java.lang.ClassNotFoundException: org.jsoup.nodes.Document using Maven

Question

I'm using maven to manage my project.

This is my main file:

package com.sample;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;

/**
 * Hello world!
 *
 */
public class App {
    public static void main(String[] args )
    {
        try
        {

        /*  String html = "<html><head><title>First parse</title></head>"
                      + "<body><p>Parsed HTML into a doc.</p></body></html>";
                    Document doc = Jsoup.parse(html);*/
            Document doc = Jsoup.connect("http://www.javatpoint.com").get();  
            String title = doc.title();  
            System.out.println("title is: " + title);  
        }
        catch (Exception e)
        {
            System.out.println(e);
        }
    }
}

This is my pom.xml:

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.sample</groupId>
    <artifactId>sample-pc</artifactId>
    <packaging>jar</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>sample-pc</name>
    <url>http://maven.apache.org</url>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.jsoup</groupId>
            <artifactId>jsoup</artifactId>
            <version>1.8.3</version>
                    <scope>compile</scope>

        </dependency>

    </dependencies>

        <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <configuration>
                    <archive>
                        <manifest>
                            <mainClass>com.sample.App</mainClass>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

When I run the following commands:

mvn clean package
java -jar target/sample-pc-1.0-SNAPSHOT.jar

I get the following errors:

Error: A JNI error has occurred, please check your installation and try again Exception in thread "main" java.lang.NoClassDefFoundError: org/jsoup/nodes/Document at java.lang.Class.getDeclaredMethods0(Native Method) at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) at java.lang.Class.privateGetMethodRecursive(Class.java:3048) at java.lang.Class.getMethod0(Class.java:3018) at java.lang.Class.getMethod(Class.java:1784) at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544) at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526) Caused by: java.lang.ClassNotFoundException: org.jsoup.nodes.Document at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.

However, if I directly run the app from eclipse, it runs without any errors. I am not sure why I cant run it from the command line.

Thanks

Avihoo Mamka Avihoo Mamka · Accepted Answer · 2015-11-10T15:30:14

Your JAR does not include your dependencies after it has been packaged.

Add this code to your pom.xml under the plugins section:

    <plugin>
        <artifactId>maven-assembly-plugin</artifactId>
        <executions>
            <execution>
                <phase>package</phase>
                <goals>
                    <goal>single</goal>
                </goals>
            </execution>
        </executions>
        <configuration>
            <descriptor>assembly.xml</descriptor>
        </configuration>
    </plugin>

And add the file assembly.xml to your resources directory:

<assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3 http://maven.apache.org/xsd/assembly-1.1.3.xsd">
    <!-- TODO: a jarjar format would be better -->
    <id>jar-with-dependencies</id>
    <formats>
        <format>jar</format>
    </formats>
    <includeBaseDirectory>false</includeBaseDirectory>
    <dependencySets>
        <dependencySet>
            <outputDirectory>/</outputDirectory>
            <useProjectArtifact>true</useProjectArtifact>
            <unpack>true</unpack>
            <scope>runtime</scope>
        </dependencySet>
    </dependencySets>
</assembly>

And then you can run mvn clean clean install or mvn package

java.lang.ClassNotFoundException: org.jsoup.nodes.Document using Maven

3 Answers