[opencms-dev] Different version jars in lib folder

[Paul-Inge Flakstad]

Hi Achim,

Thanks very much for your reply. :)

You're absolutely right, and memory serves you well - they were 334 bytes indeed.

>From what you say, I gather it's risky to have different versions of OpenCms on the same Tomcat, then? (Since they may employ different version jars, which could cause conflict?)

Cheers,
Paul 

> -----Original Message-----
> From: opencms-dev-bounces at opencms.org 
> [mailto:opencms-dev-bounces at opencms.org] On Behalf Of Achim Westermann
> Sent: 14. april 2011 22:41
> To: The OpenCms mailing list
> Subject: Re: [opencms-dev] Different version jars in lib folder
> 
> Hi Paul,
> 
> > For example, all of these:
> > lucene-core-1.9.1.jar
> > lucene-core-2.1.0.jar
> > lucene-core-2.2.0.jar
> > lucene-core-2.3.1.jar
> > lucene-core-2.3.2.jar
> > lucene-core-2.4.1.jar
> 
> Most often this is the case for OpenCms installations that have 
> undergone at least one update. The setup routine will 
> overwrite previous 
> libraries with an empty jar file (size something like 334 
> bytes, don't 
> have this in memory) because in the past deletion of jar files failed 
> under some circumstances. It's OK to delete all the tiny jar files.
> 
> > (Most of the commons-xxx jars, and a bunch of others as 
> well, are also
> > present in multiple versions.)
> > What could be the cause of all these multiple versions? Is 
> it safe to
> > delete the older versions and just keep the most recent?
> > On a side-note:
> > Can two different versions of the "same" jar cause 
> conflicts, if they
> > reside in the separate webapps' lib folder?
> > For example:
> > webapp_one/WEB-INF/lib/mylibrary-v1.0.jar
> > webapp_two/WEB-INF/lib/mylibrary-v2.0.jar
> 
> Indeed this can cause ClassCastExceptions. It's a matter of luck in 
> which order the jar files are loaded by the ClassLoaders. Duplicate 
> non-empty jar files have to be deleted as you described.
> 
> HTH,
> 
> Achim
> 
> 
> _______________________________________________
> This mail is sent to you from the opencms-dev mailing list
> To change your list options, or to unsubscribe from the list, 
> please visit
> http://lists.opencms.org/mailman/listinfo/opencms-dev
>