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https://issues.apache.org/jira/browse/LUCENE-785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12467838
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Michael McCandless commented on LUCENE-785:
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OK, here's a quick unit test that catches the regression:
public void testSerializable() throws IOException {
Directory dir = new RAMDirectory();
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutput out = new ObjectOutputStream(bos);
out.writeObject(dir);
out.close();
}
Using this I tracked down the commit that caused serializability to break:
http://svn.apache.org/viewvc/lucene/java/trunk/src/java/org/apache/lucene/store/RAMDirectory.java?p2=%2Flucene%2Fjava%2Ftrunk%2Fsrc%2Fjava%2Forg%2Fapache%2Flucene%2Fstore%2FRAMDirectory.java&p1=%2Flucene%2Fjava%2Ftrunk%2Fsrc%2Fjava%2Forg%2Fapache%2Flucene%2Fstore%2FRAMDirectory.java&r1=478014&r2=478013&view=diff&pathrev=478014
This commit was for LUCENE-709
> 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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