[FIXED] Jar files doesn't do anything and bat file can find the main class

Issue

I have a java program I've just followed a tutorial and the .jar was created with Maven in Apache Netbeans 11. But the .jar doesn't execute... nothing happens. I even have a .bat file to run it but it says:Windows can't find file NewMain which is the main class.

This is the maven I've used:

<?xml version="1.0" encoding="UTF-8"?>
<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.mycompany</groupId>
    <artifactId>mavenproject3</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties> 
    <dependencies>
    <dependency> <groupId>com.apple</groupId> <artifactId>AppleJavaExtensions</artifactId> <version>1.4</version> </dependency>
    </dependencies>
       <build>
        <finalName>mavenproject3</finalName>
        <plugins>        
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-eclipse-plugin</artifactId>
                <version>2.9</version>
                <configuration>
                    <downloadSources>true</downloadSources>
                    <downloadJavadocs>false</downloadJavadocs>
                </configuration>
            </plugin>           
            <plugin>
                <groupId>com.mycompany</groupId>
                <artifactId>mavenproject3</artifactId>
                <version>1.0-SNAPSHOT</version>
                <configuration>
//Versión de JDK con la cual se ha construido el proyecto
// 1.8 significa que se utilizó Java8
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>    
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-eclipse-plugin</artifactId>
                <version>2.9</version>
                <configuration>
                    <downloadSources>true</downloadSources>
                    <downloadJavadocs>false</downloadJavadocs>
                </configuration>
            </plugin>    
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-assembly-plugin</artifactId>
                <version>2.4.1</version>
                <configuration>            
                    <descriptorRefs>
//Sufijo que se le agregara al fichero JAR ejecutable
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>           
                    <archive>
                        <manifest>
//Aqui se establece el nombre de la clase principal
                            <mainClass>com.MainClass</mainClass>
                        </manifest>
                    </archive>
                </configuration>
                <executions>
                    <execution>
                        <id>make-assembly</id>
                        <phase>package</phase> 
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

Is there something missing or something misplaced?

Manifest.mf

Manifest-Version: 1.0
Archiver-Version: Plexus Archiver
Built-By: Usuario
Created-By: Apache Maven 3.3.9
Build-Jdk: 1.8.0_231
Main-Class: MainClass

MainClass is not the main class

Update:
I've made the change

Manifest-Version: 1.0
Archiver-Version: Plexus Archiver
Built-By: Usuario
Created-By: Apache Maven 3.3.9
Build-Jdk: 1.8.0_231
Main-Class: NewMain

Now: NewMain parent class not found or loaded

Solution

Jar file should have Main-Class: name of the class containing the main (with package name) parameter defined in Manifest.mf.

Answered By - Rahul Chauhan
Answer Checked By - David Marino (JavaFixing Volunteer)