Jörg,
Thank you for your insight. Jettison 1.2 was really the only version I had
not tried but it seems to work with that version (with XStream 1.4.4). It
does *not* work with 1.0.1, 1.1, 1.3.3 (the last one was expected). Thanks
again!
Michael
On Tue, Feb 4, 2014 at 4:32 AM, Jörg Schaible
<joerg.schai...@swisspost.com>wrote:
> Hi Michael,
>
> Michael Minella wrote:
>
> > I'm running into an issue performing a round trip serializing then
> > deserializing an object that contains an empty array of Properties. I've
> > created a small test case below that illustrates the issue. It seems to
> > work fine when going to XML (using the DomDriver), but not JSON (using
> > the JettisonMappedXmlDriver). Do I need to create a custom converter for
> > this, is this a bug, or am I just missing something. Any insight that
> can
> > be provided is appreciated. Thanks in advance!
>
> This works for me (the array type does not matter):
>
> ============= %< =============
> public void testEmptyArray()
> {
> xstream.alias("exception", Exception.class);
> Exception[] exceptions = new Exception[3];
> String json = xstream.toXML(exceptions);
> assertEquals(
> "{'exception-array':[{'null':['','','']}]}".replace('\'', '"'),
> json);
> Exception[] exceptions2 = (Exception[])xstream.fromXML(json);
> assertEquals(json, xstream.toXML(exceptions2));
> }
> ============= %< =============
>
> Note, that I am using Jettison 1.2, newer versions are no longer
> compatible:
> - http://xstream.codehaus.org/download.html#optional-deps
> - http://xstream.codehaus.org/faq.html#JSON_Jettison_version
> - http://jira.codehaus.org/browse/JETTISON-111
>
> Remember, XStream writes here into a StAX interface i.e. from its PoV this
> is plain XML. Jettison is responsible for turning this XML into JSON
> representation (and vice versa). Therefore you should be aware that you get
> a different JSON representation if the Properties instance contain one ore
> more elements (look at the nesting level):
>
> ============= %< =============
> public void testProperties()
> {
> Properties properties = new Properties();
> properties.setProperty("key.1", "Value 1");
> String json = xstream.toXML(properties);
> assertEquals("{'properties':[{'property':{'@name
> ':'key.1','@value':'Value
> 1'}}]}".replace('\'', '"'), json);
> Properties properties2 = (Properties)xstream.fromXML(json);
> assertEquals(json, xstream.toXML(properties2));
>
> properties.setProperty("key.2", "Value 2");
> json = xstream.toXML(properties);
> assertEquals("{'properties':[{'property':
> [{'@name':'key.2','@value':'Value 2'},{'@name':'key.1','@value':'Value
> 1'}]}]}".replace('\'', '"'), json);
> properties2 = (Properties)xstream.fromXML(json);
> assertEquals(json, xstream.toXML(properties2));
> }
> ============= %< =============
>
> You get best results with simple objects and plain lists/arrays, the
> conversion to and from JSON *is* limited, see word of warning:
>
> - http://xstream.codehaus.org/json-tutorial.html
>
> Cheers,
> Jörg
>
>
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