运行 Jar(Maven 项目)后我得到以下信息:
java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory
错误是在变量的声明中引起的:
private static final Logger logger = LoggerFactory.getLogger("name.log");
这个错误是因为我需要在项目的classPath中添加一个slf4j的实现(这是我搜索了好几个小时才明白的)
我在网上阅读的解决方案建议向 Pom 添加一个依赖项，它应该可以解决它。好吧，出于某种原因，它对我不起作用。
因为是Maven项目，所以我的pom.xml是这样的:
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.13</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>1.7.13</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.13</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.1.3</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
<version>1.1.3</version>
</dependency>
可能相关:当我在 Netbeans (IDE) 中运行该项目时，它完美地记录；但是一旦我构建并尝试运行 jar，它就会抛出上面提到的异常。
感谢您的帮助。
最佳答案
与此问题无关，但只保留一个slf4实现，e.g. slf4j-简单。
现在关于丢失的 LoggerFactory。在应用程序服务器外部运行时，必须通过显式类路径或通过将所需的 jar 存档嵌入生成的 jar(fatjar)来提供库。
对于前一个选项，可以在命令行或使用 jar list 完成。
下面是一个 pom，显示了 list 的使用和 fatjar 的生成:
- 没有打包，使用maven类路径:
mvn clean compile antrun:run -Pclass-antrun
- 在 list 中使用类路径打包:
mvn clean package antrun:run -Pjar-antrun
- 打包一个 fatjar:
mvn clean package antrun:run -Pfatjar
<?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>dummy-slf4j</groupId>
<artifactId>dummy-slf4j</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<main.class>dummy.App</main.class>
<jdk.version>1.6</jdk.version>
<project.encoding>UTF-8</project.encoding>
<project.build.sourceEncoding>${project.encoding}</project.build.sourceEncoding>
<project.reporting.outputEncoding>${project.encoding}</project.reporting.outputEncoding>
<maven.compiler.source>${jdk.version}</maven.compiler.source>
<maven.compiler.target>${jdk.version}</maven.compiler.target>
<maven.compiler.compilerVersion>${jdk.version}</maven.compiler.compilerVersion>
<maven.compiler.fork>true</maven.compiler.fork>
<maven.compiler.verbose>true</maven.compiler.verbose>
<maven.compiler.optimize>true</maven.compiler.optimize>
<maven.compiler.debug>true</maven.compiler.debug>
<maven.jar.plugin.version>2.6</maven.jar.plugin.version>
<maven.assembly.plugin.version>2.6</maven.assembly.plugin.version>
<maven.dependency.plugin.version>2.10</maven.dependency.plugin.version>
<maven.antrun.plugin.version>1.8</maven.antrun.plugin.version>
</properties>
<dependencies>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>1.7.13</version>
</dependency>
</dependencies>
<build>
<pluginManagement>
<plugins>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>${maven.jar.plugin.version}</version>
<configuration>
<archive>
<manifest>
<mainClass>${main.class}</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<artifactId>maven-antrun-plugin</artifactId>
<version>${maven.antrun.plugin.version}</version>
</plugin>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>${maven.assembly.plugin.version}</version>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<archive>
<manifest>
<mainClass>${main.class}</mainClass>
</manifest>
</archive>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-dependency-plugin</artifactId>
<version>${maven.dependency.plugin.version}</version>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<includeScope>runtime</includeScope>
<outputDirectory>${project.build.directory}/lib/</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</pluginManagement>
</build>
<profiles>
<profile>
<id>jar-antrun</id>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>lib/</classpathPrefix>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-antrun-plugin</artifactId>
<configuration>
<target>
<java fork="true"
jar="${project.build.directory}/${project.build.finalName}.jar" />
</target>
</configuration>
</plugin>
</plugins>
</build>
</profile>
<profile>
<id>class-antrun</id>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-antrun-plugin</artifactId>
<configuration>
<target>
<java fork="true" classname="${main.class}">
<classpath refid="maven.compile.classpath" />
</java>
</target>
</configuration>
</plugin>
</plugins>
</build>
</profile>
<profile>
<id>fatjar</id>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-antrun-plugin</artifactId>
<configuration>
<target>
<java fork="true"
jar="${project.build.directory}/${project.build.finalName}-jar-with-dependencies.jar" />
</target>
</configuration>
</plugin>
</plugins>
</build>
</profile>
</profiles>
</project>
使用主应用程序:
package dummy;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class App {
private static final Logger logger = LoggerFactory.getLogger(App.class);
public static void main(String[] args) {
logger.info("toto");
}
}
更新:添加一个 fatjar 的配置文件
关于maven - 登录 Maven java.lang.NoClassDefFoundError : org/slf4j/LoggerFactory，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34803189/