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Posted to dev@lucene.apache.org by "Surinder Pal Singh Bindra (JIRA)" <ji...@apache.org> on 2010/10/05 08:53:32 UTC
[jira] Created: (LUCENE-2688) NativeFSLockFactory throws an
exception on Android 2.2 platform as java.lang.management package is not
available on android.
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: 3.0.2, 3.0.1, 3.0
Environment: Android 2.2 Froyo Nexus One
Reporter: Surinder Pal Singh Bindra
Fix For: 2.9.3
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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[jira] Resolved: (LUCENE-2688) NativeFSLockFactory throws an
exception on Android 2.2 platform as java.lang.management package is not
available on android.
Posted by "Michael McCandless (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/LUCENE-2688?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael McCandless resolved LUCENE-2688.
----------------------------------------
Resolution: Fixed
This issue was fixed, as a side effect of fixing LUCENE-2689, which removed the acquireTestLock method (the only thing using j.l.management.*) entirely.
> 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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[jira] Commented: (LUCENE-2688) NativeFSLockFactory throws an
exception on Android 2.2 platform as java.lang.management package is not
available on android.
Posted by "Shai Erera (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/LUCENE-2688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12917951#action_12917951 ]
Shai Erera commented on LUCENE-2688:
------------------------------------
Isn't it part of Java 5? Is Android using a different JDK? I agree w/ Robert on one hand, but adding a try-catch and fallback seems reasonable in this case.
I'd only like to understand how is it that java.lang.management does not exist on Android, because that might indicate other classes don't exist as well, and thus fixing NativeFSLockFactory won't solve the real problem of running Lucene 3.x on Android.
> 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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[jira] Commented: (LUCENE-2688) NativeFSLockFactory throws an
exception on Android 2.2 platform as java.lang.management package is not
available on android.
Posted by "Michael McCandless (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/LUCENE-2688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12918000#action_12918000 ]
Michael McCandless commented on LUCENE-2688:
--------------------------------------------
I'm not talking about Android support -- that's a much larger (and
more challenging) question.
I'm talking about relying on as few dependencies (including java APIs)
as possible, to reduce the chance of problems. This philosophy
applies all across lucene sources, but especially to our very low
level APIs like locking.
So... is/was j.l.management really the only way to solve this problem?
Wouldn't seeding with System.nanoTime also suffice?
Hmm... maybe a better solution is to stop acquiring a test lock
altogether? Only NativeFSLockFactory does this..., and it's actually
rather silly, because we acquireTestLock when .makeLock is called,
yet, the caller who called .makeLock will presumably shortly
thereafter call .obtain on that lock and will at that point see an
exception if there are issues with native locks on the current
filesystem.
Note that we are only trying to generate a unique name for the *test*
lock that the lock factory acquires to verify locking will work. As
far as I know, no app has ever hard a problem with this, ie, this is a
test-only problem. In fact, even reading through LUCENE-2421 again, I
don't get why our tests are running simultaneous tests sharing the
same lock directory? Shai do you remember which specific tests cause
problems? And if the test lock was a problem, why then was the real
lock not a problem?
> 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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[jira] Commented: (LUCENE-2688) NativeFSLockFactory throws an
exception on Android 2.2 platform as java.lang.management package is not
available on android.
Posted by "Michael McCandless (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/LUCENE-2688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12917925#action_12917925 ]
Michael McCandless commented on LUCENE-2688:
--------------------------------------------
I agree we should fix this. We want portability. This is only used to try to create a unique lock name...
Can we somehow load this dynamically? Such that on JVMs that do not have it, we fallback?
> 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: 2.9.3
>
>
> 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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[jira] Commented: (LUCENE-2688) NativeFSLockFactory throws an
exception on Android 2.2 platform as java.lang.management package is not
available on android.
Posted by "Robert Muir (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/LUCENE-2688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12917952#action_12917952 ]
Robert Muir commented on LUCENE-2688:
-------------------------------------
bq. I'd only like to understand how is it that java.lang.management does not exist on Android, because that might indicate other classes don't exist as well, and thus fixing NativeFSLockFactory won't solve the real problem of running Lucene 3.x on Android.
exactly my point!
android doesn't have all the java apis (only a subset: http://developer.android.com/reference/packages.html)
its not actually java...
either we want lucene to fully work on it (which means we intentionally limit ourselves to the intersection of the
java apis and the android apis, install a simulator on hudson, ensure ant test passes, etc), or we don't.
but i don't think we should degrade anything for it, in other words we shouldn't limit ourselves to its subset
if the damn thing isn't going to work anyway.
