maven - Add external library .jar to Spring boot .jar internal /lib

Maven - Add external library .jar to Spring boot .jar internal /lib

To include an external JAR library inside a Spring Boot JAR and place it in the /lib directory, you can use the Maven maven-dependency-plugin to copy the external JAR to the desired location during the build process.

Here's a step-by-step guide:

  1. Install the External JAR to Local Repository:

    If the external JAR is not available in a Maven repository, you can install it to your local repository using the following command:

    mvn install:install-file -Dfile=path/to/external-library.jar -DgroupId=com.example -DartifactId=external-library -Dversion=1.0 -Dpackaging=jar

    Adjust the parameters according to your external library. This step is necessary to make the external JAR available in your local Maven repository.

  2. Update Your Spring Boot Project's pom.xml File:

    Add the following configuration to your pom.xml file:

    <build> <plugins> <!-- Copy the external JAR to /lib directory --> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <version>3.2.0</version> <executions> <execution> <id>copy</id> <phase>package</phase> <goals> <goal>copy-dependencies</goal> </goals> <configuration> <outputDirectory>${project.build.directory}/lib</outputDirectory> </configuration> </execution> </executions> </plugin> </plugins> </build>

    This configuration instructs the maven-dependency-plugin to copy dependencies to the /lib directory during the package phase.

  3. Build Your Spring Boot Project:

    Run the following Maven command to build your Spring Boot project:

    mvn clean package

    This command will create a Spring Boot JAR in the target directory, and the external JAR will be copied to the /lib directory inside the JAR.

  4. Run Your Spring Boot Application:

    You can run your Spring Boot application as usual, and it will automatically include the external library from the /lib directory.

Keep in mind that including external JARs inside your JAR may lead to larger JAR file sizes, and it may be more suitable to manage dependencies using a build tool or a dependency management system like Maven itself.

Examples

  1. "Maven add external JAR to Spring Boot project"

    • Code:
      <dependency> <groupId>your.groupId</groupId> <artifactId>your-artifactId</artifactId> <version>your-version</version> <scope>system</scope> <systemPath>${project.basedir}/lib/your-library.jar</systemPath> </dependency>
    • Description: Adds an external JAR to a Spring Boot project using Maven with the system scope and specifying the system path.

  2. "Maven install external JAR to local repository"

    • Code:
      mvn install:install-file -Dfile=path/to/your-library.jar -DgroupId=your.groupId -DartifactId=your-artifactId -Dversion=your-version -Dpackaging=jar
    • Description: Installs an external JAR to the local Maven repository, making it available for inclusion in a Spring Boot project.

  3. "Spring Boot Maven add external JAR to lib folder"

    • Code:
      <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-resources-plugin</artifactId> <version>3.2.0</version> <executions> <execution> <id>copy-resources</id> <phase>validate</phase> <goals> <goal>copy-resources</goal> </goals> <configuration> <outputDirectory>${project.build.directory}/lib</outputDirectory> <resources> <resource> <directory>${project.basedir}/lib</directory> </resource> </resources> </configuration> </execution> </executions> </plugin> </plugins> </build>
    • Description: Configures the Maven Resources Plugin to copy external JARs to the lib folder during the build process.

  4. "Maven add external JAR to Spring Boot fat JAR"

    • Code:
      <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <includeSystemScope>true</includeSystemScope> </configuration> </plugin> </plugins>
    • Description: Configures the Spring Boot Maven Plugin to include JARs with the system scope in the generated fat JAR.

  5. "Spring Boot Maven copy external JAR to /lib folder"

    • Code:
      <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <executions> <execution> <id>copy-dependencies</id> <phase>package</phase> <goals> <goal>copy-dependencies</goal> </goals> <configuration> <outputDirectory>${project.build.directory}/lib</outputDirectory> </configuration> </execution> </executions> </plugin> </plugins> </build>
    • Description: Uses the Maven Dependency Plugin to copy external JARs to the /lib folder during the packaging phase.

  6. "Maven external JAR not found in Spring Boot fat JAR"

    • Code:
      <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <includeSystemScope>true</includeSystemScope> </configuration> </plugin>
    • Description: Addresses issues where external JARs with the system scope are not included in the Spring Boot fat JAR.

  7. "Maven external JAR not recognized in Spring Boot project"

    • Code:
      <dependency> <groupId>your.groupId</groupId> <artifactId>your-artifactId</artifactId> <version>your-version</version> <scope>compile</scope> </dependency>
    • Description: Ensures that external JARs are recognized by the Spring Boot project by using the compile scope.

  8. "Spring Boot Maven external JAR classpath issue"

    • Code:
      <properties> <maven.compiler.source>1.8</maven.compiler.source> <maven.compiler.target>1.8</maven.compiler.target> </properties>
    • Description: Addresses classpath issues by setting the source and target Java versions in the Maven properties.

  9. "Maven external JAR not found in Spring Boot classpath"

    • Code:
      <dependency> <groupId>your.groupId</groupId> <artifactId>your-artifactId</artifactId> <version>your-version</version> <scope>runtime</scope> </dependency>
    • Description: Ensures that external JARs are included in the Spring Boot classpath by using the runtime scope.

  10. "Maven build Spring Boot project with external JAR"

    • Code:
      mvn clean install
    • Description: Builds the Spring Boot project with Maven, ensuring that the external JAR is properly included and recognized.

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