Unable to apply Sentinel Log Manager Hot Fixes

Symptoms:

When the "servicepack.sh" script is executed as user "novell", the following error is returned by the installation process:

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Novell Sentinel Log Manager 1.0 Update Installer
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Always replace is set to false
Update Novell Sentinel Log Manager installation...
Please enter Novell Sentinel Log Manager installation location [/opt/novell/sentinel_log_mgr_1.0_x86-64] =>
Running the update installer ./service_pack.sh as 'novell' ...
Current version is: 1.0.0.0
Exception in thread "main" java.lang.NoClassDefFoundError: esecurity/install/srvpack/SrvPackExecutor
Caused by: java.lang.ClassNotFoundException: esecurity.install.srvpack.SrvPackExecutor
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
Could not find the main class: esecurity.install.srvpack.SrvPackExecutor. Program will exit.
There was an error applying the hotfix.

In order to switch to user "novell" to execute the installation script, the following command was used:

"su novell"

while the command to use, in order to get the full environment properly setup for the installation, is the following:

"su - novell"