No, Mary is just running an example from the install documentation. And since
the code is calling BasicConfigurator.configure(), there is no need for a
config file in the classpath (though it is generally recommended to use a
config file rather than configure via code).
Mary, please provide an example of your java command line when you run this.
It should look something like...
java -cp log4j-1.2-17.jar Hello
Jake
On Tue, 14 May 2013 10:41:18 +0900
Remko Popma <rem...@yahoo.com> wrote:
Mary,
Gary was referring to log4j-2.0. While generally more awesome (ahem), it
does need those 2 jars to run.
You seem to be using log4j-1.2.
Then you should only need the one jar.
You also need a log4j.properties or log4j.xml file in a directory that is in
the classpath. The site should have some sample config files.
In your code, I don't think you need to call BasicConfigurator.configure();
I think you can safely remove that line; log4j will pick up your config file
from the classpath.
Sent from my iPhone
On 2013/05/14, at 10:30, Mary Laude <marylaudeci...@gmail.com> wrote:
Hey - thanks for the quick reply! Ya know, I read that bit
but the jar file I have is named log4j-1.2-17.jar, and I thought
it comprised everything. When I downloaded the code, that's
the only jar file there was. Clearly, I was delusional! I'll go
look for the corresponding API and core jar files...
Thanks again!
On Mon, May 13, 2013 at 6:00 PM, Gary Gregory <garydgreg...@gmail.com>wrote:
You need the API and core jar files on your classpath for compilation
and runtime.
Gary
On May 13, 2013, at 20:46, Mary Laude <marylaudeci...@gmail.com> wrote:
Hello -
I can write, compile, and successfully run a Java program
to look at a .jar file and list the classes defined therein, but
I can't for the life of me get your "Using log4j" java code shown
in 1-2.17's INSTALL doc to work.
Perhaps there's some other magic that needs to happen to get
this code snippet you wrote to yield output?
----------------------------------------------------------------------------------------
You can now test your installation by first compiling the following
simple program.
import org.apache.log4j.Logger;
import org.apache.log4j.BasicConfigurator;
public class Hello {
private static final Logger logger = Logger.getLogger(Hello.class);
public
static
void main(String argv[]) {
BasicConfigurator.configure();
logger.debug("Hello world.");
logger.info("What a beatiful day.");
}
}
-----------------------------------------------------------------------------------------
I understand how CLASSPATH works, etc. I can get it to compile but
even if I again (with option -cp) specify exactly where the .class file
is
that it just created from the compile, it still can't find what it needs.
Depending on where I've put things and what I tell it, I get one of these
failing results when I try to run the executable:
(1)
java.lang.NoClassDefFoundError: org/apache/log4j/Logger
at Hello.<clinit>(Hello.java:6)
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Logger
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
... 1 more
Exception in thread "main"
or (2)
Error: Could not find or load main class Hello
Please, I am an old UNIX geek but this is really really frustrating me.
I have looked literally EVERYWHERE to find out what the problem is
but of course I am apparently the first and only person to ever have this
problem. Ha!
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