the problem is simple:
@Entity
public class Company implements Serializable {
// ...
public Company(String irsEIN) {
ein = irsEIN;
// ...
}
@Id String ein; // the IRS EIN for the company ... this is a
unique id and a good one to use for PK?
// ...
}
... no it isn't because you get an exception when you commit one of
these suckers:
WARNING: java.lang.IllegalArgumentException: Name may not start with a
digit.
at com.google.appengine.api.datastore.Key.<init>(Key.java:112)
at com.google.appengine.api.datastore.Key.<init>(Key.java:89)
at com.google.appengine.api.datastore.KeyFactory.createKey
(KeyFactory.java:72)
at com.google.appengine.api.datastore.KeyFactory.createKey
(KeyFactory.java:57)
at com.google.appengine.api.datastore.Entity.<init>(Entity.java:114)
at
org.datanucleus.store.appengine.DatastoreFieldManager.storeStringPKField
(DatastoreFieldManager.java:511)
at
org.datanucleus.store.appengine.DatastoreFieldManager.storeStringField
(DatastoreFieldManager.java:421)
at org.datanucleus.state.AbstractStateManager.providedStringField
(AbstractStateManager.java:1023)
at com.charityblossom.dao.entities.Charity.jdoProvideField
(Charity.java)
at com.charityblossom.dao.entities.Charity.jdoProvideFields
(Charity.java)
at org.datanucleus.state.JDOStateManagerImpl.provideFields
(JDOStateManagerImpl.java:2715)
at
org.datanucleus.store.appengine.DatastorePersistenceHandler.insertObject
(DatastorePersistenceHandler.java:180)
at org.datanucleus.state.JDOStateManagerImpl.internalMakePersistent
(JDOStateManagerImpl.java:3185)
at org.datanucleus.state.JDOStateManagerImpl.flush
(JDOStateManagerImpl.java:4513)
at org.datanucleus.ObjectManagerImpl.flushInternal
(ObjectManagerImpl.java:2814)
at org.datanucleus.ObjectManagerImpl.flush(ObjectManagerImpl.java:
2754)
at org.datanucleus.ObjectManagerImpl.preCommit(ObjectManagerImpl.java:
2893)
at org.datanucleus.TransactionImpl.internalPreCommit
(TransactionImpl.java:369)
at org.datanucleus.TransactionImpl.commit(TransactionImpl.java:256)
at org.datanucleus.jpa.EntityTransactionImpl.commit
(EntityTransactionImpl.java:104)
...
So, you think, "no problem I actually want it as a number anyway..."
so you change the code like so:
@Entity
public class Company implements Serializable {
// ...
public Company(Long irsEIN) {
ein = irsEIN;
// ...
}
@Id Long ein; // the IRS EIN for the company ... this is a unique
id and a good one to use for PK?
// ...
}
Problem solved? ....
WARNING: javax.persistence.PersistenceException: Attempt was made to
manually set the id component of a Key primary key. If you want to
control the value of the primary key, set the name component instead.
at
org.datanucleus.jpa.NucleusJPAHelper.getJPAExceptionForNucleusException
(NucleusJPAHelper.java:264)
at org.datanucleus.jpa.EntityTransactionImpl.commit
(EntityTransactionImpl.java:122)
Nope! ...
Now I want to use JPA because I want my code to be portable, so I
really dont want to care about JDO,
DataNucleus or the App Engine Datastore ...
This exception error message is meaningless to me ... even after
reading the App Engine and DataNucleus
documentation ...
Also, on a slightly related issue, should I have to obtain an
EntityManager transaction for each instance
of this class I wish to persist?
I'd appreciate any suggestions anyone might have?
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