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https://issues.apache.org/jira/browse/COLLECTIONS-220?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Neidhart updated COLLECTIONS-220:
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Fix Version/s: (was: 4.0)
> Serialization/Deserialization doesn't work well with empty buffers.
> -------------------------------------------------------------------
>
> Key: COLLECTIONS-220
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-220
> Project: Commons Collections
> Issue Type: Bug
> Components: Buffer
> Affects Versions: 3.2
> Reporter: Jose Luis Huertas
> Priority: Minor
> Attachments: ASF.LICENSE.NOT.GRANTED--SerializationTest.java,
> COLLECTIONS-200.patch, COLLECTIONS-220.patch
>
>
> When I serialize the queue to disk an it has elements, all works ok, but when
> I serialize an empty queue I have some problems when I create a new object
> using the serialized file.
> When I deserialize the queue it has a 'buffer' with size 1 (with null
> content), 'tail' and 'head' fields are 0 (they are declared transient). So,
> when I try to add a new object to the queue, the sentence:
> Object[] tmp = new Object[((buffer.length - 1) * 2) + 1];
> Is executed in the add() method to increase the buffer length, but the buffer
> remains with the same size! (buffer.length = 1 --> (1 - 1) * 2 + 1 = 1). So,
> the object is added and when the tail is going to be incremented, it is reset
> to 0!!
> private int increment(int index) {
> index++;
> if (index >= buffer.length) {
> index = 0;
> }
> return index;
> }
> So it is impossible to add new elements after an empty queue has been
> serialized / deserialized.
> I attach a simple TestCase where this is proved. The example works when you
> use XMLEncoder to serialize the buffer but doesn't work if you use
> ObjectOutputStream or XStream.
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