I'm don't know appengine, but if you want update something you must do in a transaction scope. See Jpa transactions<http://en.wikibooks.org/wiki/Java_Persistence/Transactions>
Juan 2011/3/31 Marcin Misiewicz <[email protected]> > Hi Juan > > 1. I added @Basic annotation with fetch type eager and it works. Till now I > was pretty sure that embedded object are always fetched and I thought that > this problem is related to the appengine. > > 2. Here is my persistence.xml file. Do you suggest that I should use > transactions to get it working ? I'm using appengine for the first time and > this app is actually testing app, I'm testing the new api Editors, RF. > That's why i don't know much about appengine and its datastore. > > <?xml version="1.0" encoding="UTF-8" standalone="no"?> > <persistence xmlns="http://java.sun.com/xml/ns/persistence"; > xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; version="1.0" > xsi:schemaLocation="http://java.sun.com/xml/ns/persistence > http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd";> > <persistence-unit name="transactions-optional"> > > <provider>org.datanucleus.store.appengine.jpa.DatastorePersistenceProvider</provider> > <properties> > <property name="datanucleus.NontransactionalRead" value="true" /> > <property name="datanucleus.NontransactionalWrite" value="true" /> > <property name="datanucleus.ConnectionURL" value="appengine" /> > </properties> > </persistence-unit> > </persistence> > > -- > You received this message because you are subscribed to the Google Groups > "Google Web Toolkit" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/google-web-toolkit?hl=en. > -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
