Using example OAuth Calendar access example generates exceptions

[Robo]

I am trying to us OAuth for authenticating user access to Google
Calendars. I keep getting Run Time Exceptions in following Google
example:
http://code.google.com/p/gwt-google-apis/source/browse/trunk/apis/samples/calendar/?r=2019#calendar%2Fcom%2Fgoogle%2Fapi%2Fgwt%2Fsamples%2Fcalendar%2Fclient

The exceptions are:
1) java.lang.NoClassDefFoundError: org/json/JASONException

2) Caused by: java.lang.ClassNotFoundException: null

These exceptions happen at line 132 of CalendarEntryPoint.java in
method listEvents()

If the following code is commented out, the exceptions do not occur:
--------
calendar.events().list(calendarId)
.setTimeMin(today()).to(new Receiver<Events>() {
@Override
public void onSuccess(Events events) {
println("=== UPCOMING EVENTS ===");
for (Event event : events.getItems()) {
printLink(event.getSummary(), event.getHtmlLink());
}
}
@Override
public void onFailure(ServerFailure error) {
// TODO Auto-generated method stub
super.onFailure(error);
}
}).fire();

If someone can give me a clue of where to look I sure would be
thankful.

[Jason Hall]

I'm not sure how this is happening. org.json.JSONException should not be included in GWT code at all, since it's not GWT compatible. You are running this code in a GWT application, compiled into JS and run in a browser, or running in GWT's Hosted Mode, correct?

This sample code works for me, so please note any changes you've made to the code that may be causing this problem.

- Jason

[Robert Owens]

Hi Jason,

Thank you very much for getting back to me.
The only lines of code I changed are:
    the CLIENT_ID and API_KEY for which I generated ones for me
    listEvents() I put a try / catch clause around the     calendar.events().list(calendarId)
    plus added a onFailure callback for same code segment.
Reason for above changes was to get around or find more about the exceptions noted before.
I looked at the import statements and the project configuration.

I am running the application in Eclipse IDE as a Google Web Application.

The following are the Jar files that are in the project path and the war.WEB-INF.lib directory:

gwt-plus-v1-0.2-alpha.jar
gwt-google-apis.jar
gwt-calendar-v3-0.2-alpha.jar
appengine-api-1.0-sdk-1.6.1.jar
appengine-api-labs-1.6.1.jar
appengine-jsr107cache-1.6.1.jar
datanucleus-appengine-1.0.10.final.jar
datanucleus-core-1.1.5.jar
datanucleus-jpa-1.1.5.jar
geronimo-jpa_3.0_spec-1.1.1.jar
geronimo-jta_1.1_spec-1.1.1.jar
google_sql.jar
jdo2-api-2.3-eb.jar
jsr107cache-1.1.jar
gwt-servlet.jar

I am using Galeo Eclipse IDE and have gotten various other GWT projects or code sets working. Any suggestions to get me on the right track are very welcome.
Thank you