I get the following error:
Exception in thread \"main\" java.lang.NoSuchMethodError: com.google.common.collect.ImmutableSet.of([Ljava/lang/Object;)Lcom/googl
Issue with latest version of gdata still referencing older guava methods
Check Out http://code.google.com/p/gdata-java-client/issues/detail?can=2&start=0&num=100&q=&colspec=ID%20Type%20Status%20Priority%20Milestone%20Owner%20Summary&groupby=&sort=&id=344
Solution
I switched to guava-r07.jar located at http://code.google.com/p/guava-libraries/downloads/detail?name=guava-r07.zip&can=4&q=
This got me past ContactsService service = new ContactsService("");
Jar's in use:
guava-r07.jar
Apache (servlet-api.jar)