Java 获取异常 org.apache.logging.slf4j.SLF4JLoggerContext 无法转换为 org.apache.logging.log4j.core.LoggerContext
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Getting Exception org.apache.logging.slf4j.SLF4JLoggerContext cannot be cast to org.apache.logging.log4j.core.LoggerContext
提问by user3334466
My code is very simple using apache-log4j-2.0.2:
我的代码使用 apache-log4j-2.0.2 非常简单：
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Logger;
public class Log4jtest {
static Logger log =Logger.getLogger(Log4jtest.class);
public static void main(String[] args) {
BasicConfigurator.configure();
log.debug("This is debug message");
}
}
But I'm getting exception like:
但我收到了如下异常：
Exception in thread "main" java.lang.ExceptionInInitializerError
Caused by: java.lang.ClassCastException: org.apache.logging.slf4j.SLF4JLoggerContext cannot be cast to org.apache.logging.log4j.core.LoggerContext``
at org.apache.log4j.Logger.getLogger(Logger.java:41)
at Log4jtest.<clinit>(Log4jtest.java:11)
Why is the exception coming from a simple program?
为什么异常来自一个简单的程序？
回答by TheCodingFrog
Remove below jar's from class path and it should fix the issue -
从类路径中删除下面的 jar，它应该可以解决问题 -
log4j-to-slf4j-2.0.2.jar
log4j-to-slf4j-2.0.2-sources.jar
log4j-slf4j-impl-2.0.2.jar
log4j-slf4j-impl-2.0.2-sources.jar
I was able to replicate and fix the issue after downloading apache-log4j-2.0.2 from http://www.apache.org/dyn/closer.cgi/logging/log4j/2.0.2/apache-log4j-2.0.2-bin.zip.
从http://www.apache.org/dyn/closer.cgi/logging/log4j/2.0.2/apache-log4j-2.0.2下载 apache-log4j-2.0.2 后，我能够复制并解决问题 -bin.zip。
回答by Hau
I was using Maven. I found that declaring my log4j/slf4jdependencies at the top of the <dependencies>list (before Spring Boot, which used logback) fixed the issue.
我正在使用 Maven。我发现在列表顶部声明我的log4j/slf4j依赖项<dependencies>（在 Spring Boot 之前，使用logback）解决了这个问题。
To @TheCodingFrog's credit, adding exclusions to my Spring Boot dependencies also solved the problem. Like so:
对于@TheCodingFrog 的功劳，将排除项添加到我的 Spring Boot 依赖项也解决了这个问题。像这样：
<dependencies>
<dependency>
<groupId>...</groupId>
<artifactId>...</artifactId>
<exclusions>
<exclusion>
<groupId>log4j</groupId>
<artifactId>*</artifactId>
</exclusion>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>*</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>*</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
NOTE: If you care about which logging framework is actually used, one perhaps important difference is that with @TheCodingFrog's method, slf4jretained logbackas the binding:
注意：如果您关心实际使用哪个日志记录框架，一个可能重要的区别是使用@TheCodingFrog 的方法，slf4j保留logback为绑定：
SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]
whereas, with the method I used, slf4j/log4jwas used:
而使用我使用的方法，slf4j/log4j被使用：
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
In case anyone's interested, the log4j/slf4jdependencies I used are:
如果有人感兴趣，我使用的log4j/slf4j依赖项是：
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.7</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.7</version>
</dependency>
