It should be noted there are only a couple of places .jar files are
allowed in tomcat:

1. WEB-INF/lib
2. common/lib of the tomcat installation directory

WEB-INF itself is not checked or scanned for .jar files at all. In
addition, any files in the classes directory will override their
equivalent in the lib directory. This occurs regardless of it being in
WEB-INF/classes or common/classes

As to the issue below, are you sure you don't have similar classes (in
name and package) in both common/lib and WEB-INF/lib? Seems like
there's a classloader issue at work here. Take a look at the
classloader howto at
http://tomcat.apache.org/tomcat-5.5-doc/class-loader-howto.html. It
might offer some ideas.

--David

aladdin wrote:
> When I put my webapp.jar file in the WEB-INF directory, it doesn't find the
> app. When I exploded it into the classes directory, and associated
> subdirectories, they are found fine, but I get this problem (the one below).
>
> This, it turns out, is triggered by the fact I have the webapp.jar file in the
> lib directory and all the classes unpacked in the classes directory (both
> under WEB-INF, of course). Getting rid of the webapp.jar file in the lib
> directory solves the problem below, but now tomcat won't use that the jar
> file in the lib directory, even though when it's unpacked in the classes
> directory, he seems perfectly happy. Is there some magic I need for tomcat
> to use .jar files in the WEB-INF/lib directory, like an entry in web.xml or
> server.xml?
>
> On Friday 16 February 2007 22:52, aladdin wrote:
>  
>> I was getting a message like "SEVERE PersistenceManager persistence not
>> enabled", or something like that (I don't remember) so I disabled
>> (commented out) the Manager tag in server.xml that configured the
>> PersistenceManager. Now, I'm getting
>>
>> Feb 16, 2007 9:26:34 PM org.apache.catalina.loader.WebappClassLoader
>> modified INFO:   Additional JARs have been added
>> Feb 16, 2007 9:26:34 PM org.apache.catalina.core.StandardContext reload
>> INFO: Reloading this Context has started
>>
>> over and over in the log files. Anyone know what's causing this? I
>> thought maybe tomcat was restarting, but the PID doesn't change. It seems
>> to work, but it's filling up my log files.
>>
>> TIA
>>
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