[CONFIGURATION-840] StackOverflowError adding property in AbstractListDelimiterHandler.flattenIterator()

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0, 2.1, 2.1.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8.0, 2.9.0, 2.10.0
• Fix Version/s: 2.10.1
• Assignee: Gary D. Gregory
• Reporter: Bob Marinier
• Created: 13/Mar/24 20:16
• Updated: 17/Mar/24 13:24
• Resolved: 14/Mar/24 02:36

Description

In the attached reproducer, I attempt to add a Path object to a configuration programmatically. This results in a StackOverflowError.

To reproduce, run with:

mvn test

It may be that adding a Path object is not supported (indeed, when I did this I meant to add it as a String), but even so it should not result in a StackOverflowError.

The start of the stack is shown below (this just the last two lines just repeat until overflow):

java.lang.StackOverflowError
        at java.base/sun.nio.fs.WindowsPath.elementAsString(WindowsPath.java:681)
        at java.base/sun.nio.fs.WindowsPath.getName(WindowsPath.java:692)
        at java.base/sun.nio.fs.WindowsPath.getName(WindowsPath.java:42)
        at java.base/java.nio.file.Path$1.next(Path.java:931)
        at java.base/java.nio.file.Path$1.next(Path.java:920)
        at org.apache.commons.configuration2.convert.AbstractListDelimiterHandler.flattenIterator(AbstractListDelimiterHandler.java:198)
        at org.apache.commons.configuration2.convert.AbstractListDelimiterHandler.flatten(AbstractListDelimiterHandler.java:146)
        at org.apache.commons.configuration2.convert.AbstractListDelimiterHandler.flattenIterator(AbstractListDelimiterHandler.java:198)
        at org.apache.commons.configuration2.convert.AbstractListDelimiterHandler.flatten(AbstractListDelimiterHandler.java:146)
        at org.apache.commons.configuration2.convert.AbstractListDelimiterHandler.flattenIterator(AbstractListDelimiterHandler.java:198)
        at org.apache.commons.configuration2.convert.AbstractListDelimiterHandler.flatten(AbstractListDelimiterHandler.java:146)

As this appears to involve delimiter handling I even tried to configure it to use the DisabledListDelimiterHandler (not part of the reproducer), but this had no effect.