java - How to copy resources from external jar in maven?

Java - How to copy resources from external jar in maven?

Copying resources from an external JAR in a Maven project involves extracting the desired resources and placing them in the appropriate directory of your project. This can be done using Maven plugins such as the maven-dependency-plugin and the maven-resources-plugin.

Here's a step-by-step guide to achieving this:

Step-by-Step Guide

1. Add the External JAR as a Dependency

First, make sure that the external JAR is added as a dependency in your pom.xml.

<dependency> <groupId>com.example</groupId> <artifactId>external-jar</artifactId> <version>1.0.0</version> </dependency>

2. Configure the maven-dependency-plugin to Unpack the JAR

Use the maven-dependency-plugin to unpack the external JAR into a temporary directory.

<build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <version>3.1.2</version> <executions> <execution> <id>unpack</id> <phase>process-resources</phase> <goals> <goal>unpack</goal> </goals> <configuration> <artifactItems> <artifactItem> <groupId>com.example</groupId> <artifactId>external-jar</artifactId> <version>1.0.0</version> <type>jar</type> <overWrite>true</overWrite> <outputDirectory>${project.build.directory}/unpacked</outputDirectory> </artifactItem> </artifactItems> </configuration> </execution> </executions> </plugin> </plugins> </build>

3. Configure the maven-resources-plugin to Copy the Resources

Next, configure the maven-resources-plugin to copy the resources from the temporary directory to your desired location.

<build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-resources-plugin</artifactId> <version>3.1.0</version> <executions> <execution> <id>copy-resources</id> <phase>process-resources</phase> <goals> <goal>copy-resources</goal> </goals> <configuration> <outputDirectory>${project.build.outputDirectory}/path/to/destination</outputDirectory> <resources> <resource> <directory>${project.build.directory}/unpacked</directory> <includes> <include>**/*</include> </includes> </resource> </resources> </configuration> </execution> </executions> </plugin> </plugins> </build>

4. Full pom.xml Example

Here is how your pom.xml might look with the complete configuration:

<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>my-project</artifactId> <version>1.0-SNAPSHOT</version> <dependencies> <dependency> <groupId>com.example</groupId> <artifactId>external-jar</artifactId> <version>1.0.0</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <version>3.1.2</version> <executions> <execution> <id>unpack</id> <phase>process-resources</phase> <goals> <goal>unpack</goal> </goals> <configuration> <artifactItems> <artifactItem> <groupId>com.example</groupId> <artifactId>external-jar</artifactId> <version>1.0.0</version> <type>jar</type> <overWrite>true</overWrite> <outputDirectory>${project.build.directory}/unpacked</outputDirectory> </artifactItem> </artifactItems> </configuration> </execution> </executions> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-resources-plugin</artifactId> <version>3.1.0</version> <executions> <execution> <id>copy-resources</id> <phase>process-resources</phase> <goals> <goal>copy-resources</goal> </goals> <configuration> <outputDirectory>${project.build.outputDirectory}/path/to/destination</outputDirectory> <resources> <resource> <directory>${project.build.directory}/unpacked</directory> <includes> <include>**/*</include> </includes> </resource> </resources> </configuration> </execution> </executions> </plugin> </plugins> </build> </project>

With this configuration, the resources from the external JAR will be unpacked into a temporary directory and then copied to your desired location within your project during the process-resources phase.

Examples

  1. Maven copy resources from external JAR

    • Description: Demonstrates how to configure Maven to copy resources from an external JAR file into your project's build directory.
    • Code:
      <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <executions> <execution> <id>copy-dependencies</id> <phase>prepare-package</phase> <goals> <goal>copy-dependencies</goal> </goals> <configuration> <includeScope>runtime</includeScope> <outputDirectory>${project.build.directory}/dependency-jars</outputDirectory> </configuration> </execution> </executions> </plugin> </plugins> </build>

  2. Maven extract resources from external dependency

    • Description: Extracts specific resources from an external Maven dependency into your project's build directory.
    • Code:
      <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <executions> <execution> <id>unpack-dependencies</id> <phase>prepare-package</phase> <goals> <goal>unpack-dependencies</goal> </goals> <configuration> <includeArtifactIds>your-external-artifact-id</includeArtifactIds> <outputDirectory>${project.build.directory}/extracted-resources</outputDirectory> </configuration> </execution> </executions> </plugin> </plugins> </build>

