How to Put All Required Jar Files in a Library Folder Inside the Final Jar File with Maven

How do I put all required JAR files in a library folder inside the final JAR file with Maven?

following this link:

How To: Eclipse Maven install build jar with dependencies

i found out that this is not workable solution because the class loader doesn't load jars from within jars, so i think that i will unpack the dependencies inside the jar.

How to put all required jars in a lib folder inside the final jar with Maven without provided jars?

Add <excludeScope>provided</excludeScope> under <overWriteIfNewer>true</overWriteIfNewer>

How to add local jar files to a Maven project?

Install the JAR into your local Maven repository (typically .m2 in your home folder) as follows:

mvn install:install-file \
   -Dfile=<path-to-file> \
   -DgroupId=<group-id> \
   -DartifactId=<artifact-id> \
   -Dversion=<version> \
   -Dpackaging=<packaging> \
   -DgeneratePom=true

Where each refers to:

<path-to-file>: the path to the file to load e.g → c:\kaptcha-2.3.jar

<group-id>: the group that the file should be registered under e.g → com.google.code

<artifact-id>: the artifact name for the file e.g → kaptcha

<version>: the version of the file e.g → 2.3

<packaging>: the packaging of the file e.g. → jar

Reference

• Maven FAQ: I have a jar that I want to put into my local repository. How can I copy it in?
• Maven Install Plugin Usage: The install:install-file goal

How can I put all dependencies into one folder inside a JAR file with Maven?

No.

The structure of the JAR needs to follow the names of the packages.

How to add Maven dependency jar file from the lib folder

Have a look at system dependencies.

You basically need to define <scope>system</scope>.

<project>
    ...
    <dependencies>
      <dependency>
        <groupId>javax.sql</groupId>
        <artifactId>jdbc-stdext</artifactId>
        <version>2.0</version>
        <scope>system</scope>
        <systemPath>${java.home}/lib/rt.jar</systemPath>
      </dependency>
    </dependencies>
    ...
</project>

This is if you don't have your own hosted artifact repository server such as Nexus, Artifactory or Archiva.

If you do, then as Karl-Heinz suggested, you would be better off placing it there, as it's not good practice to commit binary artifacts to version control.

How to have a final jar with the dependency inside that jar in the jar format?

To make a fat jar that includes all you jar files, add the following code to your pom.xml. When you clean and build the project this will automatically make a fat jar file. You need to give your main class inside <mainClass> tag. That's it.

<project>
      <build>
          <plugins>
              <plugin>
                  <artifactId>maven-assembly-plugin</artifactId>
                  <configuration>
                      <archive>
                          <manifest>
                              <addClasspath>true</addClasspath>
                              <mainClass>your.main.class</mainClass>
                          </manifest>
                      </archive>
                      <descriptorRefs>
                          <descriptorRef>jar-with-dependencies</descriptorRef>
                      </descriptorRefs>
                  </configuration>
                  <executions>
                      <execution>
                          <id>final-jar-with-dependencies</id>
                          <phase>package</phase>
                          <goals>
                              <goal>single</goal>
                          </goals>
                      </execution>
                  </executions>
              </plugin>
          </plugins>
      </build>
    </project>

Including dependencies in a jar with Maven

You can do this using the maven-assembly plugin with the "jar-with-dependencies" descriptor. Here's the relevant chunk from one of our pom.xml's that does this:

  <build>
    <plugins>
      <!-- any other plugins -->
      <plugin>
        <artifactId>maven-assembly-plugin</artifactId>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>single</goal>
            </goals>
          </execution>
        </executions>
        <configuration>
          <descriptorRefs>
            <descriptorRef>jar-with-dependencies</descriptorRef>
          </descriptorRefs>
        </configuration>
      </plugin>
    </plugins>
  </build>

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