log4j 和 java.lang.NoClassDefFoundError: org/apache/log4j/Layout
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log4j and java.lang.NoClassDefFoundError: org/apache/log4j/Layout
提问by Sardathrion - against SE abuse
I am trying to get a piece of code working with log4j. If I run it via junit tests (ant task), I am getting proper log outputs and all is fine. If I run the code from the command line, I get this:
我正在尝试使用 log4j 获取一段代码。如果我通过 junit 测试（蚂蚁任务）运行它，我会得到正确的日志输出，一切都很好。如果我从命令行运行代码，我会得到：
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/log4j/Layout
at uk.co.bytemark.flexnbd.Main.main(Main.java:29)
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Layout
I tried the two following classpaths but neither helped. The error remains.
我尝试了以下两个类路径，但都没有帮助。错误仍然存在。
export CLASSPATH=/home/yann/java/apache-log4j-1.2.16/log4j-1.2.16.jar
export CLASSPATH=/home/yann/java/apache-log4j-1.2.16/
Even with this
即使有了这个
$ java -cp /home/yann/java/apache-log4j-1.2.16/log4j-1.2.16.jar -jar ./dist/lib/flexnbd-`date +%Y%m%d`.jar server ::1 12345 fileSystem
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/log4j/Layout
at uk.co.bytemark.flexnbd.Main.main(Main.java:29)
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Layout
at java.net.URLClassLoader.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
... 1 more
$ ls -ld /home/yann/java/apache-log4j-1.2.16/log4j-1.2.16.jar
476K -rw-r--r-- 1 yann yann 471K Mar 31 05:16 /home/yann/java/apache-log4j-1.2.16/log4j-1.2.16.jar
Any idea what I am doing wrong?
知道我做错了什么吗？
采纳答案by Sardathrion - against SE abuse
Found the problem. If you use -jar, your CLASSPATH is ignored. A better command line is thus:
发现问题了。如果您使用 -jar，您的 CLASSPATH 将被忽略。因此，更好的命令行是：
java -cp dist/lib/flexnbd-20100716.jar:/home/yann/java/apache-log4j-1.2.16/log4j-1.2.16.jar uk.co.bytemark.flexnbd.Main [...]
Thanks for the help!
谢谢您的帮助！
