The version of this test committed to 7u has a bad license header compared to the one in 8u:

diff -r 3bf99e4002e2 test/javax/xml/jaxp/transform/8062923/XslSubstringTest.java
--- a/test/javax/xml/jaxp/transform/8062923/XslSubstringTest.java Thu Aug 27 18:05:51 2015 +0100
+++ b/test/javax/xml/jaxp/transform/8062923/XslSubstringTest.java Thu Aug 27 18:13:05 2015 +0100
@@ -1,6 +1,24 @@
 /*
  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
- * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
  */
 
 /**

This was added by:

changeset: 7957:d63b4806622e
user: aefimov
date: Tue Jan 27 15:04:31 2015 +0300
summary: 8062923: XSL: Run-time internal error in 'substring()'

We should sync with the correctly licensed 8 version.