Maven SLF4J：类路径包含多个SLF4J绑定

Question

我在运行我的java代码时遇到了运行时异常。 请有人帮我解决绑定冲突。

    SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/Users/Air/Desktop/sms/slf4j-1.7.7/slf4j-android-1.7.7.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/Users/Air/Desktop/sms/slf4j-1.7.7/slf4j-jcl-1.7.7.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/Users/Air/Desktop/sms/slf4j-1.7.7/slf4j-jdk14-1.7.7.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/Users/Air/Desktop/sms/slf4j-1.7.7/slf4j-log4j12-1.7.7.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/Users/Air/Desktop/sms/slf4j-1.7.7/slf4j-nop-1.7.7.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/Users/Air/Desktop/sms/slf4j-1.7.7/slf4j-simple-1.7.7.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.AndroidLoggerFactory]
Exception in thread "main" java.lang.ExceptionInInitializerError
Caused by: java.lang.RuntimeException: Fatal error in constructor!
    ... 2 more

Answer 1

运行mvn dependency:tree并搜索哪个依赖项具有您不想要的slf4j实现，然后使用依赖项排除将它们排除，例如：

<dependency>
    <groupId>org.someexternallib</groupId>
    <artifactId>someexternallibartifact</artifactId>
    <version>...</version>

    <exclusions>
       <exclusion> 
          <groupId>org.slf4j</groupId>
          <artifactId>slf4j-log4j12</artifactId>
       </exclusion>
       <exclusion> 
          <groupId>log4j</groupId>
          <artifactId>log4j</artifactId>
      </exclusion>
    </exclusions> 
</dependency>

Answer 2

看来你有几个SLF4J的实现; 你应该排除所有不必要的

Answer 3

此错误意味着您在类路径中有多个SLF4J实现。 查看错误具体说明的内容。 即： SLf4J: Found binding in..... （这将打印它找到StaticLoggerBinder.class实例的所有jar文件）。 消除类路径中的所有这些jar，除了你需要StaticLoggerBinder.class实现的jar。

Answer 4

这个作品!! 更新porm.xml

<dependency>
<groupId>org.someexternallib</groupId>
<artifactId>someexternallibartifact</artifactId>
<version>...</version>

<exclusions>
   <exclusion> 
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
   </exclusion>
   <exclusion> 
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
  </exclusion>
</exclusions> 

Answer 5

您可以转到POM.xml，打开依赖关系层次结构并找到slf4j条目。除了通过右键单击“排除maven工件”排除其余部分