The datastore can store lists of basic types as a List but cannot
store lists of lists. All collection types are converted to lists
when they are stored.
On 7 Aug 2010, at 09:28, slowpoison wrote:
I have a persistent class defined as follows
@PersistenceCapable
public class A {
...
@Persistent
List<LinkedHashSet<String>> setList;
...
}
When I try to make an object of this type persistent, I get the
following exception:
java.util.LinkedHashSet is not a supported property type.
at
com
.google
.appengine
.api
.datastore.DataTypeUtils.checkSupportedSingleValue(DataTypeUtils.java:
184)
at
com
.google
.appengine
.api.datastore.DataTypeUtils.checkSupportedValue(DataTypeUtils.java:
149)
at
com
.google
.appengine
.api.datastore.DataTypeUtils.checkSupportedValue(DataTypeUtils.java:
123)
at com.google.appengine.api.datastore.Entity.setProperty(Entity.java:
280)
at
org
.datanucleus
.store
.appengine
.DatastoreFieldManager.storeObjectField(DatastoreFieldManager.java:
843)
at
org
.datanucleus
.state
.AbstractStateManager.providedObjectField(AbstractStateManager.java:
1037)
...
Any clue, what's going wrong?
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