Here's a little more explanation on what I'm guessing is going on (I've been through this with JBoss in the past.)
A class in Java is identified by the combination of the class name and the classloader that loaded it. Running maven with the -X switch seems to show 2 classloaders; the "ant loader" and the "parent loader". I see the line: [DEBUG] Class org.apache.commons.logging.Log loaded from ant loader But I don't get a debug line about which loader is being used to load Log4JCategoryLog. If that class is getting loaded by the parent loader, then I think we could end up with a ClassCastException somewhere like this: Log foo = (Log) new Log4JCategoryLog(); because Log4JCategoryLog implements (Log ^ parent) but not (Log ^ ant) (Using the notation (Class ^ ClassLoader)). Not that I've opened up a single line of code. This is just what it smells like. I'm still kind of shocked that the very first simple thing I ever tried with Maven is proving this difficult. :) On Tue, 2003-08-12 at 11:32, Paul Libbrecht wrote: > I've had this problem and... guess what... it's a problem of > classloading. At least I'm pretty sure of it. > > I couldn't figure it out but I was implementing my own classloader which > was a new thing for me. > The same happens with sax create drivers methods... > > (I was doing this in jEdit). > > I would look forward to a solution! > > Paul > > > Simon Matic Langford wrote: > > I've not seen this with maven, but it certainly happens with graphical > > junit, I > > think this is a problem with commons-logging, as we're having to work > > around it > > on our current project: > > http://www.mail-archive.com/[EMAIL PROTECTED]/msg02939.htm > > l > > > > I'm not sure how you would fix it on maven tho, sorry. > > > > simon > > > > The information contained in this e-mail is intended only for the person > > or > > entity to which it is addressed and may contain confidential and/or > > privileged material. If You are not the intended recipient of this > > e-mail, > > the use of this information or any disclosure, copying or distribution > > is > > Prohibited and may be unlawful. If you received this in error, please > > contact the sender and delete the material from any computer. The views > > expressed in this e-mail may not necessarily be the views of The PCMS > > Group > > plc and should not be taken as authority to carry out any instruction > > contained. > > > > > > > >>-----Original Message----- > >>From: Tim McCune [mailto:[EMAIL PROTECTED] > >>Sent: 12 August 2003 16:02 > >>To: [EMAIL PROTECTED] > >>Subject: Log4JCategoryLog does not implement Log > >> > >> > >>I am trying out my first maven build. It's a very simple > >>maven.xml file > >>using xdoclet. Here's the file: > >> > >><project> > >> <pregoal name="java:compile"> > >> <attainGoal name="xdoclet:ejbdoclet"/> > >> </pregoal> > >></project> > >> > >>When I run "maven jar", I get the following exception: > >> > >>File...... > >>file:/home/tmccune/.maven/plugins/maven-> xdoclet-plugin-1.2b2/ > >> > >>Element... deploymentdescriptor > >>Line...... 5419 > >>Column.... 39 > >>org.apache.commons.logging.LogConfigurationException: > >>org.apache.commons.logging.LogConfigurationException: Class > >>org.apache.commons.logging.impl.Log4JCategoryLog does not > >>implement Log > >> > >>It looks like there is a class-loading bug somewhere and > >>maven is trying > >>to use 2 different class loaders for Log and Log4JCategoryLog. Has > >>anyone seen this before? I'm kind of surprised that I can't > >>get such a > >>simple build to work, so I'm guessing I must just be doing something > >>stupid here... > >> > >>--------------------------------------------------------------------- > >>To unsubscribe, e-mail: [EMAIL PROTECTED] > >>For additional commands, e-mail: [EMAIL PROTECTED] > >> > > > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
