使用Maven 打Jar包，运行时引用的外部Jar包报 ClassNotFoundException

我不是女神ヾ 2023-07-18 06:14 12阅读 0赞

1.放外部JAR包到项目中

![20200324174444744.png][]

2.pom.xml 配置，**注意：** **添加classpath缺少的内容，如果不添加，生成的JAR包的MANIFEST.MF文件中会缺少对应的引用。**

<build>
        <plugins>
            
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                    <compilerArguments>
                        <extdirs>${project.basedir}/src/main/resources/lib</extdirs>
                    </compilerArguments>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <configuration>
                    <archive>
                        <manifest>
                            <addClasspath>true</addClasspath>
                            <classpathPrefix>lib/</classpathPrefix>
                            <mainClass>com.cnki.jksb.KbaseDataApplication</mainClass>
                        </manifest>
                        
                        <manifestEntries>
                            <Class-Path>lib/kbase-java-1.0.jar</Class-Path>
                        </manifestEntries>
    
                    </archive>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <executions>
                    <execution>
                        <id>copy</id>
                        <phase>install</phase>
                        <goals>
                            <goal>copy-dependencies</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>${project.build.directory}/lib</outputDirectory>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

3.pom.xml 添加本地Jar包的依赖。

<dependency>
        <groupId>com.kbase</groupId>
        <artifactId>kbase-java</artifactId>
        <version>1.0</version>
        <scope>system</scope>
        <systemPath>${basedir}/src/main/resources/lib/kbase-java.jar</systemPath>
    </dependency>

4.保证生成的lib目录下有对应的Jar包，MANIFEST.MF 下也有对应Jar包的引用，应该就没问题。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0ZvcmV2ZXJMb3ZlSGViZQ_size_16_color_FFFFFF_t_70][]

[20200324174444744.png]: /images/20230528/48593158496c46f683230f917650a895.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0ZvcmV2ZXJMb3ZlSGViZQ_size_16_color_FFFFFF_t_70]: /images/20230528/6004f25f13654167bccaa44387a82b03.png