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NullReferenceException at GdsDatabase.Write(Int32 value) [DNET291] #302

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firebird-automations opened this issue Jan 27, 2010 · 5 comments
Closed

NullReferenceException at GdsDatabase.Write(Int32 value) [DNET291] #302

firebird-automations opened this issue Jan 27, 2010 · 5 comments
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@cincuranet
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component: ado.net provider fix-version: 2.7.5 priority: major resolution: fixed/done type: bug

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@firebird-automations
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Submitted by: lifeng liang (lifeng)

Relate to DNET421

I am using fb for my web site, and found a bug of its .net provider. The same page same code ran into this problem about once per week. I compiled fb .net provider 2.5.1 as DEBUG mode, and following is the stack track of it:

System.NullReferenceException:
at FirebirdSql.Data.Client.Managed.Version10.GdsDatabase.Write(Int32 value) location D:\Coding\Projects\FirebirdClient-2.5.1-src\NETProvider\source\FirebirdSql\Data\Client\Managed\Version10\GdsDatabase.cs:line 978
at FirebirdSql.Data.Client.Managed.Version10.GdsTransaction.BeginTransaction(TransactionParameterBuffer tpb) location D:\Coding\Projects\FirebirdClient-2.5.1-src\NETProvider\source\FirebirdSql\Data\Client\Managed\Version10\GdsTransaction.cs:line 137
at FirebirdSql.Data.Client.Managed.Version10.GdsDatabase.BeginTransaction(TransactionParameterBuffer tpb) location D:\Coding\Projects\FirebirdClient-2.5.1-src\NETProvider\source\FirebirdSql\Data\Client\Managed\Version10\GdsDatabase.cs:line 556
at FirebirdSql.Data.FirebirdClient.FbTransaction.BeginTransaction() location D:\Coding\Projects\FirebirdClient-2.5.1-src\NETProvider\source\FirebirdSql\Data\FirebirdClient\FbTransaction.cs:line 363
at FirebirdSql.Data.FirebirdClient.FbCommand.Prepare(Boolean returnsSet) location D:\Coding\Projects\FirebirdClient-2.5.1-src\NETProvider\source\FirebirdSql\Data\FirebirdClient\FbCommand.cs:line 1111
at FirebirdSql.Data.FirebirdClient.FbCommand.ExecuteCommand(CommandBehavior behavior, Boolean returnsSet) location D:\Coding\Projects\FirebirdClient-2.5.1-src\NETProvider\source\FirebirdSql\Data\FirebirdClient\FbCommand.cs:line 1174
at FirebirdSql.Data.FirebirdClient.FbCommand.ExecuteReader(CommandBehavior behavior) location D:\Coding\Projects\FirebirdClient-2.5.1-src\NETProvider\source\FirebirdSql\Data\FirebirdClient\FbCommand.cs:line 551
at FirebirdSql.Data.FirebirdClient.FbCommand.ExecuteDbDataReader(CommandBehavior behavior) location D:\Coding\Projects\FirebirdClient-2.5.1-src\NETProvider\source\FirebirdSql\Data\FirebirdClient\FbCommand.cs:line 621
at System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior)

Since GdsDatabase.Write only has one line code and the parameter value could not be null, it should be outputStream equels null somehow. And I checked all usages of outputStream, I guess GdsDatabase.Detach was called sometime and might related of connection pooling.

The following is my connection string:
User=XXX;Password=BBB;Database=studio.fdb;DataSource=localhost;Port=3050;Dialect=3;Charset=UNICODE_FSS;Role=;Connection lifetime=15;Pooling=true;MinPoolSize=0;MaxPoolSize=50;Packet Size=8192;ServerType=0
@firebird-automations
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Commented by: Sebastian Brandt (csbac)

I'm not sure whether this is the same problem, yet, seems very similar.

FirebirdSql.Data.FirebirdClient.dll 2.5.0.0
(oh, there should be a newer version)
NHibernate.dll 2.0.1.4000

In an app that usually runs w/o any problems, now and then I get
NHibernate.ADOException: could not execute query
[select ...]
System.NullReferenceException: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.
bei FirebirdSql.Data.Client.Managed.Version10.GdsTransaction.BeginTransaction(TransactionParameterBuffer tpb)
bei FirebirdSql.Data.Client.Managed.Version10.GdsDatabase.BeginTransaction(TransactionParameterBuffer tpb)
bei FirebirdSql.Data.FirebirdClient.FbTransaction.BeginTransaction()
bei FirebirdSql.Data.FirebirdClient.FbCommand.Prepare(Boolean returnsSet)
bei FirebirdSql.Data.FirebirdClient.FbCommand.ExecuteCommand(CommandBehavior behavior, Boolean returnsSet)
bei FirebirdSql.Data.FirebirdClient.FbCommand.ExecuteReader(CommandBehavior behavior)
bei FirebirdSql.Data.FirebirdClient.FbCommand.ExecuteDbDataReader(CommandBehavior behavior)
bei System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader()
bei NHibernate.AdoNet.AbstractBatcher.ExecuteReader(IDbCommand cmd)
bei NHibernate.Loader.Loader.GetResultSet(IDbCommand st, Boolean autoDiscoverTypes, Boolean callable, RowSelection selection, ISessionImplementor session)
bei NHibernate.Loader.Loader.DoQuery(ISessionImplementor session, QueryParameters queryParameters, Boolean returnProxies)
bei NHibernate.Loader.Loader.DoQueryAndInitializeNonLazyCollections(ISessionImplementor session, QueryParameters queryParameters, Boolean returnProxies)
bei NHibernate.Loader.Loader.DoList(ISessionImplementor session, QueryParameters queryParameters)
--- Ende der internen Ausnahmestapelüberwachung ---
bei NHibernate.Loader.Loader.DoList(ISessionImplementor session, QueryParameters queryParameters)
bei NHibernate.Loader.Loader.ListIgnoreQueryCache(ISessionImplementor session, QueryParameters queryParameters)
bei NHibernate.Loader.Loader.List(ISessionImplementor session, QueryParameters queryParameters, ISet`1 querySpaces, IType[] resultTypes)
bei NHibernate.Hql.Classic.QueryTranslator.List(ISessionImplementor session, QueryParameters queryParameters)
bei NHibernate.Engine.Query.HQLQueryPlan.PerformList(QueryParameters queryParameters, ISessionImplementor session, IList results)
bei NHibernate.Impl.SessionImpl.List(String query, QueryParameters queryParameters, IList results)
bei NHibernate.Impl.SessionImpl.List[T](String query, QueryParameters parameters)
bei NHibernate.Impl.QueryImpl.List[T]()

This is in the context of NHibernate, yet, the query in itself and the parameters are shown as valid. Also, the query itself is not run in a tranaction context (no changes done to the database).

I'll try again with the 2.5.2.0 version.

Yours,
Sebastian

@firebird-automations
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Modified by: @cincuranet

Link: This issue relate to DNET421 [ DNET421 ]

@firebird-automations
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Modified by: @cincuranet

status: Open [ 1 ] => In Progress [ 3 ]

@firebird-automations
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Commented by: @cincuranet

Resolved as part of DNET421.

@firebird-automations
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Modified by: @cincuranet

status: In Progress [ 3 ] => Resolved [ 5 ]

resolution: Fixed [ 1 ]

Fix Version: 2.7-next [ 10462 ]

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