JBoss EAP has heap growth in com.sun.org.apache.xerces.internal.dom.DocumentImpl from CXF WebService processing after upgrading to EAP 8

Issue

• After upgrading from EAP 7 to EAP 8, we see large heap growth in a com.sun.org.apache.xerces.internal.dom.DocumentImpl object's nodeUserData map after many CXF web service client calls:

Class Name                                                      | Shallow Heap | Retained Heap | Percentage
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com.sun.org.apache.xerces.internal.dom.DocumentImpl @ 0xe25d4778|          136 |   158,840,920 |     26.33%
'- nodeUserData java.util.HashMap @ 0xe25d4870                  |           48 |   158,840,760 |     26.32%
   '- table java.util.HashMap$Node[1048576] @ 0xfe700000        |    4,194,320 |   158,840,712 |     26.32%

• The heap growth in this map is from many com.sun.org.apache.xerces.internal.dom.TextImpl objects with similar repeating string values:

Class Name                                     | Objects | Shallow Heap | Retained Heap
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com.sun.org.apache.xerces.internal.dom.TextImpl| 540,569 |   17,298,208 | >= 38,351,888
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