log4J找不到JAR使用的属性文件

Question

We have a JAR that is run from the command prompt in Windows with the following parameter for log4J:

-Dlog4.properties.file=C:/[folderName]/apps/[appName]/config/log4j.properties

Even though the log4j.properties file is indeed in the path above, log4j fails to find it and thus fails to configure properly, and running the command with the parameter -Dlog4j.debug doesn't give me much more information:

log4j: Trying to find [log4j.xml] using context classloader sun.misc.Launcher$Ap pClassLoader@92e78c. log4j: Trying to find [log4j.xml] using sun.misc.Launcher$AppClassLoader@92e78c class loader. log4j: Trying to find [log4j.xml] using ClassLoader.getSystemResource(). log4j: Trying to find [log4j.properties] using context classloader sun.misc.Laun cher$AppClassLoader@92e78c. log4j: Trying to find [log4j.properties] using sun.misc.Launcher$AppClassLoader@ 92e78c class loader. log4j: Trying to find [log4j.properties] using ClassLoader.getSystemResource(). log4j: Could not find resource: [null]. log4j:WARN No appenders could be found for logger (com.xxx.yyy.appName.Main). log4j:WARN Please initialize the log4j system properly.

I feel like I'm missing somrthing fundamental, so I'm open to ideas...

Answer 1

From the short introduction to log4j try using file: as a prefix on the path, only if your properties are not on the classpath. The property is also called log4j.configuration therefore your JVM argument should have following form:
-Dlog4.configuration=file:/c:/[...]/log4j.properties

Answer 2

试试这个参数：

-Dlog4j.configuration=file:///C:/[folderName]/apps/[appName]/config/log4j.properties

Answer 3

It looks as though my problem was due to a Java version mismatch. The application in question currently only runs on 1.5, and I built the JAR accordingly. But one of its dependencies (ie, another JAR) was built with 1.6. Built this other JAR with 1.5 and the problem went away.