Display traceback when import fails, reviewed by Romain

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31918 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Utils.py

@@ -33,6 +33,7 @@ import re
 import string
 import time
 import warnings
+import sys
 try:
   # Python 2.5 or later
   from hashlib import md5 as md5_new
@@ -71,6 +72,7 @@ from Products.ERP5Type.Accessor.Constant import Getter as ConstantGetter
 from Products.ERP5Type.Accessor.Interface import Getter as InterfaceGetter
 from Products.ERP5Type.Cache import getReadOnlyTransactionCache
 from Products.ERP5Type.TransactionalVariable import getTransactionalVariable
+from zExceptions import ExceptionFormatter
 from zLOG import LOG, BLATHER, PROBLEM, WARNING
 
 #####################################################
@@ -1122,8 +1124,10 @@ def createConstraintList(property_holder, constraint_definition):
   try:
     consistency_class = getattr(Constraint, constraint_definition['type'])
   except AttributeError:
-    LOG("ERP5Type", PROBLEM, "Can not find Constraint: %s" % \
-                       constraint_definition['type'])
+    exc_info = sys.exc_info()
+    LOG("ERP5Type", PROBLEM, "Can not find Constraint: %s\n%s" % \
+                      (constraint_definition['type'],
+                      ''.join(ExceptionFormatter.format_exception(*exc_info))))
     raise ConstraintNotFound(repr(constraint_definition))
   consistency_instance = consistency_class(**constraint_definition)
   property_holder.constraints += [consistency_instance]