Updating to signed JARs causes problems for older Java versions?

Bear with me on this one -- not a Java developer, but an end user of Java products looking for a little clarification.
We use a product which delivers a Java application via JAR file / web to end users (GlobalScape's EFT server). With the recent release of Java 7 Update 51, users have been running into issues running these JAR files as they are not properly "signed". We're working with the vendor to get updated signed JAR files in place, but they've warned us that these new JAR files will cause errors (or maybe not work at all) on folks who aren't running Java 7 Update 51.
Trying to wrap my head around why that might be. Best theory I can come up with from perusing threads here along with the Java team blogs is that the new security attributes used in the updated JAR files aren't "trusted" by older versions of Java (prior to Update 51?).
We're pushing our vendor for clarification, but curious if someone here could help explain.
Thanks!

I suspect the problem with 'new JAR files will cause errors' is mainly because the vendor keeps enhancing their product, and may not any more support older JREs, or the new jars are no more compatible For example, we build our product on JDK 1.5 ... as some users out there must use that one because the 'newer and better' release does not work for them.
But so far, we have not seen any problems running the 'JRE 7 Compliant' applications on older releases ... provided you can make your application run on latest JRE 7.
In most cases, one can simply remove the previous signature, add (now required) attributes, and sign the same jar again.
But I have yet to find a vendor that would simply add attributes to some older release and re-sign those. Perhaps they can't repeat the build / QA cycle, and would not 'trust' the re-signed jars.
Our curse are signed Cryptographic Provider jars.
Those must be signed by certificates rooted by Sun/Oracle, and adding attributes invalidates that signature - we can re-sign them, but then they won't work. In our case, we are stuck with 5+ year old Bouncy Castle jars, and it does not help us that their 'current' jars are signed with attributes - they are completely incompatible..
IMHO, Oracle failed to think this all thru - or does not care.

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Author: [email protected]
Date: 2008-03-19 11:39:05 -0700 (Wed, 19 Mar 2008)
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File "mainwindow.py", line 34, in <module>
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Looking for python2.7... 2.7.6 - selected
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File "mainwindow.py", line 34, in <module>
import wx, wx.aui
File "/usr/lib64/python2.7/site-packages/wx-3.0-gtk2/wx/__init__.py", line 45, in <module>
from wx._core import *
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wxpython
wxgtk2.8
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Last edited by Daerandin (2014-01-12 02:32:41)

I'm on wxpython 3.0.0-2 and I'm still getting this issue, both on wxgtk 2.8.12.1-5 and 3.0.0-2.
And it might help to know that playonlinux depends on the package "wxgtk2.8" rather than wxgtk (and also wxpython2.8), which I can't install without borking my system and don't want to anyway because I use wxMupen64Plus, so I installed every other dep and -Sdd'd it.
EDIT: Scratch that, my error is actually similar but not the same:
Looking for python... 3.3.3 - skipped
Looking for python2.7... 2.7.6 - selected
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Last edited by Cadeyrn (2014-02-04 06:29:08)

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