Microsoft KB Archive/817326

= FIX: JDBC Driver May Cause Application to Stop Responding During Multiple Transactions =

Article ID: 817326

Article Last Modified on 2/22/2007

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APPLIES TO


 * Microsoft SQL Server 2000 Driver for JDBC

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SYMPTOMS
The Microsoft SQL Server 2000 Driver for JDBC may cause an application to stop responding, or &quot;hang,&quot; while working with concurrent transactions in a multi-threaded environment. A thread dump file that is generated during the hang (with the 'kill -quit ' command in a Unix environment, or with the CTRL+SHIFT+BREAK key combination in the command session where the application is launched in a Windows environment) shows the following call stack: java.net.SocketInputStream.socketRead java.net.SocketInputStream.read com.microsoft.util.UtilSocketDataProvider.getArrayOfBytes com.microsoft.util.UtilBufferedDataProvider.cacheNextBlock com.microsoft.util.UtilBufferedDataProvider.getArrayOfBytes com.microsoft.jdbc.sqlserver.SQLServerDepacketizingDataProvider.signalStartOfPacket com.microsoft.util.UtilDepacketizingDataProvider.getArrayOfBytes com.microsoft.util.UtilPagedTempBuffer.write com.microsoft.util.UtilPagedTempBuffer.write com.microsoft.util.UtilByteArrayDataProvider.receive com.microsoft.util.UtilByteOrderedDataReader.receive com.microsoft.jdbc.sqlserver.tds.TDSRPCRequest.submitRequest com.microsoft.jdbc.sqlserver.tds.TDSCursorRequest.sendCursorFetch com.microsoft.jdbc.sqlserver.tds.TDSCursorRequest.openCursor com.microsoft.jdbc.sqlserver.SQLServerImplStatement.execute com.microsoft.jdbc.base.BaseStatement.commonExecute com.microsoft.jdbc.base.BaseStatement.executeQueryInternal com.microsoft.jdbc.base.BasePreparedStatement.executeQuery



CAUSE
When the Java application, or the application server that initiates and manages transactions on multiple threads using the Microsoft JDBC driver, switches from manual commit mode to auto commit mode between transactions, the driver does not automatically commit any open transactions. This can cause tables to remain locked. When a table remains locked, any subsequent query against that table stops responding.



RESOLUTION
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question. The English version of this fix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.  The Windows version of this fix has the following properties:

Date        Time   Version            Size    File name -  30-Dec-2002  16:39  2.2.0030          286,707  Msbase.jar 30-Dec-2002 16:40  2.2.0030           67,053  Mssqlserver.jar 30-Dec-2002 16:40  2.2.0030           58,903  Msutil.jar

The Unix-based version of this fix has the following properties:

Date        Time   Version            Size    File name -  31-Mar-2003  18:36  2.2.0030          286,707  Msbase.jar 31-Mar-2003 18:36  2.2.0030           67,053  Mssqlserver.jar 31-Mar-2003 18:36  2.2.0030           58,903  Msutil.jar Note Although the file dates are different for each operating system that is listed, internally the files are exactly the same. The best way to determine the version of the driver that you are using is to use the getDriverVersion method of the DatabaseMetaData interface.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

Additional query words: java type4 XA



Keywords: kbhotfixserver kbqfe kbqfe KB817326

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