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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (DERBY-4073) Creation/configuration of ClientXDataSource fails because of two setSsl methods
Date Fri, 13 Mar 2009 09:12:50 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4073?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Kristian Waagan resolved DERBY-4073.

       Resolution: Fixed
    Fix Version/s:
       Derby Info: [Existing Application Impact, Release Note Needed]  (was: [Release Note
Needed, Existing Application Impact, Patch Available])

Committed patch 1a to trunk with revision 753176.
Backported to the 10.4 branch with revision 753177, and to the 10.3 branch with revision 753179.

Will perform some testing with an appserver before closing.

> Creation/configuration of ClientXDataSource fails because of two setSsl methods
> -------------------------------------------------------------------------------
>                 Key: DERBY-4073
>                 URL: https://issues.apache.org/jira/browse/DERBY-4073
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC, Network Client
>    Affects Versions:,,
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>             Fix For:,,
>         Attachments: derby-4073-1a-add_docs_and_remove_setSsl_int.diff, releaseNote.html,
> Applications using reflection (and JavaBean conventions) have problems configuring the
Derby client data sources.
> Depending on how things are done, the user may or may not see the problems.
> For instance, some applications obtain all valid data source properties and list them
with their default settings. In the case of SSL, this will be "Ssl" with value "off". When
the application is trying to call setSsl("off") through reflection it may invoke setSsl(int)
instead of setSsl(String), failing because "off" cannot be converted to an integer. In some
implementations both methods will be invoked.
> There are two ways to look at this, and I don't know which one is correct:
>   o the reflection code of the third-party applications using Derby isn't written well
>   o Derby is to blame for the problem by providing two setSsl-methods.
> I don't know if providing overloading setters violates the JavaBean spec, or any other
relevant spec we should follow.
> The easiest technical solution is to rename one of the methods or possibly making one
of them private. Both of these will break existing applications using that method to configure
a Derby client data source.
> Is doing this, and providing a release note, sufficient?
> Does anyone see any other solutions?
> It should be noted that in some applications, it is impossible to configure ClientConnectionPoolDataSource
or ClientXADataSource to use SSL. The reasons are the problem described here and DERBY-4067.
One typical class of software with this problem is application servers. A workaround is to
avoid setting the SSL property, which isn't doable if you need SSL of course...
> A related issue is whether it should be allowed to set the SSL property both through
the setter method(s) and as a connection attribute.

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