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From "Steven Hendrickx (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-5096) DisconnectException: "Connection was refused because the database DB was not found" on OS/400
Date Mon, 07 Mar 2011 15:18:59 GMT

     [ https://issues.apache.org/jira/browse/DERBY-5096?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steven Hendrickx updated DERBY-5096:
------------------------------------

    Description: 
A process starts derby as network server (new NetworkServerControl, start) and waits for derby
to respond (retry ping until success). After the server has started, the same process makes
a connection with DriverManager.getConnection().

The first time this process runs, this will always fail with  "SQLNonTransientConnectionException:
The connection was refused because the database Flows;create=true was not found." However,
at the same time, "derby.log" and "Flows" directory are created in the derby home. The "Flows"
directory contains "log", "seg0", "tmp", "db.lck", "service.properties", etc ...

The second time the process is started, the connection will succeed and the "Flows" database
can be used successfully. From now on, every start will be successful. After cleaning the
derby home directory, you get the exception again after the first start.

The attachment contains a Java program (DerbyGetConnection.java) that reproduces this problem
consistently on our OS/400 V7R1M0 with IBM J9 VM. Probably this may happen on other systems
too (Win7), but we were unable to reproduce it there (on my machine with Win7, this same program
ran successful every run; might be a threading or I/O issue that occurs easily on slower hardware?).
The attachment contains also derby tracing ("derby.drda.traceAll") and logging/tracing of
the DriverManager.

  was:
A process starts derby as network server (new NetworkServerControl, start) and waits for derby
to respond (retry ping until success). After the server has started, the same process makes
a connection with DriverManager.getConnection().

The first time this process runs, this will always fail with  "SQLNonTransientConnectionException:
The connection was refused because the database Flows;create=true was not found." However,
at the same time, "derby.log" and "Flows" directory are created in the derby home. The "Flows"
directory contains "log", "seg0", "tmp", "db.lck", "service.properties", etc ...

The second time the process is started, the connection will succeed and the "Flows" database
can be used successfully.

The attachment contains a Java program (DerbyGetConnection.java) that reproduces this problem
consistently on our OS/400 V7R1M0 with IBM J9 VM. Probably this may happen on other systems
too (Win7), but we were unable to reproduce it there (on my machine with Win7, this same program
ran successful every run; might be a threading or I/O issue that occurs easily on slower hardware?).
The attachment contains also derby tracing ("derby.drda.traceAll") and logging/tracing of
the DriverManager.


> DisconnectException: "Connection was refused because the database DB was not found" on
OS/400
> ---------------------------------------------------------------------------------------------
>
>                 Key: DERBY-5096
>                 URL: https://issues.apache.org/jira/browse/DERBY-5096
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Server
>    Affects Versions: 10.7.1.1
>         Environment: System: OS/400 V7R1M0 on PowerPC; JVM: IBM J9 VM 2.4 (continuously
reproducible). 
> Probably Windows 7 64 bit with Sun VM (1.6) too (but not reproduced)
>            Reporter: Steven Hendrickx
>         Attachments: getconnection_reproduce.zip
>
>
> A process starts derby as network server (new NetworkServerControl, start) and waits
for derby to respond (retry ping until success). After the server has started, the same process
makes a connection with DriverManager.getConnection().
> The first time this process runs, this will always fail with  "SQLNonTransientConnectionException:
The connection was refused because the database Flows;create=true was not found." However,
at the same time, "derby.log" and "Flows" directory are created in the derby home. The "Flows"
directory contains "log", "seg0", "tmp", "db.lck", "service.properties", etc ...
> The second time the process is started, the connection will succeed and the "Flows" database
can be used successfully. From now on, every start will be successful. After cleaning the
derby home directory, you get the exception again after the first start.
> The attachment contains a Java program (DerbyGetConnection.java) that reproduces this
problem consistently on our OS/400 V7R1M0 with IBM J9 VM. Probably this may happen on other
systems too (Win7), but we were unable to reproduce it there (on my machine with Win7, this
same program ran successful every run; might be a threading or I/O issue that occurs easily
on slower hardware?).
> The attachment contains also derby tracing ("derby.drda.traceAll") and logging/tracing
of the DriverManager.

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