This is probably the same root cause as Xalan bug
 https://issues.apache.org/jira/browse/XALANJ-2571
 (ArrayIndexOutOfBoundsException with supplementary characters,
 disable-output-escaping="yes").

The input XML file contains Unicode supplementary characters. Transforming it
 with disable-output-escaping="yes" results in ArrayIndexOutOfBoundsException:

 C:\diag\2013\xslbug>java org.apache.xalan.xslt.Process -in test.xml -xsl
 test.xsl -out test_jdk.out
 file:///C:/diag/2013/xslbug/test.xsl; Line #8; Column #63;
 java.lang.ArrayIndexOutOfBoundsException: 1024

 Sorry, I don't know how to get a stack trace from the command line. But
when
 this occurs in our code, we can get a stack trace and see that the cause is in

WriterToUTF8Buffered:
 Caused by: java.lang.ArrayIndexOutOfBoundsException
   Message: 1024
        68: at org.apache.xml.serializer.WriterToUTF8Buffered.write(WriterToUTF8Buffered.java:290)
        67: at org.apache.xml.serializer.ToStream.charactersRaw(ToStream.java:1360)
        66: at org.apache.xml.serializer.ToStream.characters(ToStream.java:1433)
        65: at org.apache.xml.serializer.ToHTMLStream.characters(ToHTMLStream.java:1562)
        64: at org.apache.xml.utils.FastStringBuffer.sendSAXcharacters(FastStringBuffer.java:999)
        63: at org.apache.xml.dtm.ref.sax2dtm.SAX2DTM.dispatchCharactersEvents(SAX2DTM.java:557)
        62: at org.apache.xpath.axes.LocPathIterator.executeCharsToContentHandler(LocPathIterator.java:247)
        61: at org.apache.xalan.templates.ElemValueOf.execute(ElemValueOf.java:274)