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https://issues.apache.org/jira/browse/LUCENE-3847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13222224#comment-13222224
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Dawid Weiss commented on LUCENE-3847:
-------------------------------------
Now I remember what it was that I had a problem with. Properties has the notion
of "defaults" so it falls back to another Properties by default if the key is
not present. Unfortunately get() is not overridden in Properties (and
everything else is) so things like propertyNames or getProperty will return a
value from the fallback set, but get() won't.
{code}
public static void main(String[] args) {
Properties defaults = new Properties();
Properties p = new Properties(defaults);
String key = "custom-key";
String value = "value";
defaults.put(key, value);
for (Enumeration<?> e = p.propertyNames(); e.hasMoreElements();) {
Object currentKey = e.nextElement();
if (currentKey == key) {
System.out.println("Default key found in propertyNames(), but...");
System.out.println("p.get()=" + p.get(key));
System.out.println("p.getProperty()=" + p.getProperty(key));
}
}
}
{code}
You can easily corrupt other programs by inserting Object values into the
system property set -- any enumeration will then fail with a classcast. Still
don't remember where this caused a problem but it definitely was.
> 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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