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https://issues.apache.org/jira/browse/CONFIGURATION-753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17019728#comment-17019728
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Gary D. Gregory commented on CONFIGURATION-753:
-----------------------------------------------
[~tpoliaw]
Looking at
[https://commons.apache.org/proper/commons-configuration/userguide/howto_properties.html#Properties_files]
it would seem that the way to do list values in properties file is, for
example:
foo = value1, value2, value3
There is also
[https://commons.apache.org/proper/commons-configuration/userguide/howto_basicfeatures.html#List_handling]
What is worrisome is that there is some code that must build a list based on
repeated keys and I am not sure if that is documented or intentional.
Maybe someone else can chime in. I find it odd that repeating keys would build
a list since that is far from what a java.util.Properties object can do.
Thoughts?
> Handling of interpolation is inconsistent
> -----------------------------------------
>
> Key: CONFIGURATION-753
> URL: https://issues.apache.org/jira/browse/CONFIGURATION-753
> Project: Commons Configuration
> Issue Type: Bug
> Components: Interpolation
> Affects Versions: 2.5
> Environment: Java 8, Configurations2 2.5
> Reporter: Peter
> Priority: Major
> Attachments: test.properties
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> If a key is repeated in a configuration and then used in an interpolation
> elsewhere, the behaviour is inconsistent. There are other tickets/discussions
> about whether it should just pick the first value or not, but I don't think
> it should do both.
> {code:java|title=/tmp/test.properties}
> abc = hello
> abc = world
> foo.one = ${abc}
> foo.two = prefix ${abc} suffix
> {code}
> {code:java|title=Demo.java (main)}
> Parameters params = new Parameters();
> FileBasedConfigurationBuilder<FileBasedConfiguration> builder = new
> FileBasedConfigurationBuilder<FileBasedConfiguration>(PropertiesConfiguration.class)
> .configure(params.fileBased()
> .setFileName("/tmp/test.properties")
> );
> try {
> FileBasedConfiguration config = builder.getConfiguration();
> System.out.println(config.getString("foo.one"));
> System.out.println(config.getString("foo.two"));
> } catch (ConfigurationException cex) {
> // pass
> }
> {code}
> The output from the above is
> {noformat}
> hello
> prefix [hello, world] suffix
> {noformat}
> In the first case, only the first value is being matched, in the second both
> values (and [, ]) are used.
> I'd expect the output to either be
> {noformat:title=First value only}
> hello
> prefix hello suffix
> {noformat}
> or
> {noformat:title=Both values used}
> [hello, world]
> prefix [hello, world] suffix
> {noformat}
> I can work around whichever style is chosen but think it'd be much more
> intuitive if both cases were handled the same.
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