java - 将 slf4j 与 maven 集成

Question

大家好，我是 Maven 的新手，我正在尝试将 slf4j 集成到 Maven 项目中这是我的 pom.xml 文件

<dependency>
 <groupId>org.slf4j</groupId>
 <artifactId>slf4j-api</artifactId>
 <version>1.7.9</version>
</dependency>

我的主函数中有这两行

Logger logger = LoggerFactory.getLogger(App.class);
logger.info("Hello World");

项目编译打包成功，但是当我尝试运行它时通过
java -cp target/maven-1.0-SNAPSHOT.jar com.goutam.maven.App抛出以下异常

Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory
    at com.goutam.maven.App.main(App.java:11)
Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)

Answer 1

build fat jar with maven

将此添加到您的 pom.xml

<build>
  <plugins>
  <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-assembly-plugin</artifactId>
        <version>2.5.3</version>
        <configuration>
            <descriptorRefs>
                <descriptorRef>jar-with-dependencies</descriptorRef>
            </descriptorRefs>

        </configuration>
        <executions>
            <execution>
                <id>assemble-all</id>
                <phase>package</phase>
                <goals>
                    <goal>single</goal>
                </goals>
            </execution>
        </executions>
    </plugin>
    </plugins>
    </build>

然后运行

java -cp target/maven-jar-with-dependencies-1.0-SNAPSHOT.jar com.goutam.maven.App

注意:选择具有 jar-with-dependencies

的 jar 文件