java – Log4JLogger的根本原因是找不到还是不可用？

发布时间：2020-12-14 05:15:40 所属栏目：Java 来源：网络整理

导读：我在类路径中有commons-logging.jar(v1.0.4)和log4j-1.2.8.jar,并获得以下运行时错误： Caused by: org.apache.commons.logging.LogConfigurationException: User-specified log class 'org.apache.commons.logging.impl.Log4JLogger' cannot be found or is

我在类路径中有commons-logging.jar(v1.0.4)和log4j-1.2.8.jar,并获得以下运行时错误：

Caused by: org.apache.commons.logging.LogConfigurationException: User-specified log class 'org.apache.commons.logging.impl.Log4JLogger' cannot be found or is not useable.
    at org.apache.commons.logging.impl.LogFactoryImpl.discoverLogImplementation(LogFactoryImpl.java:874)
    at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:604)
    at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:336)
    at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:310)
    at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:685)

解决方法

如果使用Maven,则必须确保在pom.xml中声明commons-logging和log4j

<dependencies>
    <dependency>
        <groupId>commons-logging</groupId>
        <artifactId>commons-logging</artifactId>
        <version>1.1.3</version>
    </dependency>
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
    </dependency>
</dependencies>

如果您声明只有commons-logging您获得错误Log4JLogger找不到或不可用

（编辑：李大同）

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