Hello ivanceras,

YOUR PROPERTY "datanucleus.ConnectionURL"
-----------------------------------------
I do not know what your dev environment is. I use NetBeans; this has a
connection set up to use my local MySQL database. I noticed an extra
"//" between the "jdbc:" and "mysql" parts of your connection URL. But
you might need this for your environment. You might want to verify
your value for this property.


YOUR PROPERTY "datanucleus.storeManagerType"
--------------------------------------------
I personally do not use this property. As you will probably know, the
relevant DataNucleus documentation describes this property as:

'Type of the StoreManager to use for this PMF/EMF. This has typical
values of "rdbms", "db4o". If it isn't specified then it falls back to
trying to find the StoreManager from the connection URL. The
associated DataNucleus plugin has to be in the CLASSPATH when
selecting this. When using data sources (as usually done in a JavaEE
container), DataNucleus cannot find out the correct type automatically
and this option must be set.'

I assume that your set-up requires this property (otherwise I would
suggest omitting it as I do). All I can suggest here is to verify that
you have the relevant DataNucleus plug-in and that it can be found
from your class path. I do not speak from experience about this
property since I have never used it.

Don't make the mistake I have made: ensure that you use the same
DataNucleus plug-in version number as is used by the version of GAE
that you use!


Cheers,

Ian
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