JAR command - java.lang.UnsatisfiedLinkError

I have just spent some time looking thru the archives
for this problem but am having no luck :(
Apparently, something has happened recently to change
our environment and the Systems Programmer is away
at school.  I think that some PTF's were recently
applied.

We have a QSH command in a CL program to zip a file:

QSH        CMD('jar -cfM /MEMAIL/P55055/F55056.ZIP + 
             /MEMail/P55055/F55056.CSV')

and it's failing with a return code of "1".  So, 
I started QSHELL (STRQSH) and entered the JAR command
on a line, pressed enter and received a message that
the JAR command wasn't found -or- I assume that's what
the error is telling me:             

jar

java.lang.UnsatisfiedLinkError

      java/util/zip/ZipFile.<init>(Ljava/io/File;I)V+79 (ZipFile.java:110)

      java/util/jar/JarFile.<init>(Ljava/lang/String;)V+9 (JarFile.java:57)

 
sun/misc/URLClassPath$JarLoader.<init>(Ljava/net/URL;Ljava/net/URLStreamHand
ler;Ljava/util/HashMap;)V+36 (URLClassPath.java
:455)


After looking thru the archives I decided to set
the CLASSPATH environment variable as follows:

                         Display Environment Var (*SYS)

 

 Name  :   CLASSPATH                                          
 Value :   '/QIBM/ProdData/Java400/jdk12/bin:/QIBM/ProdData/Java400/ext'

Unfortunately, Qshell still can't find the JAR command.  
Have also tried changing the "jdk12" in the CLASSPATH 
to be "jdk13" and "jdk118".

I'm not sure I'm on the right path to solving this
problem.  Any help would be appreciated :)

Thanks,
Terry