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https://issues.apache.org/jira/browse/LUCENE-3847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13222208#comment-13222208
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Uwe Schindler commented on LUCENE-3847:
---------------------------------------
As far as I remember, the main problem with the Map interface in Properties is
the values coming from the parent object (passed in Parameter). When you wrap
another properties object with one that has the other one as "defaults" given
in ctor, then your are fcked up if you are using the Map interface. Which is
not the case for system properties, but that's not guaranteed (e.g. the Java
JVM could set some basic properties in another Properties object and make the
changes available only through the overlayed properties object).
To fix the "defaults" problem I would go with the Enumeration<?> (works in Java
5, too) in a "for(Enumeration<?> e=propertyNames(); e.hasMoreElements();)" loop.
If you use the Set interface, the inherited props would not have been seen and
the system may *delete* properties which are in a parent/"defaults" properties
object.
> LuceneTestCase should check for modifications on System properties
> ------------------------------------------------------------------
>
> Key: LUCENE-3847
> URL: https://issues.apache.org/jira/browse/LUCENE-3847
> Project: Lucene - Java
> Issue Type: Improvement
> Components: general/test
> Reporter: Dawid Weiss
> Assignee: Dawid Weiss
> Priority: Minor
> Fix For: 3.6, 4.0
>
> Attachments: LUCENE-3847.patch
>
>
> - fail the test if changes have been detected.
> - revert the state of system properties before the suite.
> - cleanup after the suite.
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