  3. Maven copy resources from external JAR to target directory

    • Description: Copies resources from an external JAR file into the target directory during Maven build.
    • Code:
      <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <executions> <execution> <id>copy-resources</id> <phase>prepare-package</phase> <goals> <goal>copy-dependencies</goal> </goals> <configuration> <includeArtifactIds>your-external-artifact-id</includeArtifactIds> <outputDirectory>${project.build.directory}/copied-resources</outputDirectory> </configuration> </execution> </executions> </plugin> </plugins> </build>

  4. Maven unpack resources from external JAR

    • Description: Unpacks resources from an external JAR file into a specified directory using Maven.
    • Code:
      <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <executions> <execution> <id>unpack</id> <phase>generate-resources</phase> <goals> <goal>unpack</goal> </goals> <configuration> <artifactItems> <artifactItem> <groupId>your.group.id</groupId> <artifactId>your-artifact-id</artifactId> <version>your-version</version> <type>jar</type> <overWrite>true</overWrite> <outputDirectory>${project.build.directory}/unpacked-resources</outputDirectory> </artifactItem> </artifactItems> </configuration> </execution> </executions> </plugin> </plugins> </build>

  5. Maven include resources from external JAR in classpath

    • Description: Includes resources from an external JAR file in your project's classpath during Maven build.
    • Code:
      <dependencies> <dependency> <groupId>your.group.id</groupId> <artifactId>your-artifact-id</artifactId> <version>your-version</version> <type>jar</type> </dependency> </dependencies>

  6. Maven extract files from external dependency

    • Description: Extracts specific files from an external Maven dependency into your project's build directory.
    • Code:
      <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <executions> <execution> <id>unpack-dependency</id> <phase>generate-resources</phase> <goals> <goal>unpack</goal> </goals> <configuration> <artifactItems> <artifactItem> <groupId>your.group.id</groupId> <artifactId>your-artifact-id</artifactId> <version>your-version</version> <type>jar</type> <outputDirectory>${project.build.directory}/extracted-files</outputDirectory> </artifactItem> </artifactItems> </configuration> </execution> </executions> </plugin> </plugins> </build>

  7. Maven copy resources from external JAR to specific directory

    • Description: Copies resources from an external JAR file to a specific directory within your project structure using Maven.
    • Code:
      <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <executions> <execution> <id>copy-resources</id> <phase>prepare-package</phase> <goals> <goal>copy-dependencies</goal> </goals> <configuration> <outputDirectory>${project.build.directory}/custom-resources</outputDirectory> </configuration> </execution> </executions> </plugin> </plugins> </build>

  8. Maven include external JAR resources in build

    • Description: Includes resources from an external JAR file directly in your Maven build process.
    • Code:
      <build> <resources> <resource> <directory>${project.basedir}/src/main/resources</directory> </resource> <resource> <directory>${project.build.directory}/dependency-jars</directory> <includes> <include>*.xml</include> <include>*.properties</include> </includes> </resource> </resources> </build>

  9. Maven extract resources from external JAR file

    • Description: Extracts all resources from a specific external JAR file into a directory during Maven build.
    • Code:
      <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <executions> <execution> <id>unpack-dependencies</id> <phase>generate-resources</phase> <goals> <goal>unpack-dependencies</goal> </goals> <configuration> <outputDirectory>${project.build.directory}/unpacked-resources</outputDirectory> </configuration> </execution> </executions> </plugin> </plugins> </build>

  10. Maven extract specific file from external dependency

    • Description: Extracts a specific file from an external Maven dependency into your project's build directory.
    • Code:
      <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <executions> <execution> <id>unpack-dependency-file</id> <phase>generate-resources</phase> <goals> <goal>unpack-dependency</goal> </goals> <configuration> <artifactItems> <artifactItem> <groupId>your.group.id</groupId> <artifactId>your-artifact-id</artifactId> <version>your-version</version> <type>jar</type> <outputDirectory>${project.build.directory}/specific-file</outputDirectory> <includes>path/to/your/file.extension</includes> </artifactItem> </artifactItems> </configuration> </execution> </executions> </plugin> </plugins> </build>

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