java - Spring Maven 项目 commons-logging LogFactory NoClassDefFoundError

Question

我有一个使用 Spring 运行 json Web 服务的 Maven 项目。该项目在 NetBeans 中运行良好。它被编译成 jar 文件，并且 jar 文件在 Ubuntu VM 中运行良好。但是，当我尝试在 Windows 中运行 jar 文件时，出现以下错误。

java -jar myjar.jar --server.port=8000

java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:53)
        at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
        at org.springframework.core.io.support.SpringFactoriesLoader.<clinit>(SpringFactoriesLoader.java:58)
        at org.springframework.boot.SpringApplication.getSpringFactoriesInstances(SpringApplication.java:368)
        at org.springframework.boot.SpringApplication.getSpringFactoriesInstances(SpringApplication.java:359)
        at org.springframework.boot.SpringApplication.initialize(SpringApplication.java:230)
        at org.springframework.boot.SpringApplication.<init>(SpringApplication.java:206)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:961)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:950)
        at com.baselayer.dal.core.Application.main(Application.java:20)
        ... 6 more
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        ... 14 more

我花了一整天的时间试图弄清楚这一点，但无济于事。

谁能解释一下？

这是我下面的 pom.xml。

<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>com.baselayer</groupId>
    <artifactId>dal</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>Baselayer Core DAL</name>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.2.0.RELEASE</version>
    </parent>


    <properties>
        <endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <compilerArguments>
                        <endorseddirs>${endorsed.dir}</endorseddirs>
                    </compilerArguments>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>     
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.3</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <version>2.6</version>
                <executions>
                    <execution>
                        <phase>validate</phase>
                        <goals>
                            <goal>copy</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>${endorsed.dir}</outputDirectory>
                            <silent>true</silent>
                            <artifactItems>
                                <artifactItem>
                                    <groupId>javax</groupId>
                                    <artifactId>javaee-endorsed-api</artifactId>
                                    <version>7.0</version>
                                    <type>jar</type>
                                </artifactItem>
                            </artifactItems>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
    <dependencies>        
        <dependency>
          <groupId>commons-logging</groupId>
          <artifactId>commons-logging</artifactId>
          <version>1.1.1</version>
          <scope>provided</scope>
        </dependency>      
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-redis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-cassandra</artifactId>
            <exclusions>
                <exclusion>
                    <artifactId>antlr</artifactId>
                    <groupId>org.antlr</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>metrics-core</artifactId>
                    <groupId>com.yammer.metrics</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>liquibase-core</artifactId>
                    <groupId>org.liquibase</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>com.datastax.cassandra</groupId>
            <artifactId>cassandra-driver-mapping</artifactId>
            <version>2.1.2</version>
            <type>jar</type>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-rest</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
        </dependency>
        <dependency>
                <groupId>org.codehaus.jackson</groupId>
                <artifactId>jackson-core-asl</artifactId>
                <version>1.9.2</version>
                <type>jar</type>
        </dependency>        
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-pool2</artifactId>
        </dependency>
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
        </dependency>
    </dependencies>    
</project>

Answer 1

Spring Framework 使用 Apache Commons Logging API 进行日志记录。在 Spring Boot 父 POM 中，明确排除了 Commons Logging 库。

<exclusion>
    <artifactId>commons-logging</artifactId>
    <groupId>commons-logging</groupId>
</exclusion>

这意味着您可以在运行时为 Spring 类提供选定的 Commons Logging 实现。

您可以将 commons-logging 添加到您的 POM，最新版本是 1.2，于 2014 年 7 月发布。

<dependency>
    <groupId>commons-logging</groupId>
    <artifactId>commons-logging</artifactId>
    <version>1.2</version>
</dependency>

或者您可以使用 jcl-over-slf4j.jar 将 Apache Commons Logging API 桥接到 SLF4J Api(参见 http://www.slf4j.org/legacy.html)，然后添加您选择的 SLF4L 实现。例如:

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-simple</artifactId>
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>jcl-over-slf4j</artifactId>
</dependency>