[15] RFR: 8239836: ZoneRules.of() doesn't check transitionList/standardOffsetTL arguments validity

[naoto.sato at oracle.com]

Hello,

Please review the fix to the following issue:

https://bugs.openjdk.java.net/browse/JDK-8239836

The proposed changeset is located at:

https://cr.openjdk.java.net/~naoto/8239836/webrev.00/

It turned out that 'transitionList' is not necessarily a superset of
'standardOffsetTransitionList', as in some occasions where a standard 
offset change and a savings change happen at the same time (canceling 
each other), resulting in no wall time transition. This means that the 
"rules" in the sample code is a valid ZoneRules instance.

However, there is an assumption in ZoneRules where no (wall time) 
transition means the fixed offset zone. With that assumption, the 
example rule is considered a fixed offset zone which is not correct. So 
the fix proposed here is not to throw an IAE but to recognize the rule 
as a valid, non-fixed offset ZoneRules instance.

Naoto