log4j:ERROR A "org.jboss.logging.appender.FileAppender" object is not assignable to a "org.apache.log4j.Appender" variable.
jboss部署專案中遇到如下錯誤資訊：
- 09:12:54,062 ERROR [STDERR] log4j:ERROR A "org.jboss.logging.appender.FileAppender" object is not assignable to a "org.apache.log4j.Appender" variable.
- 09:12:54,062 ERROR [STDERR] log4j:ERROR The class "org.apache.log4j.Appender" was loaded by
- 09:12:54,062 ERROR [STDERR] log4j:ERROR [WebappClassLoader
- delegate: false
- repositories:
- /WEB-INF/classes/
- ----------> Parent Classloader:
- org.jboss.mx.loading.UnifiedClassLoader3@17c50b9{ url=file:/D:/jboss-4.2.3.GA/server/default/deploy/jboss-web.deployer/ ,addedOrder=6}
- ] whereas object of type
- 09:12:54,062 ERROR [STDERR] log4j:ERROR "org.jboss.logging.appender.FileAppender" was loaded by [org.jboss.system.server.NoAnnotationURLClassLoader@1292d26].
- 09:12:54,062 ERROR [STDERR] log4j:ERROR Could not instantiate appender named "FILE".
從錯誤資訊中可知，原因是jboss的日誌jar包和專案中新增的日誌jar包衝突，解決方法很簡單，找到專案中的log4j.jar和commons-logging.jar刪除即可。
新問題出現：
以上處理方式發現另外一個問題，專案在console輸出的一些資訊丟失。需要找到更好的方式解決。
以上問題解決方法：
無需刪除專案中的log4j.jar和commons-logging.jar的方法，將jboss/lib中的jboss-common.jar包複製到專案的lib中即可。這樣就可以讓專案中的日誌和jboss中的日誌一起工作。
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