[jira] [Created] (KARAF-7522) Duplicate feature name and version cause stack overflow errors

["Łukasz Dywicki (Jira)" <ji...@apache.org>]

Łukasz Dywicki created KARAF-7522:
-------------------------------------

             Summary: Duplicate feature name and version cause stack overflow errors
                 Key: KARAF-7522
                 URL: https://issues.apache.org/jira/browse/KARAF-7522
             Project: Karaf
          Issue Type: Bug
    Affects Versions: 4.2.7
            Reporter: Łukasz Dywicki
            Assignee: Łukasz Dywicki


Karaf feature resolver computation is prone to an error when same feature is defined in two descriptors. While it can be an user error, quite often this error is spot when feature generation is being used.

First occurrence of this error is seen in KARAF-6536 which links it with Windows and version ranges. I was able to reproduce issue with much simpler setup, validation with two feature files where one is "plain" and other is "aggregated".
{code:java}
Exception in thread "main" java.lang.StackOverflowError
    at java.base/java.util.AbstractCollection.<init>(AbstractCollection.java:66)
    at java.base/java.util.AbstractList.<init>(AbstractList.java:78)
    at java.base/java.util.Collections$SingletonList.<init>(Collections.java:4837)
    at java.base/java.util.Collections.singletonList(Collections.java:4823)
    at org.apache.felix.utils.resource.SimpleFilter.parseSubstring(SimpleFilter.java:367)
    at org.apache.felix.utils.resource.SimpleFilter.convert(SimpleFilter.java:564)
    at org.apache.felix.utils.resource.RequirementImpl.getFilter(RequirementImpl.java:133)
    at org.apache.felix.utils.resource.RequirementImpl.<init>(RequirementImpl.java:77)
    at org.apache.felix.utils.resource.RequirementImpl.<init>(RequirementImpl.java:44)
    at org.apache.karaf.features.internal.resolver.ResourceUtils.addIdentityRequirement(ResourceUtils.java:127)
    at org.apache.karaf.features.internal.resolver.ResourceUtils.addIdentityRequirement(ResourceUtils.java:107)
    at org.apache.karaf.features.internal.resolver.ResourceUtils.addIdentityRequirement(ResourceUtils.java:99)
    at org.apache.karaf.features.internal.region.Subsystem.requireFeature(Subsystem.java:284)
    at org.apache.karaf.features.internal.region.Subsystem.doBuild(Subsystem.java:350)
    at org.apache.karaf.features.internal.region.Subsystem.build(Subsystem.java:332)
    at org.apache.karaf.features.internal.region.Subsystem.doBuild(Subsystem.java:390)
    at org.apache.karaf.features.internal.region.Subsystem.build(Subsystem.java:332)
    at org.apache.karaf.features.internal.region.Subsystem.doBuild(Subsystem.java:390)
 {code}



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