Error in GDML parsing when using spack installation

[vvolkl]

The spack-installed geant4 tries to validate the schema when using GDMLDetectorConstructore, and fails with:

-------- EEEE ------- G4Exception-START -------- EEEE -------
*** G4Exception : InvalidRead
      issued by : G4GDMLRead::Read()
ERROR - Empty document or unable to validate schema!
        Check Internet connection is ON in case of schema
        validation enabled and location defined as URL in
        the GDML file - Sim/SimG4Common/gdml/example.xml - being imported!
        Otherwise, verify GDML schema server is reachable!
*** Fatal Exception *** core dump ***
 **** Track information is not available at this moment
 **** Step information is not available at this moment

-------- EEEE -------- G4Exception-END --------- EEEE -------


*** G4Exception: Aborting execution ***
Aborted (core dumped)

The geant4 from lcg either skips this validation or succeeds, not yet clear to me.

[gganis]

Perhaps we should report to G4 team? Gunter Folger or even Dmitri (Konstantinov)?

[vvolkl]

Yes, that's a good idea. It can be reproduced with the geant4 examples, so it should be possible for them to investigate it. I'll write an email.

[vvolkl]

There seems to be a difference in the way expat is configured in the geant4 installations. Investigating this now