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maven - Command line mvn missing dependency

问题描述

I have a simple program. From the main, I call a URL and it opens. When I run it in intellij, it works fine, but the command line doesn't work. Also, when I create another java program and import this jar, I get the same error.

This is 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>org.example</groupId>
    <artifactId>XMLConverter</artifactId>
    <version>1.0-SNAPSHOT</version>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>8</source>
                    <target>8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
            <version>20190722</version>
        </dependency>
    </dependencies>
</project>

The dependency is missing

Exception in thread "main" java.lang.NoClassDefFoundError: org/json/XML
        at xmlconverter.GetXmlData.ReadString(GetXmlData.java:50)
        at xmlconverter.GetXmlData.getJson(GetXmlData.java:24)
        at xmlconverter.XMLConverter.main(XMLConverter.java:13)
Caused by: java.lang.ClassNotFoundException: org.json.XML
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602)
        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
        ... 3 more

When I run this : mvn dependency:tree I get the right dependency.

My assumption is because I have two .java files. I have a main and then the code. It worked fine when it was all one file XMLConverter.

标签： mavenintellij-idea

解决方案

https://www.dropwizard.io/en/latest/getting-started.html#building-fat-jars

Add the following plugin also along with you maven-compiler plugin, to create the jars, mention your main class path under the mainclass tag below

<plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <version>3.1.0</version>
            <configuration>
                <createDependencyReducedPom>true</createDependencyReducedPom>
                <filters>
                    <filter>
                        <artifact>*:*</artifact>
                        <excludes>
                            <exclude>META-INF/*.SF</exclude>
                            <exclude>META-INF/*.DSA</exclude>
                            <exclude>META-INF/*.RSA</exclude>
                        </excludes>
                    </filter>
                </filters>
            </configuration>
            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                    <configuration>
                        <transformers>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                <mainClass>com.example. <Path to main class></mainClass>
                            </transformer>
                        </transformers>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins></build>

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