如何找到特定的组织/ slf4j /记录器jar文件中的多个绑定从apache zip？ [英] How to find specific org/slf4j/Logger jar file out of multiple bindings from the apache zip?

问题描述

我正在使用Apache PDFBox& POIFSFilesystem从pdf中提取文本并导出到Excel中，但添加apache-log4j-2.8.2-bin jar文件后，我的应用程序抛出错误。我尝试添加org / slf4j / Logger jar文件，但仍然抛出错误。可能是我无法找到确切的文件..！

 线程main中的异常java.lang.NoClassDefFoundError：org / slf4j / Logger $ b $ at org .apache.logging.slf4j.SLF4JLoggerContext.getLogger（SLF4JLoggerContext.java:39）
 at org.apache.logging.log4j.jcl.LogAdapter.newLogger（LogAdapter.java:34）
 at org.apache .logging.log4j.jcl.LogAdapter.newLogger（LogAdapter.java:30）
 at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger（AbstractLoggerAdapter.java:52）
 at org.apache .logging.log4j.jcl.LogFactoryImpl.getInstance（LogFactoryImpl.java:40）
 at org.apache.logging.log4j.jcl.LogFactoryImpl.getInstance（LogFactoryImpl.java:55）
 at org.apache .commons.logging.LogFactory.getLog（LogFactory.java:655）
 at org.apache.pdfbox.pdmodel.PDDocument。< clinit>（PDDocument.java:80）
  

加入SLF4J-1.7.25后。我得到了以下错误。它超过了9K行。

  SLF4J：类路径包含多个SLF4J绑定。 
 SLF4J：在[jar：file：/ D：/apache-log4j-2.8.2-bin/log4j-slf4j-impl-2.8.2.jar！/org/slf4j/impl/StaticLoggerBinder.class ] 
 SLF4J：在[jar：file：/ D：/slf4j-1.7.25/slf4j-android-1.7.25.jar！/org/slf4j/impl/StaticLoggerBinder.class]中找到绑定
 SLF4J：在[jar：file：/ D：/slf4j-1.7.25/slf4j-jcl-1.7.25.jar！/org/slf4j/impl/StaticLoggerBinder.class]中找到绑定
 SLF4J：找到绑定[jar：file：/ D：/slf4j-1.7.25/slf4j-jdk14-1.7.25.jar！/org/slf4j/impl/StaticLoggerBinder.class] 
 SLF4J：在[jar：file： /D:/slf4j-1.7.25/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class] 
 SLF4J：在[jar：file：/ D：/ slf4j中找到绑定-1.7.25 / slf4j-nop-1.7.25.jar！/org/slf4j/impl/StaticLoggerBinder.class] 
 SLF4J：在[jar：file：/ D：/slf4j-1.7.25/ slf4j-simple-1.7.25.jar！/org/slf4j/impl/StaticLoggerBinder.class] 
 SLF4J：请参阅http://www.slf4j.org/codes.html#multiple_bindings以获取解释。 
 SLF4J：实际绑定类型为[org.apache.logging.slf4j.Log4jLoggerFactory] ​​
线程main中的异常java.lang.StackOverflowError $ b $ org.apache.logging.log4j中的异常。 LogManager.getContext（LogManager.java:194）
在org.apache.logging.log4j.spi.AbstractLoggerAdapter.getContext（AbstractLoggerAdapter.java:122）
在org.apache.logging.slf4j.Log4jLoggerFactory。 getContext（Log4jLoggerFactory.java:43）
 at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger（AbstractLoggerAdapter.java:46）
 at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger（ Log4jLoggerFactory.java:29）
  

解决方案

java.lang.NoClassDefFoundError

通常表示jar文件没有正确提供。从 slf4j.org/download 下载slf4j jar文件，然后重试。
此外，最好使用诸如 Maven 之类的东西来解决所有的依赖关系，以便这些问题可以避免。

I am using Apache PDFBox & POIFSFilesystem which extract text from the pdfs and export into excel but my application is throwing below error ever after adding the apache-log4j-2.8.2-bin jar files.I tried to add org/slf4j/Logger jar files but its still throwing error. may be i could not find exact files..! pls suggest.

Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/Logger
    at org.apache.logging.slf4j.SLF4JLoggerContext.getLogger(SLF4JLoggerContext.java:39)
    at org.apache.logging.log4j.jcl.LogAdapter.newLogger(LogAdapter.java:34)
    at org.apache.logging.log4j.jcl.LogAdapter.newLogger(LogAdapter.java:30)
    at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger(AbstractLoggerAdapter.java:52)
    at org.apache.logging.log4j.jcl.LogFactoryImpl.getInstance(LogFactoryImpl.java:40)
    at org.apache.logging.log4j.jcl.LogFactoryImpl.getInstance(LogFactoryImpl.java:55)
    at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:655)
    at org.apache.pdfbox.pdmodel.PDDocument.<clinit>(PDDocument.java:80)

After adding SLF4J-1.7.25. I got below error. its more than 9k lines.

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/D:/apache-log4j-2.8.2-bin/log4j-slf4j-impl-2.8.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/D:/slf4j-1.7.25/slf4j-android-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/D:/slf4j-1.7.25/slf4j-jcl-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/D:/slf4j-1.7.25/slf4j-jdk14-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/D:/slf4j-1.7.25/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/D:/slf4j-1.7.25/slf4j-nop-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/D:/slf4j-1.7.25/slf4j-simple-1.7.25.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.apache.logging.slf4j.Log4jLoggerFactory]
Exception in thread "main" java.lang.StackOverflowError
    at org.apache.logging.log4j.LogManager.getContext(LogManager.java:194)
    at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getContext(AbstractLoggerAdapter.java:122)
    at org.apache.logging.slf4j.Log4jLoggerFactory.getContext(Log4jLoggerFactory.java:43)
    at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger(AbstractLoggerAdapter.java:46)
    at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:29)

解决方案

java.lang.NoClassDefFoundError

generally means that the jar file is not provided correctly. Download the slf4j jar file from slf4j.org/download and try again. Also, it is always better to use something like Maven to resolve all your dependencies so that these problems can be avoided.

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