plugin configuration.
- List the dependencies specific to the microservice.
Scheduler Module pom.xml:
- Set the packaging type to jar.
- Define the main class in the Spring Boot plugin configuration.
- List only the dependencies required for the scheduler.
By configuring each module’s pom.xml appropriately, you ensure that the resulting JARs are self-contained and include only the necessary components.

Manage Shared Code (If Applicable):

If both modules share common code or utilities, consider creating an additional module (e.g., common) to house this shared logic.
Both the microservice and scheduler modules can then depend on this common module. This setup promotes code reuse and maintainability.

Build the Project:

In the parent project’s directory, execute mvn clean install.
Maven will build each module according to its configuration, producing separate executable JARs for the microservice and the scheduler. This command compiles the code, packages the JARs, and installs them into your local Maven repository.

Advantages of This Approach:

Separation of Concerns: Each application (microservice and scheduler) operates independently, reducing the risk of unintended interactions.
Optimized Dependencies: Each JAR includes only the libraries it requires, minimizing the footprint and potential conflicts.
Independent Deployment: You can deploy and scale the microservice and scheduler separately, providing greater flexibility in managing workloads.

To create two distinct executable JARs from your Spring Boot Maven project—one for a microservice and another for a scheduler—you can structure your project as a multi-module Maven project. This setup allows for efficient management of shared code and dependencies while producing separate executables for each component.

Project Structure:

parent-project/
├── pom.xml
├── microservice-module/
│   ├── pom.xml
│   └── src/
│       └── main/
│           ├── java/
│           │   └── com.example.microservice/
│           │       └── MicroserviceApplication.java
│           └── resources/
├── scheduler-module/
│   ├── pom.xml
│   └── src/
│       └── main/
│           ├── java/
│           │   └── com.example.scheduler/
│           │       └── SchedulerApplication.java
│           └── resources/
└── common-module/ (optional)
    ├── pom.xml
    └── src/
        └── main/
            ├── java/
            │   └── com.example.common/
            └── resources/

1. Parent 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>com.example</groupId>
    <artifactId>parent-project</artifactId>
    <version>1.0.0</version>
    <packaging>pom</packaging>

    <modules>
        <module>microservice-module</module>
        <module>scheduler-module</module>
        <!-- <module>common-module</module> -->
    </modules>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.5.4</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

2. Microservice Module 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>

    <parent>
        <groupId>com.example</groupId>
        <artifactId>parent-project</artifactId>
        <version>1.0.0</version>
    </parent>

    <artifactId>microservice-module</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- Add other microservice-specific dependencies here -->
        <!-- <dependency>
            <groupId>com.example</groupId>
            <artifactId>common-module</artifactId>
        </dependency> -->
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <mainClass>com.example.microservice.MicroserviceApplication</mainClass>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

3. Scheduler Module 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>

    <parent>
        <groupId>com.example</groupId>
        <artifactId>parent-project</artifactId>
        <version>1.0.0</version>
    </parent>

    <artifactId>scheduler-module</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <!-- Add other scheduler-specific dependencies here -->
        <!-- <dependency>
            <groupId>com.example</groupId>
            <artifactId>common-module</artifactId>
        </dependency> -->
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <mainClass>com.example.scheduler.SchedulerApplication</mainClass>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

4. Common Module pom.xml (Optional):

<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>

    <parent>
        <groupId>com.example</groupId>
        <artifactId>parent-project</artifactId>
        <version>1.0.0</version>
    </parent>

    <artifactId>common-module</artifactId>

    <dependencies>
        <!-- Define common dependencies here -->
    </dependencies>
</project>

Main Application Classes:

Microservice Application:

  package com.example.microservice;

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

  @SpringBootApplication
  public class MicroserviceApplication {
      public static void main(String[] args) {
          SpringApplication.run(MicroserviceApplication.class, args);
      }
  }

Creating two executables from a spring-boot maven project [closed]

Comments

Leave a Reply Cancel reply