Using log4j via Inline::Java

kreetrapper has asked for the wisdom of the Perl Monks concerning the following question:

Dear fellow monks,

I am currently trying to integrate some Java into a perl program and I seem to be stuck. This is the relevant part of my code:

    
BEGIN {        
   $ENV{CLASSPATH} .= ":log4j.properties:log4j-1.2.14.jar:myclass.jar"
+;
   $ENV{EXTRA_JAVA_ARGS} = "-Dlog4j.debug";
}

use Inline Java  => 'STUDY',
               STUDY => ['mypackage.myclass','org.apache.log4j.Logger'
+],
               AUTOSTUDY => 1;
[download]

As you can see, the Java code I am trying to integrate uses log4j and that seems to be the problem, because when I run this code I get the following warnings:

log4j:WARN No appenders could be found for logger (xxx.yyy.DBConnection).
log4j:WARN Please initialize the log4j system properly.

After googling this message, I found this, where it says:

The reason why you see this message is that your log4j configuration file(i.e. log4j.xml or log4j.properties) is NOT found in the classpath.

But I have a log4j.properties in the same folder as my script and the jars I use. As you can see from the code snippet above, i tried to explicitly add the properties file to the classpath. I also tried to switch on log4j debugging via EXTRA_JAVA_ARGS, but nothing has helped me to get rid of the warnings.

I use perl 5.8.7 on SuSE Linux 10.0 and Inline::Java 0.52.

Any help would be greatly appreciated.

Comment on Using log4j via Inline::Java Download Code

Replies are listed 'Best First'.
Re: Using log4j via Inline::Java by Anonymous Monk on May 18, 2009 at 07:16 UTC
is log4j.properties a JAR? You should add current directory (. or /f/f/o/o/bar)	[reply]
Re^2: Using log4j via Inline::Java by kreetrapper (Scribe) on May 18, 2009 at 07:41 UTC
Oh, my God! That worked! And it was so simple. Thank you very much!	[reply]
Re: Using log4j via Inline::Java by dHarry (Abbot) on May 18, 2009 at 07:56 UTC
In my experience you'll always have to fiddle to make log4j work;) I can think of several things you could try: Add the location of the properties file explicitly to the CLASSPATH. You might want to try to add the full path. Add the properties file to the jar file. Fiddle with the `$ENV{EXTRA_JAVA_ARGS}` part. I think the argument you provide is not correct/complete, i.e. the "-Dlog4j.debug" part. I would expect something like "-Dlog4j.configuration=dir_where_to_find_config_file/log4j.properties". Sanity check: I assume you have established that log4j actually works if you run the java app.? HTH Harry	[reply] [d/l]