> 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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[jira] Commented: (LUCENE-2688) NativeFSLockFactory throws an
exception on Android 2.2 platform as java.lang.management package is not
available on android.
Posted by "Uwe Schindler (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/LUCENE-2688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12917966#action_12917966 ]
Uwe Schindler commented on LUCENE-2688:
---------------------------------------
+1, it's *java.lang*.management, which is even in the basic "lang" package. If Android does not have it, its a killer. On android, you can work around with SimpleFSLock. If we start to supply workarounds, we will get into a hell of supporting abstruse environments.
> 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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[jira] Issue Comment Edited: (LUCENE-2688) NativeFSLockFactory
throws an exception on Android 2.2 platform as java.lang.management package
is not available on android.
Posted by "Shai Erera (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/LUCENE-2688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12917962#action_12917962 ]
Shai Erera edited comment on LUCENE-2688 at 10/5/10 9:25 AM:
-------------------------------------------------------------
I don't understand why does an Android app need to lock the index at all, and even if -- can't SimpleFS work?
java.lang.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.
was (Author: shaie):
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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[jira] Commented: (LUCENE-2688) NativeFSLockFactory throws an
exception on Android 2.2 platform as java.lang.management package is not
available on android.
Posted by "Robert Muir (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/LUCENE-2688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12917973#action_12917973 ]
Robert Muir commented on LUCENE-2688:
-------------------------------------
bq. 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 think it goes much deeper than this, besides having the APIs, do they *actually work* ?
For example, with apache harmony (android uses its classlib!)
there was/is some work to actually make tests pass: HARMONY-6640, HARMONY-6648, HARMONY-6649, HARMONY-6650
fortunately the harmony developers were very helpful in getting things moving,
but my point is that unless the tests pass, its pointless to waste time looking at the APIs
> 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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[jira] Commented: (LUCENE-2688) NativeFSLockFactory throws an
exception on Android 2.2 platform as java.lang.management package is not
available on android.
Posted by "Robert Muir (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/LUCENE-2688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12917954#action_12917954 ]
Robert Muir commented on LUCENE-2688:
-------------------------------------
bq. Maybe we can fix it for tests only (eg swap in different impl when tests are running...)?
I think the actual tests should use our real code, as for LuceneJUnitResultFormatter, yes, i think you are right.
> 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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[jira] Commented: (LUCENE-2688) NativeFSLockFactory throws an
exception on Android 2.2 platform as java.lang.management package is not
available on android.
Posted by "Michael McCandless (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/LUCENE-2688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12917953#action_12917953 ]
Michael McCandless commented on LUCENE-2688:
--------------------------------------------
{quote}
I don't think this is a bug.
We are talking about android... its not actually Java...
{quote}
I agree!
This is not a bug, and we do not support Android (there
are many things besides this usage of j.l.management that cause
problems for Lucene on Android, right?).
But, separately, I think when possible Lucene should use simpler code,
fewer APIs, etc., to minimize the risk of problems.
This usage of j.l.management seems frivolous? Can't we simply do a
better job seeding Random (eg with System.nanoTime()), instead?
Or, make the usage of j.l.management dynamic?
Note that this was added for LUCENE-2421, which was only to make
sure our tests don't make conflicting locks. It seems very unlikely
a "real" app would hit this (the lock files live in the index dir). Maybe
we can fix it for tests only (eg swap in different impl when tests are
running...)?
> 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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[jira] Updated: (LUCENE-2688) NativeFSLockFactory throws an
exception on Android 2.2 platform as java.lang.management package is not
available on android.
Posted by "Michael McCandless (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/LUCENE-2688?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael McCandless updated LUCENE-2688:
---------------------------------------
Fix Version/s: (was: 2.9.3)
4.0
3.1
3.0.3
2.9.4
> 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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[jira] Commented: (LUCENE-2688) NativeFSLockFactory throws an
exception on Android 2.2 platform as java.lang.management package is not
available on android.
Posted by "Robert Muir (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/LUCENE-2688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12917945#action_12917945 ]
Robert Muir commented on LUCENE-2688:
-------------------------------------
I don't think this is a bug.
We are talking about android... its not actually Java...
> 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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[jira] Commented: (LUCENE-2688) NativeFSLockFactory throws an
exception on Android 2.2 platform as java.lang.management package is not
available on android.
Posted by "Shai Erera (JIRA)" <ji...@apache.org>.
[ 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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