[infinispan-issues] [JBoss JIRA] (ISPN-2237) ConcurrentMapFactory does not allow use of V8 maps with Sun JDK 6

[Galder Zamarreño (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-2237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12715455#comment-12715455 ] 

Galder Zamarreño commented on ISPN-2237:
----------------------------------------

@Robert, we're only fixing critical stuff in 5.1 and this issue is not really causing any malfunctioning. If anything, it's just avoiding the use of what's considered still 'unsafe'. So, most likely we won't fix this in 5.1.x.
                
> ConcurrentMapFactory does not allow use of V8 maps with Sun JDK 6
> -----------------------------------------------------------------
>
>                 Key: ISPN-2237
>                 URL: https://issues.jboss.org/browse/ISPN-2237
>             Project: Infinispan
>          Issue Type: Bug
>    Affects Versions: 5.1.6.FINAL
>            Reporter: Robert Stupp
>            Assignee: Galder Zamarreño
>             Fix For: 5.2.0.Alpha4, 5.2.0.Final
>
>
> The implementation in ConcurrentMapFactory checks for existance of a Sun JVM private class. But although a Sun JDK/JRE 6 is used, the check fails (wrong class com.sun.unsafe.Unsafe instead of sun.misc.Unsafe).
> Sould use sun.misc.Unsafe
> {noformat}
>    static {
>       boolean sunIncompatibleJvm;
>       boolean jdk8;
>       boolean allowExperimentalMap = Boolean.getBoolean("infinispan.unsafe.allow_jdk8_chm");
>       try {
>          Class.forName("com.sun.unsafe.Unsafe");
>          sunIncompatibleJvm = false;
>       } catch (ClassNotFoundException e) {
>          sunIncompatibleJvm = true;
>       }
>       
>       try {
>          Class.forName("java.util.concurrent.atomic.LongAdder");
>          jdk8 = true;
>       } catch (ClassNotFoundException e) {
>          jdk8 = false;
>       }
>       if (jdk8 || sunIncompatibleJvm || !allowExperimentalMap)
>          MAP_CREATOR = new JdkConcurrentMapCreator();
>       else
>          MAP_CREATOR = new BackportedV8ConcurrentMapCreator();
>    }
> {noformat}

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