multiple entity groups in a transaction

[peter]

there are some transaction options which suggest that you can begin a transaction allowing more than one entity group

but with sdk 1.5.3 on windows the beginTransaction() method does not compile with a TransactionOption parameter

[Robert Kluin]

Transactions are currently limited to a single entity group.
http://code.google.com/appengine/docs/java/datastore/transactions.html#What_Can_Be_Done_In_a_Transaction

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[peter]

so why does the documentation refer to  begintransaction(transactionoptions)

why does transactionoptions have a method allowmultipleentitygroups

[Tim Hoffman]

Often things appear in the SDK well before they appear in real life.

Have a look at appengine.api.search for instance.  Why is the api there, but I can't use it ;-)

Rgds

T