java.lang.NoClassDefFoundError POI Workbook

Question

when i try to launch JAR file im getting this exception, I've changed poi version about 4 times to try different versions but still JAR doesn't want to launch. It's a test program because in other I couldn't launch JAR and I don't want to break anything in there.

I'm using JDK 17 and also tested it with JDK 13.

App: package com;

import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class Main {

    public static void main(String[] args) {

        int x = 7;
        System.out.println(x);

        XSSFWorkbook workbook = new XSSFWorkbook();

    }

}

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.JAR</groupId>
    <artifactId>probaJar</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
    </properties>

    <dependencies>

        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.17</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.17</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml-schemas -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml-schemas</artifactId>
            <version>3.17</version>
        </dependency>



    </dependencies>

    <build>
    <plugins>

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-assembly-plugin</artifactId>
            <version>3.3.0</version>
            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>single</goal>
                    </goals>
                    <configuration>
                        <archive>
                            <manifest>
                                <mainClass>
                                    com.Main
                                </mainClass>
                            </manifest>
                        </archive>
                        <descriptorRefs>
                            <descriptorRef>jar-with-dependencies</descriptorRef>
                        </descriptorRefs>
                    </configuration>
                </execution>
            </executions>
        </plugin>

        <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-jar-plugin</artifactId>
        <version>2.4</version>
        <configuration>
            <archive>
                <!-- Configures the content of the created manifest -->
                <manifest>
                    <!-- Adds the classpath to the created manifest -->
                    <addClasspath>true</addClasspath>
                    <!-- Specifies that all dependencies of our application are found -->
                    <!-- Configures the main class of the application -->
                    <mainClass>com.Main</mainClass>
                </manifest>
            </archive>
        </configuration>
        </plugin>

    </plugins>


    </build>

</project>

Answer 1

Reason why error like this occurs on stack overfrow

Maybe you're trying to launch wrong jar file. There are two jar files created after compilation and packaging (full names omitted):

1. *.jar
2. *-jar-with-dependencies.jar

You must launch second one, because first one does not contain needed dependency classes.