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https://issues.apache.org/jira/browse/LUCENE-812?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12475151
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Matthias Kerkhoff commented on LUCENE-812:
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>From the perspective of Lucene user I would like to add ...
- if you leave the code in there, it should work (which should be doable, the
missing argument is the lock directory, which defaults to the index directory
or, if present, from $org.apache.lucene.lockdir). Currently there is not a
single LockFactory that will NOT cause an InstantiationException.
- if the code is a leftover from some intermediate nightly snapshot, remove it
and remove any reference to the system property too.
I can live with both scenarios. I just entered this issue as I thought that the
behaviour of the code ... is a bit unexpected. In the end, if the system
property is set to whatever value lucene is unable to create an FSDirectory and
FSDirectory based IndexSearchers.
> Unable to set LockFactory implementation via
> ${org.apache.lucene.store.FSDirectoryLockFactoryClass}
> ---------------------------------------------------------------------------------------------------
>
> Key: LUCENE-812
> URL: https://issues.apache.org/jira/browse/LUCENE-812
> Project: Lucene - Java
> Issue Type: Bug
> Components: Store
> Affects Versions: 2.1
> Reporter: Matthias Kerkhoff
> Assigned To: Michael McCandless
>
> While trying to move from Lucene 2.0 to Lucene 2.1 I noticed a problem with
> the LockFactory instantiation code.
> During previous tests we successfully specified the LockFactory
> implementation by setting the property
> ${org.apache.lucene.store.FSDirectoryLockFactoryClass} to
> "org.apache.lucene.store.NativeFSLockFactory".
> This does no longer work due to a bug in the FSDirectory class. The problem
> is caused from the fact that this
> class tries to invoke the default constructor of the specified LockFactory
> class. However neither NativeFSLockFactory
> nor SimpleFSLockFactory do have a default constructor.
> FSDirectory, Line 285:
> try {
> lockFactory = (LockFactory) c.newInstance();
> } catch (IllegalAccessException e) {
> throw new IOException("IllegalAccessException when instantiating
> LockClass " + lockClassName);
> } catch (InstantiationException e) {
> throw new IOException("InstantiationException when instantiating
> LockClass " + lockClassName);
> } catch (ClassCastException e) {
> throw new IOException("unable to cast LockClass " + lockClassName
> + " instance to a LockFactory");
> }
> A possible workaround is to not set the property at all and call
> FSDirectory.setLockFactory(...) instead.
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