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From Daniel Mikusa <dmik...@gopivotal.com>
Subject Re: Tomcat 6 lib jars
Date Thu, 05 Dec 2013 15:03:32 GMT
On Dec 5, 2013, at 9:42 AM, "Patel, Rakesh (Java)" <Rakesh.Patel2@bskyb.com> wrote:

> Hi,
> 
> I've come across lots of duplicate jars in the tomcat/lib directory on the servers we
have been given by our infrastructure people.
> 
> The directory looks like this:
> 
> -rw-r--r-- 1 root root   15153 Jul 20  2011 annotations-api-6.0.24.jar
> lrwxrwxrwx 1 root root      26 Oct 29 17:05 annotations-api.jar -> annotations-api-6.0.24.jar
> -rw-r--r-- 1 root root 1205728 Jul 20  2011 catalina-6.0.24.jar
> -rw-r--r-- 1 root root   54149 Jul 20  2011 catalina-ant-6.0.24.jar
> lrwxrwxrwx 1 root root      23 Oct 29 17:05 catalina-ant.jar -> catalina-ant-6.0.24.jar
> -rw-r--r-- 1 root root  130751 Jul 20  2011 catalina-ha-6.0.24.jar
> lrwxrwxrwx 1 root root      22 Oct 29 17:05 catalina-ha.jar -> catalina-ha-6.0.24.jar
> lrwxrwxrwx 1 root root      19 Oct 29 17:05 catalina.jar -> catalina-6.0.24.jar
> -rw-r--r-- 1 root root  235744 Jul 20  2011 catalina-tribes-6.0.24.jar
> lrwxrwxrwx 1 root root      26 Oct 29 17:05 catalina-tribes.jar -> catalina-tribes-6.0.24.jar
> lrwxrwxrwx 1 root root      39 Oct 29 17:05 commons-collections.jar -> /usr/share/java/commons-collections.jar
> lrwxrwxrwx 1 root root      32 Oct 29 17:05 commons-dbcp.jar -> /usr/share/java/commons-dbcp.jar
> lrwxrwxrwx 1 root root      32 Oct 29 17:05 commons-pool.jar -> /usr/share/java/commons-pool.jar
> -rw-r--r-- 1 root root  533217 Jul 20  2011 jasper-6.0.24.jar
> -rw-r--r-- 1 root root  108903 Jul 20  2011 jasper-el-6.0.24.jar
> lrwxrwxrwx 1 root root      20 Oct 29 17:05 jasper-el.jar -> jasper-el-6.0.24.jar
> lrwxrwxrwx 1 root root      17 Oct 29 17:05 jasper.jar -> jasper-6.0.24.jar
> lrwxrwxrwx 1 root root      23 Oct 29 17:05 jasper-jdt.jar -> /usr/share/java/ecj.jar
> lrwxrwxrwx 1 root root      25 Oct 29 17:05 log4j.jar -> /usr/share/java/log4j.jar
> lrwxrwxrwx 1 root root      33 Oct 29 17:05 mx4j-jmx.jar -> /usr/share/java/mx4j/mx4j-jmx.jar
> lrwxrwxrwx 1 root root      36 Oct 29 17:05 mx4j-remote.jar -> /usr/share/java/mx4j/mx4j-remote.jar
> -rw-r--r-- 1 root root  832960 Oct 29 17:07 mysql-connector-java-5.1.22-bin.jar
> lrwxrwxrwx 1 root root      59 Oct 29 17:07 mysql-connector-java.jar -> /usr/share/java/tomcat6/mysql-connector-java-5.1.22-bin.jar
> -rw-r--r-- 1 root root   26083 Oct 29 17:07 slf4j-api-1.7.2.jar
> lrwxrwxrwx 1 root root      43 Oct 29 17:07 slf4j-api.jar -> /usr/share/java/tomcat6/slf4j-api-1.7.2.jar
> -rw-r--r-- 1 root root    8819 Oct 29 17:07 slf4j-log4j12-1.7.2.jar
> lrwxrwxrwx 1 root root      47 Oct 29 17:07 slf4j-log4j12.jar -> /usr/share/java/tomcat6/slf4j-log4j12-1.7.2.jar
> lrwxrwxrwx 1 root root      32 Oct 29 17:05 tomcat6-el-2.1-api-6.0.24.jar -> ../tomcat6-el-2.1-api-6.0.24.jar
> lrwxrwxrwx 1 root root      33 Oct 29 17:05 tomcat6-jsp-2.1-api-6.0.24.jar -> ../tomcat6-jsp-2.1-api-6.0.24.jar
> lrwxrwxrwx 1 root root      37 Oct 29 17:05 tomcat6-servlet-2.5-api-6.0.24.jar ->
../tomcat6-servlet-2.5-api-6.0.24.jar
> -rw-r--r-- 1 root root  768357 Jul 20  2011 tomcat-coyote-6.0.24.jar
> lrwxrwxrwx 1 root root      24 Oct 29 17:05 tomcat-coyote.jar -> tomcat-coyote-6.0.24.jar
> -rw-r--r-- 1 root root   69826 Jul 20  2011 tomcat-i18n-es-6.0.24.jar
> lrwxrwxrwx 1 root root      25 Oct 29 17:05 tomcat-i18n-es.jar -> tomcat-i18n-es-6.0.24.jar
> -rw-r--r-- 1 root root   51772 Jul 20  2011 tomcat-i18n-fr-6.0.24.jar
> lrwxrwxrwx 1 root root      25 Oct 29 17:05 tomcat-i18n-fr.jar -> tomcat-i18n-fr-6.0.24.jar
> -rw-r--r-- 1 root root   54441 Jul 20  2011 tomcat-i18n-ja-6.0.24.jar
> lrwxrwxrwx 1 root root      25 Oct 29 17:05 tomcat-i18n-ja.jar -> tomcat-i18n-ja-6.0.24.jar
> lrwxrwxrwx 1 root root      38 Oct 29 17:05 tomcat-juli.jar -> /usr/share/tomcat6/bin/tomcat-juli.jar
> 
> You'll notice generic jar names sum linked to specific jars AND the specific jar also
in the directory. 
> 
> Is this harmless? Or should I ask for a 'cleaner' install from the apache website? I
believe this installation comes from the central CentOS6 repository.

Minimally, I would ask for an up-to-date version of Tomcat.  The libraries seem to indicate
that 6.0.24 is installed and that's pretty old now.  As for the latest 6.0.x release.

As far as the duplicate JAR files, one situation off the top of my head where it could cause
problems is if the versions are different.  For example, if the JAR file in the lib folder
is version X and the symlink points to version Y.  This is problematic because you would have
no idea which version of the JAR is going to be loaded.  You'd want one or the other, either
the file or the symlink.

Personally, and I think many people on the list would agree, I'd suggest against using the
installation from your distro's repository.  They're typically way out-of-date (see my comment
above) and they tend to put files in weird places.  At least weird relative to the standard
installation that is available from tomcat.apache.org.  While having files in weird places
may not directly cause problems, it does make it more difficult for people on this list to
help when you have a problem.

Dan

> 
> Thanks
> 
> Rakesh
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