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https://issues.apache.org/jira/browse/DERBY-4688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12875103#action_12875103
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Kathey Marsden commented on DERBY-4688:
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I was not thinking of new release notes for 10.6.1. My main goal was to file
the issue so it would be easily found on a search if someone hits it and attach
a release note to the issue. If we could close it 'Won't Fix' and then somehow
get it to show up on the 10.6.2 release notes that would be good.
> With Derby 10.6 and higher, selecting object columns from system tables ERROR
> XN020: Error marshalling or unmarshalling a user defined type
> -------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: DERBY-4688
> URL: https://issues.apache.org/jira/browse/DERBY-4688
> Project: Derby
> Issue Type: Bug
> Components: Network Client
> Affects Versions: 10.7.0.0
> Reporter: Kathey Marsden
> Priority: Minor
>
> If derby.jar is not in the classpath when a client selects an object from a
> system table, for example selecting ALIASINFO from SYS.SYSALIASES an error
> will result, eg.
> ERROR XN020: Error marshalling or unmarshalling a user defined type:
> org.apache.
> derby.catalog.types.RoutineAliasInfo
> To reproduce, put only derbyclient.jar and derbytools.jar in your classpath
> and connect to a running server and run:
> ij> connect 'jdbc:derby://localhost:1527/wombat;create=trrue';
> ij> select * from sys.sysaliases
> > > ;
> ALIASID |ALIAS
> |SCHEMAID |JAVACLASSNAME
> |&|&|SYST&|ALIASINFO |SPECIFICNAME
> --------------------------------------------------------------------------------
> --------------------------------------------------------------------------------
> --------------------------------------------------------------------------------
> --------------------------------------------------------------------------------
> --------------------------------------------------------------------------------
> --------------------------------------------------------------------------------
> ------
> ERROR XN020: Error marshalling or unmarshalling a user defined type:
> org.apache.
> derby.catalog.types.RoutineAliasInfo
> ij>
> With the 10.5 client it gives the text of the procedure or function
> definition for ALIASINFO may have been useful to someone, e.g.
> SQLCAMESSAGE(IN SQLCODE INTEGER,IN SQLERRML SMALLINT,IN SQLERRMC
> VARCHAR(2400),I
> N SQLERRP CHAR(8),IN SQLERRD0 INTEGER,IN SQLERR&
> I am not sure what can or should be done about this issue. Workaround
> include:
> - Cast the value to LONG VARCHAR in the query.
> - Put the server jars in the classpath if you want to use the objects.
> - Remove extraneous columns if they are not used.
> I am not sure what can or should be done about this issue, but a release note
> would at least help mitigate it.
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