Hi
In our project we have tried using inheritance, this is the
simplification of the map we are using:
<db-entity name="AbstractNode">
<db-attribute name="id" type="INTEGER" isPrimaryKey="true"
isMandatory="true"/>
<db-attribute name="isDeleted" type="BOOLEAN"/>
<db-attribute name="modifiedOn" type="TIMESTAMP"/>
<db-attribute name="name" type="VARCHAR" length="512"/>
<db-attribute name="nodeType" type="VARCHAR" length="128"/>
</db-entity>
<obj-entity name="AbstractNode"
className="ish.oncourse.server.cayenne.AbstractNode"
clientClassName="ish.oncourse.cayenne.AbstractNode" lock-
type="optimistic" dbEntityName="AbstractNode"
superClassName="ish.oncourse.server.cayenne.glue.CayenneDataObject"
clientSuperClassName="ish.oncourse.cayenne.glue.PersistentObject">
<qualifier><![CDATA[(isDeleted = null) or (isDeleted = 0)]]></
qualifier>
<obj-attribute name="isDeleted" type="java.lang.Boolean" db-
attribute-path="isDeleted"/>
<obj-attribute name="modifiedOn" type="java.util.Date" db-attribute-
path="modifiedOn"/>
<obj-attribute name="name" type="java.lang.String" db-attribute-
path="name"/>
<obj-attribute name="nodeType" type="java.lang.String" db-attribute-
path="nodeType"/>
</obj-entity>
<obj-entity name="DefaultNode" superEntityName="AbstractNode"
className="ish.oncourse.server.cayenne. DefaultNode"
clientClassName="ish.oncourse.cayenne. DefaultNode" lock-
type="optimistic">
<qualifier><![CDATA[nodeType = "D"]]></qualifier>
</obj-entity>
committing new objects works ok, but fetching the objects does not
work (the presence of qualifier in DefaultNode does not matter):
getContext().performQuery(new SelectQuery(Term.class)) throws
exception on server which does not tell much:
17/04/2007 19:05:31 com.caucho.hessian.server.HessianSkeleton invoke
WARNING: org.apache.cayenne.CayenneRuntimeException: [v.$
{project.version} ${project.build.date} ${project.build.time}]
Exception processing message org.apache.cayenne.remote.QueryMessage
org.apache.cayenne.CayenneRuntimeException: [v.${project.version} $
{project.build.date} ${project.build.time}] Exception processing
message org.apache.cayenne.remote.QueryMessage
at
org.apache.cayenne.remote.service.BaseRemoteService.processMessage
(BaseRemoteService.java:169)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke
(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.caucho.hessian.server.HessianSkeleton.invoke
(HessianSkeleton.java:157)
at com.caucho.hessian.server.HessianServlet.service
(HessianServlet.java:365)
at ish.oncourse.server.CayenneServlet.service
(CayenneServlet.java:102)
at org.mortbay.jetty.servlet.ServletHolder.handle
(ServletHolder.java:428)
at org.mortbay.jetty.servlet.ServletHandler.dispatch
(ServletHandler.java:677)
at org.mortbay.jetty.servlet.ServletHandler.handle
(ServletHandler.java:568)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1530)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1482)
at org.mortbay.http.HttpServer.service(HttpServer.java:909)
at org.mortbay.http.HttpConnection.service
(HttpConnection.java:820)
at org.mortbay.http.HttpConnection.handleNext
(HttpConnection.java:986)
at org.mortbay.http.HttpConnection.handle
(HttpConnection.java:837)
at org.mortbay.http.SocketListener.handleConnection
(SocketListener.java:245)
at org.mortbay.util.ThreadedServer.handle
(ThreadedServer.java:357)
at org.mortbay.util.ThreadPool$PoolThread.run
(ThreadPool.java:534)
Is the inheritance functionality is supposed to work with remote
persistence ? Maybe there is an error in our code ?
Marcin
