We have resolved the jmap issues after adding Serviceability Agent support to G1, with:
1) 7059019: G1: add G1 support to the SA
Also, jstat now works with G1 since this CR was pushed:
2) 6946417: G1: Java VisualVM does not support G1 properly
and also after pushing some extra fixed for jstat:
3) 7075646: G1: fix inconsistencies in the monitoring data
1) and 3) with into hs23 but we are expecting them to be transplanted to hs22. I'm closing this as a dup (I arbitrarily chose the first CR to put in the Duplicate Of field).