MalformedInputException when calling HttpServletRequest.getReader() within a servlet for JBoss EAP

Issue

Using an HTTP client an XML document with a character encoding of ISO-8859-1 is posted to a servlet running on JBoss EAP. The XML document has a Ñ (special character) in it.

The following error is shown in the server.log:

java.nio.charset.MalformedInputException: Input length = 1
        at java.nio.charset.CoderResult.throwException(CoderResult.java:260)
        at org.apache.tomcat.util.buf.B2CConverter.convert(B2CConverter.java:117)
        at org.apache.catalina.connector.InputBuffer.realReadChars(InputBuffer.java:404)
        at org.apache.tomcat.util.buf.CharChunk.substract(CharChunk.java:383)
        at org.apache.catalina.connector.InputBuffer.read(InputBuffer.java:417)
        at org.apache.catalina.connector.CoyoteReader.read(CoyoteReader.java:93)