I'm validating some XML files against
Schematron stylesheets by using
Probatron4j, which uses Saxon internally. Most of the time, this works fine, but occasionally, processing crashes with the error\[quote\] org.xml.sax.SAXParseException: Invalid byte 1 of 1-byte UTF-8 sequence.\[/quote\]My research has shown that this message typically indicates (in no particular order)
- blatantly invalid data (e.g. attempting to read a ZIP file as if it were an XML file);
- the presence of byte order marks;
- the presence of characters that are not legal in UTF-8; or
- a document that is lying when it claims to be UTF-8-encoded.
None of these applies to the document I'm processing. I've inspected the input in byte array form during program execution, and it doesn't contain a BOM or any non-ASCII characters.Processing gets about a fifth of the way through my 30kb doc before crashing on an unremarkable English sentence (by "unremarkable," I mean that all bytes are between 32 (space) and 122 (lowercase z); in other words, standard keyboard characters). Here's the supposedly offending element:\[code\][60, 80, 97, 114, 97, 103, 114, 97, 112, 104, 62, 69, 120, 101, 99, 117, 116, 105, 118, 101, 32, 83, 117, 109, 109, 97, 114, 121, 58, 32, 70, 114, 111, 109, 32, 49, 55, 53, 52, 32, 116, 111, 32, 49, 55, 54, 51, 13, 10, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 69, 117, 114, 111, 112, 101, 32, 97, 110, 100, 32, 116, 104, 101, 32, 65, 109, 101, 114, 105, 99, 97, 115, 32, 119, 101, 114, 101, 32, 99, 97, 117, 103, 104, 116, 32, 117, 112, 32, 105, 110, 32, 97, 32, 99, 111, 110, 102, 108, 105, 99, 116, 32, 98, 101, 116, 119, 101, 101, 110, 32, 69, 110, 103, 108, 97, 110, 100, 44, 32, 117, 110, 100, 101, 114, 32, 75, 105, 110, 103, 32, 71, 101, 111, 114, 103, 101, 32, 73, 73, 44, 32, 97, ...\[/code\]Oddly, the failing document was generated by removing a few elements from a larger document that gets processed cleanly by the same code.I know that the exception is being thrown in the \[code\]parse(InputSource input)\[/code\] method of an object that implements the \[code\]org.xml.saxXMLReader\[/code\] interface. According to
the Javadoc, \[code\]SAXException\[/code\] indicates\[quote\] Any SAX exception, possibly wrapping another exception.\[/quote\]Examining the exception in a debugger shows that there is no wrapped exception.What could be causing this error?
