在Java 7中使用log4j时找不到log4j.properties

Question

我已经构建了一个可执行jar并使用log4j。首先我使用Java6对其进行了构建，并且运行良好。但是当我将JDK更新到1.7版并再次构建项目时，似乎找不到log4j.properties文件，因为我找不到日志文件，并且控制台中的日志格式也是错误的。

Answer 1

Have you extracted your .JAR file to ensure that "log4j.properties" exists in the root folder? Are you sure that it is named correctly (it is named "log4j.perperties" in your question).

Troubleshooting suggestions:

1. Run app with "-Dlog4j.debug" flag and observe log4j output
2. Run project without "-jar" to avoid jar packaging issues (eg "java -cp ./xxx.jar com.pkg.AppClass")
3. Examine encoding of the log4j.properties file
4. Attempt manual initialization of log4j within your application, first with an external file then with the internal classpath file

I do not see any obvious JDK7 & log4j conflicts with a few minutes of googling, so it doesn't look like a "known JDK7 issue" to me.

Answer 2

I had a similar problem and the logging never came even though the entries were correct. Later I discovered that one of the jar files (jxls-reader-0.9.6.jar) had a file log4j.xml and that was getting loaded first and used as log4j logging property file and hence we did not receive the logs. I've removed the log4j.xml from the jar and it worked perfectly fine.

You may have similar problem, hope it may be similar solution.