Hi Paul, now i'm curious to know how the overriden java.util.Vector implements the clone method. Any chance of posting a snippet? ;)
Cheers, Edwin --- Paul Chan <[EMAIL PROTECTED]> wrote: > 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! 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