Object reference not set to an instance of an object.

Object reference not set to an instance of an object.

Postby John » Mon 07 Mar 2005 19:17

Hi;

We are experiencing an intermittent exception "object reference not set to an instance of an object" that is thrown by OraDirect .NET (v2.5) when our our C# (.NET v1.1) application makes stored procedure calls to our Oracle 8i database. We were unable to find any problems with our application or with the stored procedure. After running a stack trace on the exception we are led to believe that the problem is in the OraDirect driver. I have included the stack track below. I would greatly appreciate any help.

Thanks!


John


Stack Trace =
at DynamicType.nativeOCIEnvCreate(IntPtr& , UInt32 , IntPtr , IntPtr , IntPtr , IntPtr , UInt32 , UInt32 )
at DynamicType.OCIEnvCreate(IntPtr& , UInt32 , IntPtr , IntPtr , IntPtr , IntPtr , UInt32 , UInt32 )
at a.c.q.l()
at a.c.q..ctor(Boolean A_0, Boolean A_1, Boolean A_2)
at a.c.d..ctor(i A_0)
at a.c.k.a(DbConnectionOptions A_0, Object A_1, DbConnectionBase A_2)
at CoreLab.Common.DbConnectionFactory.a(DbConnectionBase A_0, DbConnectionOptions A_1)
at CoreLab.Common.DbConnectionFactory.a(DbConnectionBase A_0)
at CoreLab.Common.DbConnectionClosed.Open(DbConnectionBase outerConnection)
at CoreLab.Common.DbConnectionBase.Open()
at CoreLab.Oracle.OracleConnection.Open()
John
 
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Joined: Fri 12 Nov 2004 21:18
Location: Durham, NC, USA

Object reference not set to an instance of an object.

Postby John » Mon 07 Mar 2005 19:20

I have also seen the following stack trace for the same error.

Stack Trace =
at a.c.d.g()
at a.c.d..ctor(i A_0)
at a.c.k.a(DbConnectionOptions A_0, Object A_1, DbConnectionBase A_2)
at CoreLab.Common.DbConnectionFactory.a(DbConnectionBase A_0, DbConnectionOptions A_1)
at CoreLab.Common.DbConnectionFactory.a(DbConnectionBase A_0)
at CoreLab.Common.DbConnectionClosed.Open(DbConnectionBase outerConnection)
at CoreLab.Common.DbConnectionBase.Open()
at CoreLab.Oracle.OracleConnection.Open()
John
 
Posts: 25
Joined: Fri 12 Nov 2004 21:18
Location: Durham, NC, USA

Object reference not set to an instance of an object.

Postby John » Wed 09 Mar 2005 14:05

Another (slightly different) stack trace for the same error.

Stack Trace =
at DynamicType.nativeOCIHandleFree(HandleRef , UInt32 )
at DynamicType.OCIHandleFree(HandleRef , UInt32 )
at a.c.q.f()
at a.c.d..ctor(i A_0)
at a.c.k.a(DbConnectionOptions A_0, Object A_1, DbConnectionBase A_2)
at CoreLab.Common.DbConnectionFactory.a(DbConnectionBase A_0, DbConnectionOptions A_1)
at CoreLab.Common.DbConnectionFactory.a(DbConnectionBase A_0)
at CoreLab.Common.DbConnectionClosed.Open(DbConnectionBase outerConnection)
at CoreLab.Common.DbConnectionBase.Open()
at CoreLab.Oracle.OracleConnection.Open()
John
 
Posts: 25
Joined: Fri 12 Nov 2004 21:18
Location: Durham, NC, USA

Postby Oleg » Wed 09 Mar 2005 15:48

Please specify how often this error with opening a connection happens at you (always or sometimes).
Probably this topic help you to solve the problem http://www.error-bank.com/microsoft.public.dotnet.framework.adonet/88933_Thread.aspx
Or send us a value of your environment variable PATH, and registry key HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE.
Oleg
Devart Team
 
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Object reference not set to an instance of an object

Postby John » Thu 10 Mar 2005 18:10

The application crashes about once ever six hours (or aproximatly once per 50 stored procedure calls). Unfortunatly, these reccomendations do not help because the problem is not that OCI cannot be loaded or found. The stack trace seems to indicate that the problem is in the OraDirect driver or the OCI dll.


HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE

API - c:\oracle\ora90\dbs
inst_loc - C:\Program Files\Oracle\Inventory
ORACLE_GROUP_NAME - Oracle - OraHome90
ORACLE_HOME - c:\oracle\ora90
ORACLE_HOME_NAME - OraHome90
John
 
Posts: 25
Joined: Fri 12 Nov 2004 21:18
Location: Durham, NC, USA


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