I'd say clone a DataMap (e.g. via XML, although
Util.cloneViaSerialization() would likely also work). And then
replace Java class for all cloned entities to be CayenneDataObject.
This should be MUCH less painful than creating real Java classes on
the fly.
Andrus
On Oct 29, 2007, at 10:23 AM, Tore Halset wrote:
Hello.
I am trying to issue a query from the modeler to the projects
DataMap and a selected DataSource. I am stumbling and need some help..
Here is my current problematic stack trace from issuing a *data
rows* SelectQuery on an entity called "MyEntity".
Caused by: java.lang.ClassNotFoundException: myapp.data.MyEntity
at java.lang.Class.forName(Class.java:242)
at org.apache.cayenne.util.Util.getJavaClass(Util.java:570)
at org.apache.cayenne.map.ObjEntity.getJavaClass(ObjEntity.java:256)
at
org.apache.cayenne.reflect.PersistentDescriptorFactory.getDescriptor
(PersistentDescriptorFactory.java:50)
at org.apache.cayenne.reflect.ClassDescriptorMap.createDescriptor
(ClassDescriptorMap.java:128)
at
org.apache.cayenne.reflect.LazyClassDescriptorDecorator.checkDescripto
rInitialized(LazyClassDescriptorDecorator.java:49)
at
org.apache.cayenne.reflect.LazyClassDescriptorDecorator.getEntity
(LazyClassDescriptorDecorator.java:73)
at
org.apache.cayenne.access.trans.SelectTranslator.appendQueryColumns
(SelectTranslator.java:357)
at
org.apache.cayenne.access.trans.SelectTranslator.buildResultColumns
(SelectTranslator.java:332)
at org.apache.cayenne.access.trans.SelectTranslator.createSqlString
(SelectTranslator.java:107)
at
org.apache.cayenne.dba.postgres.PostgresSelectTranslator.createSqlStri
ng(PostgresSelectTranslator.java:31)
at org.apache.cayenne.access.trans.QueryAssembler.createStatement
(QueryAssembler.java:95)
at org.apache.cayenne.access.jdbc.SelectAction.performAction
(SelectAction.java:71)
at org.apache.cayenne.access.DataNodeQueryAction.runQuery
(DataNodeQueryAction.java:57)
at org.apache.cayenne.access.DataNode.performQueries(DataNode.java:
236)
So the problem is that myapp.data.MyEntity does not exist. Is there
some smart trick to duplicate the model and make all ObjEntities
generic? Or perhaps generate and load the classes in a disposable
client class loader?
Regards,
- Tore.
