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https://issues.apache.org/jira/browse/LUCENE-785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12467831
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Karl Wettin commented on LUCENE-785:
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Hmm, this must be something fairly new. I had no problems when Serializable was
introduced back in LUCENE-601.
> RAMDirectory not Serializable
> -----------------------------
>
> Key: LUCENE-785
> URL: https://issues.apache.org/jira/browse/LUCENE-785
> Project: Lucene - Java
> Issue Type: Bug
> Components: Store
> Affects Versions: 2.1
> Reporter: Matthias Seidel
> Priority: Minor
>
> The current implementation of RAMDirectory throws a NotSerializableException
> when trying to serialize, due to the inner class KeySet of HashMap not being
> serializable (god knows why)
> java.io.NotSerializableException: java.util.HashMap$KeySet
> at
> java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1081)
> Caused by line 43:
> private Set fileNames = fileMap.keySet();
> EDIT:
> while we're at it: same goes for inner class Values
> java.io.NotSerializableException: java.util.HashMap$Values
> at
> java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1081)
> Collection files = fileMap.values();
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