JSR-173 Reference Implementation
I’ve been looking at the new streaming API for XML (JSR-173), I’ve been generally impressed but have found a bug in the reference implementation, here’s the details, using this test program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | import java.io.*; import javax.xml.stream.*; public class StaxWriterTest { static String nsURI = "http://ianp.org/nsURI"; static String nsPrefix = "a"; static int depth = 0; // Used to pretty print the output. static XMLStreamWriter w; public static void main(String[] args) { try { w.writeStartDocument(); indent(1); w.writeStartElement(nsURI, "root"); w.writeNamespace(nsPrefix, nsURI); indent(0); w.writeEmptyElement(nsURI, "levelOne"); w.writeAttribute(nsURI, "foo", "foo"); indent(0); w.writeStartElement(nsURI, "levelOne"); w.writeEndElement(); indent(1); w.writeStartElement(nsURI, "levelOne"); indent(1); w.writeEmptyElement(nsURI, "levelTwo"); w.writeAttribute(nsURI, "foo", "foo"); indent(-2); w.writeEndElement(); indent(0); w.writeStartElement(nsURI, "levelOne"); w.writeEndElement(); indent(-1); w.writeEndElement(); w.flush(); w.close(); } catch (Exception e) { e.printStackTrace(); System.exit(1); } } static void indent(int d) { try { if (d < 0) { depth += d; } for (int i = 0; i < depth; ++i) w.writeCharacters(" "); if (d > 0) { depth += d; } } catch (XMLStreamException e) { throw new RuntimeException(e); } } } |
This is using version 7 of the reference implementation, by the way. The program should produce this output:
1 2 3 4 5 6 7 8 9 | <?xml version='1.0' encoding='utf-8'?> <a:root xmlns:a="http://ianp.org/nsURI"> <a:levelOne a:foo="foo"/> <a:levelOne/></a:levelOne> <a:levelOne> <a:levelTwo a:foo="foo"/> </a:levelOne> <a:levelOne/></a:levelOne> </a:root> |
But actually produces this:
1 2 3 4 5 6 7 8 9 | <?xml version='1.0' encoding='utf-8'?> <a:root xmlns:a="http://ianp.org/nsURI"> <a:levelOne a:foo="foo"/> <a:levelOne/></a:levelOne> <a:levelOne/> <a:levelTwo a:foo="foo"/> </a:levelOne> <a:levelOne/></a:levelOne> </a:root> |
Line 5 is generated as an empty element instead of a start element. I’ve pointed this out the to JCP committee, we’ll see if they repsond.
