I have a strange problem. I get an error from Google Web Toolkit stating the following:

```
com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract 
com.pluspopularity.model.LinkItem com.pluspopularity.web.client.GreetingService.greetServer(java.lang.String) 
throws java.lang.IllegalArgumentException' threw an unexpected exception: 
java.lang.NoClassDefFoundError: org/json/JSONException

```

Now, I can find lots of questions about this `java.lang.NoClassDefFoundError: org/json/JSONException` exception, but they all seem to be fixed by GWT version 2.5 because `org.json` was since then included in the `gwt-dev.jar` package.

I have version 2.5 and I can see `org.json` in my GWT SDK library.

So I have no idea where this error comes from.

Something I noticed: the GWT SDK folder contains a lot of jar files, but only 4 are included when I add it as an SDK in Eclipse: `gwt-user.jar`, `gwt-dev.jar`, `validation-api-1.0.0.GA-sources.jar` and `validation-api-1.0.0.GA.jar`. In some issues in questions about this error from GWT versions before 2.5 I see mentions of a `gwt-servlet-deps.jar` file. That file sits inside my GWT SDK folder, but it's not included in the SDK library in Eclipse.
I re-installed the GWT SDK via Eclipse but still only those 4 files are included.