concerning the hint to use "sapjarfinder.com" - this is really the wrong way to go. If you need the class for build-time issues, you'll need a copy of the JAR locally (through a locally deployed server or just as a copy of the JARs from some server in your company). And having these at hand, one definitely should use ClassLocator, as this directly extends the .classpath file.
Using "sapjarfinder.com" just means you don't know way to got... A short introduction for ClassLocator can be found here:
As Detlev mentioned , read the Blog and apply , better way to find the required jar files , if not this for this application , it would be a better solution for any other application.
By that you can find whether NWDS has the required jar file for your application or not, if not you need to get from third party .
Also , the primary steps for mobile application , once please check also the following :
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