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From Bin Lan <>
Subject Re: Upgrade Lucene to latest version (4.0) from 2.4.0
Date Wed, 09 Jan 2013 19:17:16 GMT
We recently went through the same process. We upgraded our indexing service
from 1.9.1 to 3.6.1. Unfortunately, the process is not as easy as you
thought. Besides replacing the jar files. You also need to change your code
to adopt to the new API. There are many changes, the most import parts are
in IndexWriter, IndexReader, and IndexSearcher classes.

Bin Lan
Software Developer
Perimeter E-Security
O - (203)541-3412

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On Wed, Jan 9, 2013 at 2:04 PM, saisantoshi <> wrote:

> We have an existing application which uses Lucene 2.4.0 version. We are
> thinking of upgrading it to alatest version (4.0). I am not sure the
> process
> involved in upgrading to latest version. Is it just copying of the jars? If
> yes, what are all the jars that we need to copy over. Will it be backward
> compatible? Any additional measures we need to take care of?
> With version 2.4.0, we have the following jars:
> lucene-core-2.4.0.jar
> lucene-analyzers-2.4.0.jar
> With 4.0:
> lucene-analyzers-common-4.0.0.jar
> lucene-analyzers-icu-4.0.0.jar
> lucene-core-4.0.0.jar
> Any advise on this is much appreciated?
> Thanks,
> Sai.
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