Seems like I found the culprit to the problem. Because I am using
Terracotta to doing JVM clustering, it has overriden many classes of
java.util.*. If I take out Terracotta from my configuration, then I don't
get the ClassCastException problem any longer. I will talk to the
Terracotta folks to see if I have done something wrong on my end.
Thanks again for everyone's help!
On Mon, Oct 6, 2008 at 12:26 PM, Paul Chan <[EMAIL PROTECTED]> wrote:
> Hi Edwin,
>
> Yes, I am running the TestVector against the same class path as my actual
> application. My class path contains the Lucene JAR files. This is very
> bizzard because my TestVector class extends Vector and it works, but for
> some reason SegmentInfos also extends Vector but it doesnt work.
> I did some more investigation and I found the following:
>
> final class SegmentInfos extends Vector
> {
> public Object clone() {
> Object a = super.clone(); --> code that I added to do some debug
> SegmentInfos sis = (SegmentInfos) a;
> ...
> }
> }
>
> When super.clone() returns, it actually returns a Vector object instead of
> a SegmentInfos object against my expectation so that explains why the
> ClassCastException occurs. On the other hand, when I run my TestVector
> class:
>
> final class TestVector extends Vector
> {
> public Object clone() {
> Object a = super.clone(); --> code that I added to do some debug
> TestVector sis = (TestVector) a;
> ...
> }
> }
>
> When super.clone() returns, it returns TestVector!
>
> This tells me that there is something wrong with Lucene build file that
> causes this problem, but I have no idea what it could be. In Lucene's
> common-build.xml, I changed the 1.4 properties to 1.6 propreties but still
> to no avail.
>
>
>
> On Mon, Oct 6, 2008 at 12:04 PM, Edwin Lee <[EMAIL PROTECTED]>wrote:
>
>> Hi Paul,
>>
>> When you say that your dummy TestVector class works, are you running it
>> using
>> the same classpaths that you used to run your actual application? Does it
>> contain the Lucene JAR files?
>>
>>
>>
>> Regards,
>> Edwin
>>
>>
>>
>> --- Paul Chan <[EMAIL PROTECTED]> wrote:
>>
>> > I have tried to recompile Lucene 2.3.2 under my environment (SUN JDK
>> 1.6)
>> > and it still doesn't work. I am beginning to think that maybe there is
>> > something wrong with lucene's build script. My TestVector class's
>> clone()
>> > method works without a hitch, but SegmentInfos' clone() method doesnt
>> work
>> > at all. I don't really know what to do at this moment. Does anyone
>> have
>> > any insight?
>> >
>> > On Sun, Oct 5, 2008 at 10:45 PM, Paul Chan <[EMAIL PROTECTED]>
>> wrote:
>> >
>> > > Thank you all for your input. However, this is what I have discovered
>> so
>> > > far:
>> > >
>> > > - I tried running the test that Edwin suggested and it failed for
>> me in
>> > > my environment (Lucene 2.3.2, Windows XP, SUN JDK 1.5 or 1.6)
>> > >
>> > > e.g. SegmentInfos sis = new SegmentInfos();
>> > > SegmentInfos sis2 = (SegmentInfos) sis.clone();
>> > >
>> > > - Interestingly, I tried to create a dummy test class which mimics
>> > > SegmentInfos as follows and it works!:
>> > >
>> > > public class TestVector extends Vector
>> > > {
>> > > public TestVector clone()
>> > > {
>> > > TestVector cl = (TestVector)super.clone();
>> > > return cl;
>> > > }
>> > > }
>> > >
>> > > TestVector vector = new TestVector();
>> > > TestVector vClone = (TestVector)vector.clone();
>> > >
>> > > - This tells me that perhaps there is something wrong with the
>> lucene
>> > > package that I have downloaded (some sort of incompatibility?). I
>> will
>> > try
>> > > to recompile the lucene package in my own environment and see if I
>> can
>> > fix
>> > > the problem.
>> > >
>> > >
>> > > On Sat, Oct 4, 2008 at 2:21 AM, Edwin Lee <[EMAIL PROTECTED]
>> >wrote:
>> > >
>> > >> i think, very likely, you have another copy of java.util.Vector
>> loaded,
>> > >> and
>> > >> this one tries to be too clever with its implementation of clone
>> > >> (instantiate a
>> > >> new Vector instance) instead of delegating to its super class
>> (Object).
>> > >>
>> > >>
>> > >>
>> > >> HTH,
>> > >> Edwin
>> > >>
>> > >>
>> > >>
>> > >> --- Chris Hostetter <[EMAIL PROTECTED]> wrote:
>> > >>
>> > >> >
>> > >> > : SegmentInfos sis = (SegmentInfos) super.clone();
>> > >> >
>> > >> > : We see that it is trying to cast a Vector into SegmentInfos which
>> > >> explains
>> > >> > : the ClassCastException. This is definitely a bug.
>> > >> >
>> > >> > I'm really not sure how you could be getting that
>> ClassCastException
>> > >> > unless there's a really horrific bug in the JRE you are using.
>> > >> >
>> > >> > You'll see this in just about every (non-trivial) use of
>> super.clone()
>> > >> ...
>> > >>
>> > >>
>> > >>
>> > >> Yahoo! Toolbar is now powered with Search Assist.Download it
>> now!
>> > >> http://sg.toolbar.yahoo.com/
>> > >>
>> > >>
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>> >
>>
>>
>>
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