How do I copy third-party jars to my target jar using Maven 3.6.0 - maven-3

Question

I am trying to create a executable jar with Maven where all the third-party dependency jars are in the root. Included are two pics for examples, and my pom.xml
With this pom, I am getting this result just below it where the jars are broken out into folders.
<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:// /xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.mycompany.xmlrpc</groupId>
<artifactId>gz-xmlrpc-server</artifactId>
<version>1.1.0-RELEASE</version>
<packaging>jar</packaging>
<name>gz-xmlrpc-server</name>
<url>http://maven.apache.org</url>
<properties>
<java-version>1.7</java-version>
<target-java-version>1.7</target-java-version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.maven.surefire/surefire-junit3 -->
<dependency>
<groupId>org.apache.maven.surefire</groupId>
<artifactId>surefire-junit3</artifactId>
<version>3.0.0-M3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.xmlrpc/xmlrpc-server -->
<dependency>
<groupId>org.apache.xmlrpc</groupId>
<artifactId>xmlrpc-server</artifactId>
<version>3.1.3</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.14</version>
</dependency>
<!-- mycompany -->
<dependency>
<groupId>com.mycompany.batch</groupId>
<artifactId>gz-batch-comptroller</artifactId>
<version>1.0.0-RELEASE</version>
</dependency>
</dependencies>
<build>
<sourceDirectory>src/main/java</sourceDirectory>
<resources>
<resource>
<directory>src/main/resources</directory>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-enforcer-plugin</artifactId>
<version>3.0.0-M2</version>
<executions>
<execution>
<id>enforce-maven</id>
<goals>
<goal>enforce</goal>
</goals>
<configuration>
<rules>
<requireMavenVersion>
<version>3.6.0</version>
</requireMavenVersion>
</rules>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<version>3.1.0</version>
<executions>
<execution>
<id>attach-javadocs</id>
<goals>
<goal>jar</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
<configuration>
<source>${java-version}</source>
<target>${target-java-version}</target>
<compilerArgument>-Xlint:all</compilerArgument>
<showWarnings>true</showWarnings>
<showDeprecation>true</showDeprecation>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.1.1</version>
<configuration>
<archive>
<manifest>
<addClasspath>false</addClasspath>
<Main-Class>com.mycompany.xmlrpc.server.Server</Main-Class>
</manifest>
<manifestEntries>
<Built-By>Michael Davidson</Built-By>
<Class-Path>.</Class-Path>
</manifestEntries>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.2.1</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<manifestEntries>
<Main-Class>com.mycompany.xmlrpc.server.Server</Main-Class>
<Class-Path>.</Class-Path>
</manifestEntries>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.1.1</version>
<configuration>
<archive>
<manifest>
<mainClass>com.mycompany.xmlrpc.server.Server</mainClass>
</manifest>
<manifestEntries>
<Class-Path>. gz-batch-comptroller-1.0.0-RELEASE.jar</Class-Path>
</manifestEntries>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>3.0.0-M3</version>
<configuration>
<testFailureIgnore>true</testFailureIgnore>
</configuration>
</plugin>
</plugins>
</build>
</project>
Here is what I need with the full jars included.
I see other threads on this subject, and I believe my pom is correct. But, I can't seem to get there.
Thanks.

Answer 1

I am not sure why you are using all the 3 maven plugins - jar, shade and assembly.
Could you try using either shade or assembly plugin. You could also refer (if not already) following link to check these plugin usages:
Difference between maven plugins ( assembly-plugins , jar-plugins , shaded-plugins)

Answer 2

Please remove maven-assembly-plugin and maven-jar-plugin completely from pom.xml file and then just use maven-shade-plugin as follows:
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.2.1</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
Then run mvn clean package and check generated JAR file.