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org.apache.flink.client.program.ProgramInvocationException: The program's entry point class 'com.example.KafkaFlink' was not found in the jar file

I was getting an error ProgramInvocationException while trying upload a jar file to flink local server
Here is the pom.xml of code
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>lib/</classpathPrefix>
<mainClass>com.example.KafkaFlink</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>

Making absolute reference to a classpath in Maven

I have a customized jar that the application uses. Instead of installing jar in maven I want to make reference to it by defining absolute location for that jar in the manifest file. I am using the code shown below to update information in manifest file. However, I am not sure how can I reference to the jar location that uses absolute path like : D:/Shared_library/Test.jar . This might not be a good practice but I want to see if there is anything like that:
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>org.ad.MainClass</mainClass>
<addClasspath>true</addClasspath>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>

You can add it using <manifestEntries> tag.
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifestEntries>
<Class-Path>file:///D:/Shared_library/Test.jar</Class-Path>
</manifestEntries>
<manifest>
<mainClass>org.ad.MainClass</mainClass>
<addClasspath>true</addClasspath>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>

mvn jar file : library include failed

I did mvn package and ran my file by doing java -jar target\output.jar
All the jar libraries specified in the dependency of pom.xml are not included. Do advice what's wrong below. Thanks!
Below is my pom.xml to allow jar file generation.
<plugin>
<!-- Build an executable JAR -->
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.1.0</version>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>lib/</classpathPrefix>
<mainClass>com.workspez.psg.letrikEtara.PlanetGroupLetrikEtara</mainClass>
</manifest>
</archive>
</configuration>
</plugin>

Try and compare/complete your declaration with the ones in "Including dependencies in a jar with Maven", like adding the executions section.
Or, if this is not working, consider the maven shade plugin, whic can achieve a simlar goal.

Got it working. This was missing:
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
To the following should work:
<plugin>
<!-- Build an executable JAR -->
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.1.0</version>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>lib/</classpathPrefix>
<mainClass>com.workspez.psg.letrikEtara.PlanetGroupLetrikEtara</mainClass>
</manifest>
</archive>
</configuration>
</plugin>

Use subdirectories with classpathPrefix in maven pom.xml

I am using the following to build up a classpath in my maven pom.xml
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>lib/</classpathPrefix>
</manifest>
There is a directory under 'lib' which I also want to add to the classpath but it doesn't seem to pick it up.
Is there any way to do this?

If you want to add a directory to your Class-Path in your Manifest file, you can add something like this to your pom.xml
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<addDefaultImplementationEntries>true</addDefaultImplementationEntries>
<addClasspath>true</addClasspath>
<mainClass>your_main_class</mainClass>
</manifest>
<manifestEntries>
<Class-Path>lib/myfolder/</Class-Path>
</manifestEntries>
</archive>
</configuration>
</plugin>

You cannot do it with jar plugin. Try assembly plugin, it is more flexible

Can not set the final jar name with maven-assembly-plugin

This is how I configured maven-assembly-plugin
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.4</version>
<configuration>
<finalName>myapp</finalName>
<archive>
<manifest>
<mainClass>com.myapp.Main</mainClass>
</manifest>
</archive>
<!--
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
-->
</configuration>
</plugin>
and I expect the final jar file should be myapp.jar but it ends up with myapp-jar-with-dependencies.jar
Can you tell me how to configure to exclude "jar-with-dependencies" out of the final name?

You can specify the finalName property to give the jar the name you want, and specify that appendAssemblyId should be false to avoid the jar-with-dependencies suffix.
The configuration below will output a jar called test.jar
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.4</version>
<configuration>
<finalName>test</finalName>
<archive>
<manifest>
<mainClass>com.myapp.Main</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<appendAssemblyId>false</appendAssemblyId>
</configuration>
</plugin>