If you face any problems with the signature of the jar files delivered with the software, have a look to this Oracle page:
If the General Exception error 'JAR resources in JNLP file are not signed by same certificate' occurs as shown below, do the following.
Compared to previous version, JAVA-clients have changed the method of verifying certificates. If JNLP was configured with the old method, this would cause the above error message.
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Proceed as described under Configure Oracle Web Start.
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Clear the Java Cache on your client machines.
If this does not help to resolve your problem, please raise a Case via Hexagon Smart Community.