MapViewer data source problem in the morning

Hi all,
I have the Oracle Application server 10g and Oracle database 10g installed on 2 different computers. On the application server I have installed MapViewer the last version.
I have defined a datasource in the configuration file and that works perfect.
My application uses mapviewer through java and displays the generated image in an jsp. The same working as the demos though.
Each night there is a backup of the database made on the other computer.
The MapViewer/data source remains open through the night. When I come to the office in the morning, and i try to access my webpage with the mapviewer image, I get an
500 Internal Server Error, java.lang.NullPointerException...
I check in the admin page of the map viewer the following:
<list_data_sources /> - The datasource is still defined
<data_source_exists data_source="blabla"/> - The datasource exists
If i try to <list_predefined_themes data_source="blabla" /> I get again an error. It seems that the connection with the database is not working.
If I <redefine_data_source ..> or <restart/> mapviewer everything starts to work again without problems.
I have attached further some erros I have in the log file, maybe it will help you to help me ;-)
Regards,
Adrian
Thu Feb 02 08:10:28 CET 2006 ERROR [oracle.sdovis.theme.pgtp] *** Exception while querying theme: LEVEL_1
Thu Feb 02 08:10:28 CET 2006 ERROR [oracle.sdovis.theme.pgtp] java.sql.SQLException: I/O-uitzondering: Connection reset by peer: socket write error
     at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:137)
Thu Feb 02 08:10:28 CET 2006 ERROR [oracle.sdovis.DBMapMaker] Message:Exception while querying theme: LEVEL_1
Description: Nested exception is:
java.sql.SQLException: I/O-uitzondering: Connection reset by peer: socket write error
java.sql.SQLException: I/O-uitzondering: Connection reset by peer: socket write error
     at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:137)
     at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:174)
     at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:286)
Thu Feb 02 08:10:28 CET 2006 WARN [oracle.sdovis.MapMaker] null MBR resulted from buildDataMBR.
Thu Feb 02 08:10:28 CET 2006 ERROR [oracle.lbs.mapserver.core.RealWorker] Message:[SDOVIS] No spatial data to render!
Description:
     at oracle.sdovis.DBMapMaker.renderEm(DBMapMaker.java:1304)
     at oracle.sdovis.MapMaker.renderMap(MapMaker.java:1399)
Thu Feb 02 08:10:28 CET 2006 ERROR [oracle.lbs.mapserver.core.RealWorker] Message:null
Thu Feb 02 08:10:28 CET 2006
Severity: 0
Description:
Message:[SDOVIS] No spatial data to render!
Description:
     at oracle.sdovis.DBMapMaker.renderEm(DBMapMaker.java:1304)
     at oracle.sdovis.MapMaker.renderMap(MapMaker.java:1399)
Thu Feb 02 08:12:45 CET 2006 ERROR [oracle.lbs.mapserver.core.MapperConfig] java.sql.SQLException: I/O-uitzondering: Connection reset by peer: socket write error
     at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:137)
     at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:174)

Hi,
please post how you did define the data source in the configuration file.
Thanks.

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