It can't be a data issue. The records are persisted via hibernate and work consistently as expected in pages. Like I said, I query the same table to which the abstract class is mapped in my index page with no problem at all. I also said that it works in the dispatcher for the first entity I query, but any subsequent query to a _different_ entity throws that exception. The query is also just a read (select). Any other ideas?
thanks Yunhua Sang wrote: > It sounds more like a data issue, check your data in database carefully. > > Yunhua > > On Wed, Jul 23, 2008 at 11:18 PM, Chris Lewis <[EMAIL PROTECTED]> wrote: > >> Hello, >> >> I have a dispatcher that uses a hibernate session. The dispatcher is >> auto bound and receives the session in the constructor. I'm using >> tapestry-hibernate so that session instance is a proxy that gets the >> real session for the current thread (right?). Now in testing my >> dispatcher, I give it a url like: >> >> /MyContext/?limg=2 >> >> The dispatcher looks for "limg" and if found, queries the session >> assuming that its value is the PK of a mapped entity. When I trigger the >> dispatcher for the first time it works fine. If I refresh the page, >> fine. If I change the value to something else, say 3, then it breaks >> with a org.hibernate.InstantiationException: >> >> Cannot instantiate abstract class or interface: com.mypackage.data.Listing >> >> If I change the value back to 2, the same thing happens! "Listing" is an >> abstract class mapped as a super class entity via: >> >> @Entity >> @Inheritance(strategy = InheritanceType.JOINED) >> >> Any clue what's going on here? Two things are perplexing me: >> >> 1) Querying mapped super classes is legal, and I in fact the same thing >> on my Index page with no problem. >> 2) The query works the first time, but as soon as the id changes it is >> forever broken until I restart the container. >> >> Thanks in advance! >> >> chris >> >> -- >> http://thegodcode.net >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: [EMAIL PROTECTED] >> For additional commands, e-mail: [EMAIL PROTECTED] >> >> >> > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > > -- http://thegodcode.net
