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From "Uwe Schindler" <>
Subject RE: Is it safe to upgrade to Oracle Java 7u7 for Lucene/Solr development and use?
Date Thu, 20 Sep 2012 14:52:46 GMT
We already stated that in Lucene 3.5/3.6 release note! It’s fine since Java 7u1. There are
no news in Lucene 4.0



Uwe Schindler

H.-H.-Meier-Allee 63, D-28213 Bremen <> 



From: Jack Krupansky [] 
Sent: Thursday, September 20, 2012 4:49 PM
To: Lucene/Solr Dev
Subject: Is it safe to upgrade to Oracle Java 7u7 for Lucene/Solr development and use?


The Oracle Java Update tool on my Windows PC is pretty insistent that it wants to update my
machine to Java 7u7 and REMOVE Java 6. Is it safe to use Java 7u7 for both Lucene Solr development
and running Solr yet? My presumption has been that Lucene/Solr still “requires” Java 6.


The 4.0 Solr README.txt says to use the Java 6 JDK, but then adds “verify 

that the Java version is 1.6 or later ”, implying that a later release would be okay. Given
that Java 7 will be the “current” release, the README should make some specific statement
regarding Java 7.


And maybe the top-level README.txt should have a Java version statement – unless both 7
and 6 are fine – although there is a minimum update level that works for 7 and Lucene, right?
In any case, clear guidance should be provided.


The Solr 4.0 CHANGES.txt does say “You 

need a Java 1.6 VM or later installed”, suggesting that Java 7 is fine. No mention of Java
version requirement in the Lucene CHANGES.txt.


I may just manually install 7u7 and not use it to avoid the update notice until Lucene/Solr
“upgrades” to Java 7, but I suspect a fair number of people will simply take the update
and say goodbye to Java 6.

-- Jack Krupansky

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