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Re: Backup/Restore bug

On Fri, 02 Mar 2001, Jörg Prante wrote:
> Hi,
> 
> I try to backup an Ozone database, but I can't restore it.
> 
> The reason is that a hash object with subclasses ( Hashtable, 
> HashMap, DxHashMap, whatever) cannot be re-instantiated during restore.

The problem is that Hashtable (and some other collection classes) are using
inner classes. Unfortunately we didn't find a way to reconstruct inner classes
via reflection.

However, there _is_ a workaround for Hashtable (can be easily extended for
other classes). So Hashtable and DxHashMap, which is based on Hashtable)
_should_ work. Rolf wrote this code. Maybe he known what's going on here?


Falko

> 
> Here is a log of a try with a HashMap:
> 
> --------snip---------
> [info] (833) InvokeServer: connection established...
> [info] (286) InvokeServer: user logged in: joerg
> [info] (286) BackupRestore: beginRestore()...
> 
> [info] (286) BackupRestore: processRestoreChunk(): size=8710
> handleValueObjStartElement: java.lang.InstantiationException: 
> java.util.HashMap$Entry
> handleMemberEndElement: java.lang.NoSuchFieldException
> handleMemberEndElement: java.lang.NoSuchFieldException
> handleMemberEndElement: java.lang.NoSuchFieldException
> handleValueObjStartElement: java.lang.InstantiationException: 
> 
> [message repeats]
> --------snip---------
> 
> I even tried a customized class 'UserProp', but restore fails with:
> 
> --------snip---------
> [info] (833) InvokeServer: connection established...
> [info] (816) InvokeServer: user logged in: joerg
> [info] (816) ClusterStore: loadCluster(): load cluster from disk: 101
> [info] (816) BackupRestore: beginRestore()...
> 
> [info] (816) BackupRestore: processRestoreChunk(): size=6110
> handleValueObjStartElement: java.lang.InstantiationException: 
> com.sevenval.fit.user.ozone.UserProp
> handleMemberEndElement: java.lang.NoSuchFieldException
> handleMemberEndElement: java.lang.NoSuchFieldException
> 
> [message repeats]
> --------snip---------
> 
> Jörg
> 
> -- 
> Jörg Prante
> Sevenval AG (HRB 32757) e-business marketing technologies
> D-50667 Köln . Alter Markt 36-42
> Fon +49 221 65007-0 . Fax 4249891
> http://www.sevenval.de . joerg@7val.com
-- 
______________________________________________________________________
Falko Braeutigam                              mailto:falko@smb-tec.com
SMB GmbH                                        http://www.smb-tec.com