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From "Shai Erera (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2688) NativeFSLockFactory throws an exception on Android 2.2 platform as java.lang.management package is not available on android.
Date Tue, 05 Oct 2010 13:09:32 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12917962#action_12917962
] 

Shai Erera commented on LUCENE-2688:
------------------------------------

I don't understand why does an Android app need to lock the index at all, and even if -- can't
SimpleFS work?

java.util.management is perfectly legit, and is not an external dependency or anything. Luckily
Android includes java.util.concurrent -- what if it didn't? Would we attempt to fix Lucene
too (IndexReader wouldn't work, for example).

I personally don't mind if we fix it though, to use nanoTime() or wrap with try-catch and
fallback to using nanoTime() there.

It's just a question of what do we want to say about Android support.

> NativeFSLockFactory throws an exception on Android 2.2 platform as java.lang.management
package is not available on android.
> ----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-2688
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2688
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Store
>    Affects Versions: 3.0, 3.0.1, 3.0.2
>         Environment: Android 2.2 Froyo Nexus One
>            Reporter: Surinder Pal Singh Bindra
>             Fix For: 2.9.4, 3.0.3, 3.1, 4.0
>
>
> NativeFSLockFactory throws an exception on Android 2.2 platform as java.lang.management
package is not available on android.
>    Looks like FSDirectory defaults to NativeFSLockFactory, and this class refers to java.lang.management
package to generate a unique lock. java.lang.management is not available in Android 2.2 and
hence a runtime exception is raised. The workaround is to use another custom LockFactory or
SimpleFSLockFactory, but Fixing NativeFSLockFactroy will help.
> Thanks,
> Surinder

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