[logback-dev] [JIRA] Created: (LBCLASSIC-210) configuration: property: detect circular references

[Cristian Vasile Mocanu (JIRA)]

configuration: property: detect circular references
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                 Key: LBCLASSIC-210
                 URL: http://jira.qos.ch/browse/LBCLASSIC-210
             Project: logback-classic
          Issue Type: Improvement
          Components: joran
    Affects Versions: 0.9.21
            Reporter: Cristian Vasile Mocanu
            Assignee: Logback dev list


In case I have cycles in properties, I get an unfriendly StackOverflowError in OptionHelper. I am referring to properties like this:
{code}
a=${b}
b=${a}
{code}

It would be nice to detect these cases and show a nice error message explaining the actual problem, instead of StackOverflowError.

For inspiration, you can take a look at Spring's PropertyPlaceholderConfigurer (the actual place where they detect this is org.springframework.util.PropertyPlaceholderHelper#parseStringValue in version 3.0.1.RELEASE).

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