Hi,
According to
http://code.google.com/intl/de/appengine/docs/java/datastore/creatinggettinganddeletingdata.html#Keys
it is possible to set the primay keys yourself to a unique string.
When I use the code below this email however the hosted server gives
the following error
SEVERE: [1250461028948000] javax.servlet.ServletContext log: Exception
while dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method
'public abstract java.lang.String
org.haitsma.gwttest.client.GreetingService.greetServer
(java.lang.String)' threw an unexpected exception:
org.datanucleus.exceptions.NucleusUserException: The primary key for
org.haitsma.gwttest.client.Employee is an unencoded string but the key
of the corresponding entity in the datastore does not have a name.
You may want to either change the primary key to be an encoded string
(add the "gae.encoded-pk" extension), change the primary key to be of
type com.google.appengine.api.datastore.Key, or, if you're certain
that this class will never have a parent, change the primary key to be
of type Long.
What do I do wrong? Also when I add @Persistent annotation behind
@PrimaryKey I get the same error.
Thanks,
Jaap
Example code
----------
import java.util.Date;
import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.IdentityType;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Employee {
@PrimaryKey
private String name;
@Persistent
private Date hireDate;
public Employee(String name, Date hireDate) {
this.name = name;
this.hireDate = hireDate;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Date getHireDate() {
return hireDate;
}
public void setHireDate(Date hireDate) {
this.hireDate = hireDate;
}
}
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