[jira] [Created] (CAMEL-11044) CLONE - EndpointHelper.resolveReferenceListParameter should not return immutable lists

["Chandra Bose Renganathan (JIRA)" <ji...@apache.org>]

Chandra Bose Renganathan created CAMEL-11044:
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             Summary: CLONE - EndpointHelper.resolveReferenceListParameter should not return immutable lists
                 Key: CAMEL-11044
                 URL: https://issues.apache.org/jira/browse/CAMEL-11044
             Project: Camel
          Issue Type: Improvement
          Components: camel-core
    Affects Versions: 2.16.1
            Reporter: Chandra Bose Renganathan
            Assignee: Claus Ibsen
            Priority: Minor
             Fix For: 2.16.3, 2.17.0


EndpointHelper.resolveReferenceListParameter can sometimes return immutable lists, which can cause issues when other components try to add items to those lists.

The fact that other endpoints (like jetty-common JettyHttpComponent [enableCors line 279]) can add other components into the lists can cause hard to track down failures.

Sorry don't have a patch file, but the lines i would fix in EndpointHelper.java would be:

line 350: return Collections.emptyList();

line 360: return Arrays.asList(elements.size())

These should just return ArrayLists.


I know these parameters should optionally be Lists already, and this is a slight performance hit when starting up, but i think it's better than trying to figure out what went wrong when it fails.

My particular scenario was a Jetty endpoint with a filtersRef (with a single Filter - not a list) and then enableCORS=true.  The filtersRef returned Arrays.asLIst and then enableCORS tried to add an element into that list and crashed.



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