Re: [ jEdit-devel ] Don't use Java 7 for anything.

[Dale A. <da...@gr...>]

Has anyone tried Java 7 with jEdit yet? If so, have you seen any problems?



On Mon, Aug 8, 2011 at 9:58 AM, Alan Ezust <ala...@gm...> wrote:

>
> http://www.lucidimagination.com/blog/2011/07/28/dont-use-java-7-for-anything/
>
> Oracle released Java 7 today. Unfortunately it contains hotspot compiler
> optimizations, which miscompile some loops. This can affect code of several
> Apache projects. Sometimes JVMs only crash, but in several cases, results
> calculated can be incorrect, leading to bugs in applications (see Hotspot
> bugs 7070134 [1], 7044738 [2], 7068051 [3]).
>
> Apache Lucene Core and Apache Solr are two Apache projects, which are
> affected by these bugs, namely all versions released until today. Solr
> users
> with the default configuration will have Java crashing with SIGSEGV as soon
> as they start to index documents, as one affected part is the well-known
> Porter stemmer (see LUCENE-3335 [4]). Other loops in Lucene may be
> miscompiled, too, leading to index corruption (especially on Lucene trunk
> with pulsing codec; other loops may be affected, too – LUCENE-3346 [5]).
>
> These problems were detected only 5 days before the official Java 7
> release,
> so Oracle had no time to fix those bugs, affecting also many more
> applications. In response to our questions, they proposed to include the
> fixes into service release u2 (eventually into service release u1, see
> [6]).
> This means you cannot use Apache Lucene/Solr with Java 7 releases before
> Update 2! If you do, please don’t open bug reports, it is not the
> committers’ fault! At least disable loop optimizations using the
> -XX:-UseLoopPredicate JVM option to not risk index corruptions.
>
> Please note: Also Java 6 users are affected, if they use one of those JVM
> options, which are not enabled by default: -XX:+OptimizeStringConcat or
> -XX:+AggressiveOpts
>
> It is strongly recommended not to use any hotspot optimization switches in
> any Java version without extensive testing!
>
>
>
>
>
>
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