dblevins commented on code in PR #91:
URL: https://github.com/apache/johnzon/pull/91#discussion_r873201691


##########
johnzon-mapper/src/main/java/org/apache/johnzon/mapper/MappingParserImpl.java:
##########
@@ -373,11 +377,20 @@ private Object buildObject(final Type inType, final 
JsonObject object, final boo
         }
 
         Object t;
-        if (classMapping.factory.getParameterTypes() == null || 
classMapping.factory.getParameterTypes().length == 0) {
-            t = classMapping.factory.create(null);
-        } else {
-            t = classMapping.factory.create(createParameters(classMapping, 
object, jsonPointer));
+        try {
+            if (classMapping.factory.getParameterTypes() == null || 
classMapping.factory.getParameterTypes().length == 0) {
+                t = classMapping.factory.create(null);
+            } else {
+                t = classMapping.factory.create(createParameters(classMapping, 
object, jsonPointer));
+            }
+        } catch (Exception e) {
+            final String message = String.format("%s cannot be constructed to 
deserialize %s: %s%n%s",

Review Comment:
   I'm my testing I haven't seen any scenarios where MappingException is 
thrown.   Issues appear to get wrapped as IllegalStateException before reaching 
this catch.



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