[jira] Commented: (SOLR-2410) ConcurrentLRUCache can throw class cast exception

[Yonik Seeley (JIRA)]

    [ 
https://issues.apache.org/jira/browse/SOLR-2410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13003668#comment-13003668
 ] 

Yonik Seeley commented on SOLR-2410:
------------------------------------

Here's the smallest version I could reproduce the issue with.

{code}
class CacheEntry<K,V> {
}

class PQueue<K,V> extends PriorityQueue<CacheEntry<K,V>> {
  public static void main(String[] args) {
    new PQueue<String,String>().tst();
  }

  PQueue() {
    super.initialize(1);
  }

  @Override
  protected boolean lessThan(CacheEntry<K,V> a, CacheEntry<K,V> b) {
    return true;
  }

  public CacheEntry<K,V> tst() {
    return heap[1];
  }
}
{code}

I just cut-n-pasted the code into BasicFunctionalityTest, run main() from my 
IDE, and presto:

{code}
Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object; 
cannot be cast to [Lorg.apache.solr.CacheEntry;
        at org.apache.solr.PQueue.tst(BasicFunctionalityTest.java:81)
        at org.apache.solr.PQueue.main(BasicFunctionalityTest.java:68)
{code}

> ConcurrentLRUCache can throw class cast exception
> -------------------------------------------------
>
>                 Key: SOLR-2410
>                 URL: https://issues.apache.org/jira/browse/SOLR-2410
>             Project: Solr
>          Issue Type: Bug
>    Affects Versions: 4.0
>            Reporter: Yonik Seeley
>             Fix For: 4.0
>
>
> ConcurrentLRUCache throws a class cast exception.

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