We are facing problems with signed jars in Xtext repositories [1] that fail the 
jarsigner's verification. The problem was initially reported in bug#533359 [2]. 
Initially it seemed that a specific Orbit library, org.antlr.runtime, was 
affected, but running
   jarsigner -verify -strict
on Xtext’s whole composite repository, and there are multiple other jars 
suffering the same problem. I created a job on Xtext’s JIPP that lists result 
of jarsigner: [3]

With additional verbosity of jarsigner’s output the following entries are 
printed (full text in [1], comment#20)
      [certificate is valid from 1/29/96 1:00 AM to 8/2/28 1:59 AM]
      [CertPath not validated: Algorithm constraints check failed: MD2withRSA]
So how can this be? I’m not familiar with the details behind.

And how could this be fixed? Do we have to sign again all jars? How do we come 
to valid repositories again?

Do other projects have similar problems?

Kind regards,
~Karsten

[1] http://download.eclipse.org/modeling/tmf/xtext/updates/composite/releases/ 
<http://download.eclipse.org/modeling/tmf/xtext/updates/composite/releases/> 
[2] https://bugs.eclipse.org/bugs/show_bug.cgi?id=533359 
<https://bugs.eclipse.org/bugs/show_bug.cgi?id=533359> 
[3] https://ci.eclipse.org/xtext/job/xtext-jarsigner-verify/3/consoleFull 
<https://ci.eclipse.org/xtext/job/xtext-jarsigner-verify/3/consoleFull>


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