query from modeler trouble

From: Tore Halset (halse..vv.ntnu.no)
Date: Mon Oct 29 2007 - 04:23:06 EDT

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    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.checkDescriptorI
    nitialized(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.createSqlString
    (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.



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