I have tried to follow the documentation at
http://code.google.com/intl/de-DE/appengine/docs/java/datastore/creatinggettinganddeletingdata.html
but no matter what I try, I always get an error/an exception of
different kinds.
Already the simplest attempt comes up with an error. That's what i
have:
- - - - -
public class Person {
@Id
private String id;
- - - - -
...
person.setId("stsch");
<<<EntityManager>>>.persist(person);
...
- - - - -
==>
java.lang.IllegalArgumentException: Cannot parse: stsch===
at
com.google.appengine.api.datastore.KeyFactory.stringToKey(KeyFactory.java:
192)
at
org.datanucleus.store.appengine.DatastoreRelationFieldManager.checkForParentSwitch(DatastoreRelationFieldManager.java:
201)
at
org.datanucleus.store.appengine.DatastoreFKListStoreSpecialization.updateElementFk(DatastoreFKListStoreSpecialization.java:
94)
at
org.datanucleus.store.mapped.scostore.FKListStore.updateElementFk(FKListStore.java:
254)
...
Caused by:
com.google.appengine.repackaged.com.google.common.util.Base64DecoderException:
invalid padding byte '=' at byte offset 5
at
com.google.appengine.repackaged.com.google.common.util.Base64.decode(Base64.java:
529)
at
com.google.appengine.repackaged.com.google.common.util.Base64.decodeWebSafe(Base64.java:
493)
at
com.google.appengine.api.datastore.KeyFactory.stringToKey(KeyFactory.java:
190)
What is necessary to use a String as Primary Key?
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