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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (DERBY-6626) Check type of user-supplied modules before creating instances
Date Wed, 09 Jul 2014 11:09:05 GMT

     [ https://issues.apache.org/jira/browse/DERBY-6626?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Knut Anders Hatlen resolved DERBY-6626.
---------------------------------------

       Resolution: Fixed
    Fix Version/s: 10.11.0.0
         Assignee: Knut Anders Hatlen

> Check type of user-supplied modules before creating instances
> -------------------------------------------------------------
>
>                 Key: DERBY-6626
>                 URL: https://issues.apache.org/jira/browse/DERBY-6626
>             Project: Derby
>          Issue Type: Improvement
>          Components: Miscellaneous
>    Affects Versions: 10.11.0.0
>            Reporter: Knut Anders Hatlen
>            Assignee: Knut Anders Hatlen
>             Fix For: 10.11.0.0
>
>         Attachments: d6626-1a-encryptionProvider.diff, d6626-2a.diff, d6626-3a-custom-tools.diff
>
>
> Derby allows users to specify names of classes to use for various pluggable modules.
> In some cases, it verifies that the class implements the expected interface before it
creates an instance of the class. For example in SpecificAuthenticactionServiceImpl:
> {code}
> 			Class sasClass = Class.forName(specificAuthenticationScheme);
> 			if (!UserAuthenticator.class.isAssignableFrom(sasClass)) {
> 				throw StandardException.newException(SQLState.AUTHENTICATION_NOT_IMPLEMENTED,
> 					specificAuthenticationScheme, "org.apache.derby.authentication.UserAuthenticator");
> 			}
> 			UserAuthenticator aScheme = (UserAuthenticator) sasClass.newInstance();
> {code}
> In other cases, it creates an instance without checking, and instead fails with a ClassCastException
or some other exception when trying to use the instance of the incorrect type. Examples: Java5SystemProcedures
SYSCS_REGISTER_TOOL(), JCECipherFactory, SequenceUpdater.makePreallocator().
> I think it would be good to have similar checks in these other cases too. That'll give
clearer error messages which explain what the problem is, and it will be safer because it
limits which constructors the users can force the Derby engine to invoke.



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