FULL PRODUCT VERSION :
java version "1.8.0_112"
Java(TM) SE Runtime Environment (build 1.8.0_112-b15)
Java HotSpot(TM) Server VM (build 25.112-b15, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Linux version 3.10.0-693.2.1.el7.x86_64 (mockbuild@x86-ol7-builder-03.us.oracle.com) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-16) (GCC) ) #1 SMP Tue Sep 5 10:56:07 PDT 2017


A DESCRIPTION OF THE PROBLEM :
Rare intermittent issue occurs when parsing small xml documents <32K. Full stack trace:

java.lang.NullPointerException
at com.sun.xml.internal.stream.Entity$ScannedEntity.<init>(Entity.java:405)
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:825)
at com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(XMLVersionDetector.java:189)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:799)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:123)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1210)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:568)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.parse(SAXParserImpl.java:302)


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
 Not easily reproducible.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
XML document successfully parsed.
ACTUAL -
NullPointerException is thrown

REPRODUCIBILITY :
This bug can be reproduced rarely.