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Maven java: package does not exist

I am making a discord bot in java with JDA and I wanted to try to host it. I found out the best way to build an IntelliJ project is with maven. If I run mvn install i get the following error.
> java: package net.dv8tion.jda.api does not exist
I searched stack overflow and think I need to add a dependency but because this is my first time using java I really can't find out how to implement it in my project. Can anyone tell me how to fix the problem and how to implement it?
Here is my pom file.
<?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>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<groupId>bananaaction</groupId>
<artifactId>DiscordBot</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>net.dv8tion</groupId>
<artifactId>JDA</artifactId>
<version>4.2.0_222</version>
</dependency>
</dependencies>
<repositories>
<repository>
<id>jcenter</id>
<name>jcenter-bintray</name>
<url>https://jcenter.bintray.com</url>
</repository>
</repositories>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId> <!-- In Red -->
<configuration>
<archive>
<manifest>
<mainClass>com.bananaaction.Main</mainClass>
</manifest>
</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>
</plugins>
</build>
</project>

As you guessed, the problem is that you didn't include JDA as a dependency (library).
In order to do this, add this to the pom.xml:
<dependencies>
<dependency>
<groupId>net.dv8tion</groupId>
<artifactId>JDA</artifactId>
<version>4.2.0_222</version>
</dependency>
</dependencies>
<repositories>
<repository>
<id>jcenter</id>
<name>jcenter-bintray</name>
<url>https://jcenter.bintray.com</url>
</repository>
</repositories>
See the README of JDA for details.
The first section (<dependencies>) declares your dependencies (libraries).
Here, you add a dependency with the group id net.dv8tion and artifact id JDA with version 4.2.0_222 (the latest version at the time of writing this (may 2nd, 2020).
The second section (<repositories>) defines where to look for. JDA is not in the maven central (the default) repository but in the jcenter repository so you need to add the jcenter repository to your pom.xml.
If you package it to a JAR, dependencies will not be included. In order to do this, you can use the maven-assembly-plugin, for example.
You can add the plugin to the pom.xml wth the following code in the <plugins> secion:
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>yourPackage.yourClass</mainClass>
</manifest>
</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>
Integrated in your pom.xml, it could look like this:
<?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>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<groupId>com.bananaaction</groupId>
<artifactId>IdeaProjects</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>net.dv8tion</groupId>
<artifactId>JDA</artifactId>
<version>4.2.0_222</version>
</dependency>
</dependencies>
<repositories>
<repository>
<id>jcenter</id>
<name>jcenter-bintray</name>
<url>https://jcenter.bintray.com</url>
</repository>
</repositories>
<build>
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>yourPackage.yourClass</mainClass>
</manifest>
</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>
</plugins>
</build>
</project>
Don't forget to change the main class, however.

Error: Could not find or load main class. Running maven jar-with-dependencies

I am using Maven to manage a personal project and am getting this maven error whenever I try to run my jar with dependencies.
$ java -jar .\SpotifyAutomation-1.0-SNAPSHOT-jar-with-dependencies.jar
Error: Could not find or load main class SpotifyRunner
(I do a clean and install before running).
My pom file looks like this:
<?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>SpotifyAutomation</groupId>
<artifactId>SpotifyAutomation</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<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>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>lib</classpathPrefix>
<mainClass>SpotifyRunner</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-server</artifactId>
<version>3.4.0</version>
</dependency>
<dependency>
<groupId>se.michaelthelin.spotify</groupId>
<artifactId>spotify-web-api-java</artifactId>
<version>1.5.0</version>
</dependency>
</dependencies>
Any insight on how I might go about fixing this? I have tried switching around my classpathPrefix but to no avail. My project has one module and one package.
My project structure is shown in the below image:
Project Structure

