The fix for BUG JDK-8149915 has introduced a regression in JCK test api/xsl/conf/copy/copy19.html#copy19:
MultiJVM group agent ID: 1
java version "9-internal"
OpenJDK Runtime Environment (build 9-internal+0-2016-02-23-012828.aefimov.9)
OpenJDK 64-Bit Server VM (build 9-internal+0-2016-02-23-012828.aefimov.9, mixed mode)

Failed to parse as XML. Cause:
warning;org.xml.sax.SAXParseException; lineNumber: 2; columnNumber: 10; XML document structures must start and end within the same entity.
Parsing as text.
Failed to parse as XML. Cause:
warning;org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 53; XML document structures must start and end within the same entity.
Parsing as text.
mismatch-value;TEXT()len=43;TEXT()len=62;lengths do not match
mismatch-value-gold;TEXT();
<?xml version="1.0" encoding="ISO-8859-1"?>
mismatch-value-text;TEXT();
<?xml version="1.0" encoding="ISO-8859-1"?><out>abcd\u00e8fgh</out>
XHTFileCheckService results were not equal.
Expected result:
<?xml version="1.0" encoding="ISO-8859-1"?>
<out>abcd\u00e8fgh</out>

Actual result:
<?xml version="1.0" encoding="ISO-8859-1"?><out>abcd\u00e8fgh</out>
result: Failed. test cases: 1; all failed; first test case failure: testTransformation


test result: Failed. test cases: 1; all failed; first test case failure: testTransformation

Failure cause: JDK-8149915 fix introduced back the issue fixed by JDK-8021366