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):

> 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!
>