Question

我正在尝试运行一个非常简单的程序，该程序在运行时需要一个类：



import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;

public class App {

    public static void main(String[] args) {
        YAMLFactory yf =  new YAMLFactory();
    }
}

正在编译，但是我得到

Exception in thread "main" java.lang.NoClassDefFoundError: com/fasterxml/jackson/dataformat/yaml/YAMLFactory
    at App.main(App.java:6)
Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.dataformat.yaml.YAMLFactory

运行罐子。

我同时使用maven-assembly-plugin和maven-shade-plugin来添加对jar的依赖关系，它们都不对我有用。

我的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>App</groupId>
    <artifactId>App</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
            <version>20180813</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.9.8</version>
            <scope>compile</scope>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.9.8</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.8</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.dataformat/jackson-dataformat-yaml -->
        <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.dataformat/jackson-dataformat-yaml -->
        <dependency>
            <groupId>com.fasterxml.jackson.dataformat</groupId>
            <artifactId>jackson-dataformat-yaml</artifactId>
            <version>2.9.8</version>
            <scope>compile</scope>
        </dependency>



    </dependencies>
    <build>
        <pluginManagement>
            <plugins>
                <plugin>
                    <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>
                    </configuration>
                </plugin>
                <!-- Compile in Java 1.8 -->
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.6.1</version>
                    <configuration>
                        <source>1.8</source>
                        <target>1.8</target>
                    </configuration>
                </plugin>
                <plugin>
                    <!-- Build an executable JAR -->
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-jar-plugin</artifactId>
                    <version>3.1.0</version>
                    <configuration>
                        <archive>
                            <manifest>
                                <mainClass>App</mainClass>
                                <addClasspath>true</addClasspath>
                            </manifest>
                        </archive>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-shade-plugin</artifactId>
                    <version>2.3</version>
                    <executions>
                        <!-- Run shade goal on package phase -->
                        <execution>
                            <phase>package</phase>
                            <goals>
                                <goal>shade</goal>
                            </goals>
                            <configuration>
                                <transformers>
                                    <!-- add Main-Class to manifest file -->
                                    <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                        <mainClass>App</mainClass>
                                    </transformer>
                                </transformers>
                            </configuration>
                        </execution>
                    </executions>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>

</project>

Answer 1

您可以像这样配置您的Maven程序插件（您不需要其他插件）。这会将所有.class文件放入您的jar中。

mvn clean install生成jar，然后java -jar target/yourJar-jar-with-dependencies.jar执行。有关更多详细信息，请检查http://maven.apache.org/plugins/maven-assembly-plugin/

我为maven 3提供了一个改进的pom文件（实际上问题出在这个版本的maven上不可用的pluginManagement标记）。您也不需要maven jar插件。

请找到两个模式以获取详细信息

https://maven.apache.org/xsd/maven-v3_0_0.xsd

http://maven.apache.org/xsd/maven-4.0.0.xsd

<?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>App</groupId>
    <artifactId>App</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
            <version>20180813</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.9.8</version>
            <scope>compile</scope>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.9.8</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.8</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.dataformat/jackson-dataformat-yaml -->
        <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.dataformat/jackson-dataformat-yaml -->
        <dependency>
            <groupId>com.fasterxml.jackson.dataformat</groupId>
            <artifactId>jackson-dataformat-yaml</artifactId>
            <version>2.9.8</version>
            <scope>compile</scope>
        </dependency>



    </dependencies>
    <build>
            <plugins>
                <plugin>
                    <artifactId>maven-assembly-plugin</artifactId>
                    <version>3.1.0</version>
                    <configuration>
                        <finalName>your-jar-1.0</finalName>
                        <archive>
                            <manifest>
                                <addClasspath>true</addClasspath>
                                <mainClass>App</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>
                <!-- Compile in Java 1.8 -->
                <!--<plugin>-->
                    <!--&lt;!&ndash; Build an executable JAR &ndash;&gt;-->
                    <!--<groupId>org.apache.maven.plugins</groupId>-->
                    <!--<artifactId>maven-jar-plugin</artifactId>       -->
                    <!--<version>3.1.0</version>-->
                    <!--<configuration>-->
                        <!--<archive>-->
                            <!--<manifest>-->
                                <!--<mainClass>App</mainClass>-->
                                <!--<addClasspath>true</addClasspath>-->
                            <!--</manifest>-->
                        <!--</archive>-->
                    <!--</configuration>-->
                <!--</plugin>-->
            </plugins>
    </build>

</project>

UberJar不起作用：杰克逊YAML的Intellij Maven java.lang.NoClassDefFoundError

1 个答案: