The following JCK tests started failing in JCK-devtools-8c for all the JDK 8c builds after Sep 02.
api/javax_xml/bind/JAXBContext/java2schema/CustomizedMapping/packages/XmlAccessorType/srcInherit5.html#testCase0001
api/javax_xml/bind/JAXBContext/java2schema/CustomizedMapping/packages/XmlAccessorType/srcInherit5.html#testCase0002
api/javax_xml/bind/JAXBContext/java2schema/CustomizedMapping/packages/XmlAccessorType/srcInherit5.html#testCase0003
api/javax_xml/bind/JAXBContext/java2schema/CustomizedMapping/packages/XmlAccessorType/srcNone.html#testCase0001
api/javax_xml/bind/JAXBContext/java2schema/CustomizedMapping/packages/XmlAccessorType/srcNone.html#testCase0002
api/javax_xml/bind/JAXBContext/java2schema/CustomizedMapping/packages/XmlAccessorType/srcNone.html#testCase0003
api/javax_xml/bind/JAXBContext/java2schema/CustomizedMapping/property_fields/XmlMimeType/src01.html#testCase0001
api/javax_xml/bind/JAXBContext/java2schema/CustomizedMapping/property_fields/XmlMimeType/src01.html#testCase0002

The error output is:
[ERROR] Premature end of file.
  line 1 of http://www.w3.org/2005/05/xmlmime

Failed to parse a schema.

Breakdown of these test is:
saturn$ ../../../8c/java-se-8u41-ri/bin/schemagen -d . tests/java2schema/CustomizedMapping/property_fields/XmlMimeType/s
rc01.java
saturn$ ll schema1.xsd
-rw-r--r-- 1 ... ... 537 Sep 12 05:28 schema1.xsd

With proxy:
$ time ../../../8c/java-se-8u41-ri/bin/xjc -verbose -httpproxy $proxy schema1.xsd
parsing a schema...
[ERROR] Premature end of file.
  line 1 of http://www.w3.org/2005/05/xmlmime

Failed to parse a schema.

real 0m1.341s
user 0m0.188s
sys 0m0.054s

No proxy:
saturn$ time ../../../8c/java-se-8u41-ri/bin/xjc -verbose schema1.xsd
parsing a schema...
[WARNING] schema_reference.4: Failed to read schema document 'http://www.w3.org/2005/05/xmlmime&#39;, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
  line 4 of file:/scratch/pchinnas/jenkins/8c/JCK-devtools-8c/schema1.xsd

[WARNING] java.net.ConnectException: Connection timed out
  line 4 of file:/scratch/pchinnas/jenkins/8c/JCK-devtools-8c/schema1.xsd

compiling a schema...
[INFO] generating code
unknown location

generated/ObjectFactory.java
generated/Src.java

real 4m22.883s
user 0m0.769s
sys 0m0.150s