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https://issues.apache.org/jira/browse/LUCENE-4665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13547252#comment-13547252
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Shawn Heisey commented on LUCENE-4665:
--------------------------------------
bq. Robert Muir started work on this front (i.e. supporting Unicode 6.2) on
LUCENE-4381.
Ah, that's why it didn't come up in an issue search - it doesn't specifically
mention upgrading icu. :) Apologies for the duplication!
> Upgrade ICU4J to newest version
> -------------------------------
>
> Key: LUCENE-4665
> URL: https://issues.apache.org/jira/browse/LUCENE-4665
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/analysis
> Affects Versions: 4.0
> Reporter: Shawn Heisey
> Fix For: 4.2, 5.0
>
> Attachments: icu4j-50-4x.patch, icu4j-50-trunk.patch,
> LUCENE-4665-4x.patch, LUCENE-4665-trunk.patch
>
>
> Upgrade ICU4J to the latest version - 50.1.1 at the moment.
> DictionaryBasedBreakIterator was eliminated by the upgrade, so some very
> small code changes were required. All tests (including nightly and weekly)
> passed with patch. I did not try running tests multiple times. The
> branch_4x tests were run on Windows, where I run eclipse. The trunk tests
> were run on Linux, the platform where I actually use Solr.
> I have no idea whether the ICU tests are comprehensive enough to detect
> problems with version upgrades.
> It is possible that I don't have enough knowledge to complete this upgrade
> properly. I did my best.
> A couple of javadocs mentioned the removed class. I changed one (hopefully
> correctly), but didn't know what the other should say.
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