Java Maven Clean and Build With Dependencies

im still new in java maven and dependencies. can i ask?
I create some project about QR code Generator with using Java Maven.
When I run my project into Netbeans, using qrgen-1.2.jar, core-2.0.jar and javase-2.0.jar. IT CAN GENERATE ANY QR CODE THAT I WANT.
But when i try to Build and Clean, it CANNOT generate my QR code in my Document/NetbeansProjects/QRcode/target/QRcode-1.0-SNAPSHOT.JR
Here my pom.xml
<?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>QRcode</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>com.mycompany.qrcode.QRcode</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
<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>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>net.glxn</groupId>
<artifactId>qrgen</artifactId>
<version>1.2</version>
</dependency>
</dependencies>

Based on your POM, you aren't packaging your dependencies in the executable jar being generated. This is causing your program to fail when you run it outside of the IDE.
Here's an example of how to use the Maven Assembly plugin to create an executable jar that includes your dependencies:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
<configuration>
<archive>
<manifest>
<mainClass>com.mycompany.qrcode.QRcode</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</execution>
</executions>
</plugin>
The output of mvn package will now include target/QRcode-1.0-SNAPSHOT-jar-with-dependencies.jar, which you can see includes the classes specified by your build dependencies.
Here's a link to the documentation for the plugin.

Maven build does not compile

I am trying to compile a maven project but I get the following error:
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.6.0:java (default-cli) on project storm-example: The parameters 'mainClass' for goal org.codehaus.mojo:exec-maven-plugin:1.6.0:java are missing or invalid -> [Help 1]
I am new to maven projects actually. The thing is I am not using the codehous.mojo plugin at all. From what I saw from different existing issues, the people who got this were using the mojo plugin in the build, but in my case i just need the maven-assembly-plugin. Do I need mojo in every maven object despite not explicitly needing it?
The following is my maven pom.xml file
<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.learningstorm</groupId>
<artifactId>storm-example</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>storm-example</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.storm</groupId>
<artifactId>storm-core</artifactId>
<version>1.0.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
<repositories>
<repository>
<id>clojars.org</id>
<url>http://clojars.org/repo</url>
</repository>
</repositories>
<build>
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.0.0</version>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<archive>
<manifest>
<mainClass />
</manifest>
</archive>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>

The error is a complaint about your following tag in the maven-assembly-plugin's configuration :
<archive>
<manifest>
<mainClass />
</manifest>
</archive>
Unless you want to create an executable jar (in which case you should specify the qualified name of the "main" class), you should just remove the whole <archive> tag.
It looks like you've based your work around the "Creating an Executable JAR"
example of the maven-assembly-plugin's usage page while you might only need what is defined in the first basic example.

Why are the dependencies not included in the JAR file? [duplicate]

This question already has answers here:
Including dependencies in a jar with Maven
(16 answers)
Closed 8 years ago.
If I look inside the JAR file there are no dependencies in it.
I am using Netbeans 8.0 as IDE and the JDK 8 Update 25.
This is my pom.xml file:
<?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>XmppMinimalClient</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
</properties>
<build>
<plugins>
<plugin>
<!-- Build an executable JAR -->
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
<configuration>
<archive>
<manifest>
<mainClass>com.mycompany.xmppminimalclient.XmppMinimalClient</mainClass>
<addClasspath>true</addClasspath>
<addDefaultImplementationEntries>true</addDefaultImplementationEntries>
<addDefaultSpecificationEntries>true</addDefaultSpecificationEntries>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-assembly</id> <!-- this is used for inheritance merges -->
<phase>package</phase> <!-- bind to the packaging phase -->
</execution>
</executions>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.igniterealtime.smack</groupId>
<artifactId>smack-core</artifactId>
<version>4.0.5</version>
</dependency>
<dependency>
<groupId>org.igniterealtime.smack</groupId>
<artifactId>smack-tcp</artifactId>
<version>4.0.5</version>
</dependency>
</dependencies>
</project>

You need to explicitly say you want to do that to Maven.
http://maven.apache.org/plugins/maven-assembly-plugin/descriptor-refs.html#jar-with-dependencies
Also:
Including dependencies in a jar with Maven