Switch on String shouldn't this work in GWT 2.6 / Java 7 ?

Something like ;

switch (book) {

case "Harry Potter":

break;

case "Hitch Hikers Guide To The Galaxy":

break; 

Should now work with the latest GWT from here;
https://code.google.com/p/google-web-toolkit/downloads/list

Correct?

Because I am still getting a "   [ERROR] Line 1971: Cannot switch on a value of type String. Only convertible int values or enum constants are permitted "

error.
Screenshot;

Have I somehow setup GWT 2.6 wrongly?

Thanks,

-Thomas

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