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https://issues.apache.org/jira/browse/CONFIGURATION-342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12641950#action_12641950
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Oliver Heger commented on CONFIGURATION-342:
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It seems to me that the support for properties with multiple values in
DatabaseConfiguration is broken. I don't know whether it ever worked, but I
doubt it. I guess the problem is that when inserting the 2nd value of the
property the database throws an exception similar to the following one:
{{java.sql.SQLException: Violation of unique constraint $$: duplicate value(s)
for column(s) $$: SYS_PK_47 in statement [INSERT INTO configuration (key,
value) VALUES (?, ?)]}}
(This is at least what I get in the unit tests.) This exception is not
re-thrown by the configuration, but an error event is fired. If you register an
error listener, you will probably see such an event.
I am not sure how to handle this problem. IMO the only solution would be to
require an additional database column with a unique ID, so that no unique
constraint can be violated. However, then we have to deal with stuff like ID
generation, which can be highly specific depending on the use case.
> DatabaseConfiguration.copy() loses list/array values
> ----------------------------------------------------
>
> Key: CONFIGURATION-342
> URL: https://issues.apache.org/jira/browse/CONFIGURATION-342
> Project: Commons Configuration
> Issue Type: Bug
> Components: Type conversion
> Affects Versions: 1.5
> Reporter: Scott Wells
>
> I've found a bug where adding a list property to a BaseConfiguration, then
> copying that full BaseConfiguration to a DatabaseConfiguration, the list is
> lost and only the first element is copied to the destination
> DatabaseConfiguration. For example:
> BaseConfiguration bc = new BaseConfiguration();
> bc.addProperty("myList", Arrays.asList("1", "2", "3", "4");
> DatabaseConfiguration dc = new DatabaseConfiguration(...);
> dc.copy(bc);
> List list = dc.getList("myList");
> // At this point, you'll get a single element list containing only "1"
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