I spent much of yesterday moving an old GWT project from Ant to Maven. Much
of that time was spent running down a serious discrepancy in the
server-side conversion of XML to JSON, specifically the call
org.json.XML*.*toJSONObject(java.lang.String
string). (I'm thinking this needs to be filed as an issue.)
The project was originally built with Ant. Following the build.xml in the
GWT samples, it had gwt-dev.jar in the project classpath (see, for example,
Showcase's build.xml). When run in devmode, this version of JSON will
convert
<width>448</width>
<height>293</height>
to
{"height":"293", "width":"448"}
When this arrives at the client-side, in terms of the
com.google.gwt.json.client package we have a JSONString vs. a JSONNumber.
In my Maven build, the pom.xml declares dependencies only on
gwt-servlet.jar and gwt-user.jar, neither of which includes org.json
(though gwt-servlet-deps.jar has the same org.json as gwt-dev.jar). JSON is
being provided by json-20090211.jar from mavenrepository.com. Now that same
XML converts to
{"height":293, "width":448}
JSONNumber vs JSONString! This makes a *huge* difference in how the data is
handled:
JSONString: int width = Integer.parseInt(jsonObject.get("width
").isString().stringValue());
JSONNumber: int width = (int)jsonObject.get("width"
).isNumber().doubleValue();
Use the wrong one and an exception is thrown.
I think that json-20090211.jar is the correct approach. Certainly AutoBean
would fail if it got a string vs a number for an integer field (or maybe
just a zero value?).
One can get the same results with the Ant in devmode by removing <fileset
dir="${gwt.sdk}" includes="gwt-dev*.jar"/> from project.class.path and
adding it only to the gwtc and devmode targets (and any target using
GWTTestCase). However I think that GWT should be brought in line with
json-20090211.jar. (Looking at the tools directory for building GWT, it
seems the JSON used (r2_20080312) is not a version available from
mavenrepository.com.)
Has anyone else seen this? I don't see an issue filed on it. I'm happy to
put one in, but I thought I'd raise it here first.
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