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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-4664) Change Derby internal stored procedures to avoid DriverManager.getConnection("jdbc:default:connection") as it may be recognized by other Drivers
Date Thu, 20 May 2010 05:42:54 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4664?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kathey Marsden updated DERBY-4664:
----------------------------------

    Attachment: derby-4664_diff.txt

Attached is a patch which fixes the internal procedures in LobStoredProcedures .  I could
not find any Derby internal procedures that  use DriverManager with jdbc:default:connection.

This fix does not solve the general issue of JCC hijacking the derby stored procedure connection
for user procedures, but at least the internal procedures should not encounter the problem
which I could reproduce simply by adding db2jcc4.jar (JCC 4.1) to my classpath and running
the test jdbcapi.ClobStoredProcedureTest.



> Change Derby internal stored procedures to avoid DriverManager.getConnection("jdbc:default:connection")
as it may be recognized by other Drivers
> ------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-4664
>                 URL: https://issues.apache.org/jira/browse/DERBY-4664
>             Project: Derby
>          Issue Type: Bug
>    Affects Versions: 10.1.3.1, 10.2.2.0, 10.3.3.0, 10.4.2.0, 10.5.3.0, 10.6.1.0
>            Reporter: Kathey Marsden
>             Fix For: 10.3.3.1, 10.4.2.1, 10.5.3.1, 10.6.1.1
>
>         Attachments: derby-4664_diff.txt
>
>
> Some Derby internal Stored procedures and functions call DriverManager.getConnection("jdbc:default:connection");
and this url can be recognized by another Driver in the same classpath that is used for server
side JDBC for another product. For example the below occurred in NetworkServer when JCC was
also loaded because the JCC Type 2 driver is used for server side JDBC:
> java.lang.UnsatisfiedLinkError:        
> db2jcct2 (Not found in java.library.path):  ERRORCODE=-4472, SQLSTATE=null
> com.ibm.db2.jcc.b.SqlException
>         at com.ibm.db2.jcc.b.bd.a(bd.java:660)
>         at com.ibm.db2.jcc.b.bd.a(bd.java:60)
>         at com.ibm.db2.jcc.b.bd.a(bd.java:94)
>         at com.ibm.db2.jcc.t2.a.a(a.java:37)
>         at com.ibm.db2.jcc.t2.T2Configuration.<clinit>(T2Configuration.java:94)
>         at java.lang.J9VMInternals.initializeImpl(Native Method)
>         at java.lang.J9VMInternals.initialize(J9VMInternals.java:196)
>         at com.ibm.db2.jcc.DB2Driver.connect(DB2Driver.java:211)
>         at java.sql.DriverManager.getConnection(DriverManager.java:572)
>         at java.sql.DriverManager.getConnection(DriverManager.java:218)
>         at org.apache.derby.impl.jdbc.LOBStoredProcedure.getEmbedConnection(Unknown Source)
>         at org.apache.derby.impl.jdbc.LOBStoredProcedure.getClobObjectCorrespondingtoLOCATOR(Unknown
Source)
>         at org.apache.derby.impl.jdbc.LOBStoredProcedure.CLOBGETLENGTH(Unknown Source)
>         at org.apache.derby.exe.acf81e0010x0128x864dxbe82x00004c9b380d12.e0(Unknown Source)
>         at org.apache.derby.impl.services.reflect.DirectCall.invoke(Unknown Source)
>         at org.apache.derby.impl.sql.execute.RowResultSet.getNextRowCore(Unknown Source)
>         at org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.getNextRow(Unknown
Source)
>         at org.apache.derby.impl.jdbc.EmbedResultSet.movePosition(Unknown Source)
>         at org.apache.derby.impl.jdbc.EmbedResultSet.next(Unknown Source)
>         at org.apache.derby.impl.jdbc.EmbedCallableStatement.executeStatement(Unknown
Source)
>         at org.apache.derby.impl.jdbc.EmbedPreparedStatement.execute(Unknown Source)
>         at org.apache.derby.impl.drda.DRDAStatement.execute(Unknown Source)
>         at org.apache.derby.impl.drda.DRDAConnThread.parseEXCSQLSTTobjects(Unknown Source)
>         at org.apache.derby.impl.drda.DRDAConnThread.parseEXCSQLSTT(Unknown Source)
>         at org.apache.derby.impl.drda.DRDAConnThread.processCommands(Unknown Source)
>         at org.apache.derby.impl.drda.DRDAConnThread.run(Unknown Source)
> I think we can avoid this specific error by changing LobStoredProcedure (and perhaps
other internal procedures)  to  use the code in  SystemProcedures.getDefaultConn() which always
connects to Derby by using = InternalDriver.activeDriver()
> This of course will not solve the general problem for any user created procedure or function
that performs SQL.  I am not sure if there is a good solution for that.  I asked the JCC Driver
team to see if there is a way they can determine if they are running inside the DB2 process
or not. but regardless of these product workarounds I think the basic problem is design flaw
in the specification.  DriverManager cannot differentiate the URL if all database products
use the same one for server side JDBC.

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