Which Java environment are you running?

super.clone() from SegmentInfos should produce a new SegmentInfos
object.

It seems like in your case it's somehow producing a Vector instead?

Mike

Paul Chan wrote:

> Hi Mike,
>
> I am actually using the Compass Search Engine which in turn makes
> use of
> Lucene. They are doing the following in their code:
>
>     IndexWriter indexWriter = new IndexWriter(dir, autoCommit,
> analyzer,
> create, deletionPolicy);
>
> where autoCommit = false.
>
> In turn, Lucene will do the following:
>
> public class IndexWriter {
>
>    public IndexWriter(Directory d, boolean autoCommit, Analyzer a,
> boolean create, IndexDeletionPolicy deletionPolicy)
>     throws CorruptIndexException, LockObtainFailedException,
> IOException
> {
>       init(d, a, create, false, deletionPolicy, autoCommit);
>    }
>
>    private void init(Directory d, Analyzer a, final boolean create,
> boolean closeDir,             IndexDeletionPolicy
> deletionPolicy,
> boolean autoCommit)
>    {
>      ...
>      ..
>      if (!autoCommit) {
>       rollbackSegmentInfos = (SegmentInfos) segmentInfos.clone();
>      }
>    }
> }
>
> which calls the clone() method that causes the exception because
> autoCommit
> = false.
>
> On Fri, Oct 3, 2008 at 4:54 PM, Michael McCandless <
> lucene@(protected):
>
>>
>> Can you describe what led up to this exception? Ie, what calls you
>> made to
>> Lucene before this.
>>
>> Mike
>>
>>
>> Paul Chan wrote:
>>
>> I think I know what the problem is looking at the code:
>>>
>>> In SegmentInfos.java (line 321):
>>>
>>> class SegmentInfos extends Vector
>>> {
>>> public Object clone() {
>>>   SegmentInfos sis = (SegmentInfos) super.clone();
>>>   for(int i=0;i<sis.size();i++) {
>>>     sis.setElementAt(((SegmentInfo) sis.elementAt(i)).clone(), i);
>>>   }
>>>   return sis;
>>> }
>>> }
>>>
>>> We see that it is trying to cast a Vector into SegmentInfos which
>>> explains
>>> the ClassCastException. This is definitely a bug.
>>>
>>>
>>> On Fri, Oct 3, 2008 at 3:40 PM, Paul Chan <wayofdragon@(protected)>
>>> wrote:
>>>
>>> Hi,
>>>>
>>>> I am using lucene 2.3.2 and I encounter the following exception
>>>> when I
>>>> try
>>>> to insert a object into the index.
>>>>
>>>> Caused by: java.lang.ClassCastException: java.util.Vector cannot
>>>> be cast
>>>> to
>>>> org.apache.lucene.index.SegmentInfos
>>>> at org.apache.lucene.index.SegmentInfos.clone (SegmentInfos.java:
>>>> 321)
>>>> at org.apache.lucene.index.IndexWriter.init (IndexWriter.java:715)
>>>> at org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:666)
>>>>
>>>> Has Anyone seen this problem before? What seems to be the problem?
>>>>
>>>> Thanks!
>>>>
>>>>
>>
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