Bug#718946: Allow for parallel installation of tomcat7 and tomcat6

[Ralf Hauser]

Package: tomcat7

After installing tomcat7, many links of tomcat6 were gone.

The real Jars in /usr/share/java are not the problem since they contain the
version numbers such as  tomcat-juli-7.0.28.jar .
But without real need, when installing tomcat7, the tomcat-juli-6.0.35.jar
was removed.

The cause for the problem appears to lie in the non-major-version-aware
sym-links e.g. in /usr/share/tomcat7/bin/

It contains a tomcat-juli.jar as symlink to ../../java/tomcat-juli.jar .

The problem could be solved if this were 
  tomcat-juli.jar --> ../../java/tomcat7-juli.jar 
and
/usr/share/java had an additional symlink
tomcat7-juli.jar --> tomcat-juli-7.0.28.jar

The current-below setup unfortunately doesn't work :(

ls -lart /usr/share/tomcat7/bin/../../java/tomcat-juli.jar
lrwxrwxrwx 1 root root 22 Dec  8  2012
/usr/share/tomcat7/bin/../../java/tomcat-juli.jar -> tomcat-juli-7.0.28.jar

ls -lart /usr/share/tomcat6/bin/../../java/tomcat-juli.jar
lrwxrwxrwx 1 root root 22 Jul 23 17:17
/usr/share/tomcat6/bin/../../java/tomcat-juli.jar -> tomcat-juli-6.0.35.jar

Thanks for any feedback in advance!

        Ralf