The following works:
public Date getDate() {
return date;
}
and produces something like:
<date>2010-03-23T17:43:50.879Z</date>
And I can use an XmlGregorianCalendar to return xsd:date or xsd:time types fine:
@XmlSchemaType(name="date")
public XmlGregorianCalendar getDate() {
return date;
}
which produces something like:
<date>2010-03-23</date>
But trying to return xsd:datetime like so:
@XmlSchemaType(name="datetime")
public XmlGregorianCalendar getDate() {
return date;
}
Causes this stack trace:
java.lang.NullPointerException
at com.sun.xml.bind.v2.model.impl.RuntimeBuiltinLeafInfoImpl.checkXmlGregorianCalendarFieldRef(RuntimeBuiltinLeafInfoImpl.java:864)
at com.sun.xml.bind.v2.model.impl.RuntimeBuiltinLeafInfoImpl.access$200(RuntimeBuiltinLeafInfoImpl.java:111)
at com.sun.xml.bind.v2.model.impl.RuntimeBuiltinLeafInfoImpl$13.print(RuntimeBuiltinLeafInfoImpl.java:536)
...snip...
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)
Which doesn't mention my code at all.
I'm using tomcat 6.0.24, java 1.6.0_16-b01
Well I found the basic problem: It should be "dateTime"
not "datetime"
, however there are a number of deeper aspects to this.
First, the trace gave me very little in the way of help, and it took me a while to find the right source (jaxb-ri-2_2.src.zip). Line 864 is this:
int bitField = xmlGregorianCalendarFieldRef.get(type);
and xmlGregorianCalendarFieldRef
is defined as:
private static final Map<QName, Integer> xmlGregorianCalendarFieldRef =
new HashMap<QName, Integer>();
static {
Map<QName, Integer> f = xmlGregorianCalendarFieldRef;
f.put(DatatypeConstants.DATETIME, 0x1111111);
f.put(DatatypeConstants.DATE, 0x1111000);
f.put(DatatypeConstants.TIME, 0x1000111);
f.put(DatatypeConstants.GDAY, 0x1001000);
f.put(DatatypeConstants.GMONTH, 0x1010000);
f.put(DatatypeConstants.GYEAR, 0x1100000);
f.put(DatatypeConstants.GYEARMONTH, 0x1110000);
f.put(DatatypeConstants.GMONTHDAY, 0x1011000);
}
So xmlGregorianCalendarFieldRef
can't itself be null, but if get()
is called with a key which isn't present in the map, it will return null, and the NullPointerException
will be thrown when the JVM tries to unbox it.
This code is a bit sloppy; the type value isn't checked, which is why we get this rather cryptic message.
Obviously I then looked up the value of DatatypeConstants.DATETIME
and found the case error.
It also leads me to believe I should probably use something like:
@XmlSchemaType(name=DatatypeConstants.DATETIME)
public XmlGregorianCalendar getDate() {
return date;
}
For added protection, but that constant is a QName
not a string.
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