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https://issues.apache.org/jira/browse/HADOOP-5596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12703944#action_12703944
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He Yongqiang commented on HADOOP-5596:
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>>I think it is not acceptable since we cannot force an EnumSet to be
>>non-empty.
We only force an EnumSet not be none when it is serialized.
If it is not ok. how about this, we require the elementType when we serialize a
non enumset? if the elementType is not provided, we throw an exception.
> Make ObjectWritable support EnumSet
> -----------------------------------
>
> Key: HADOOP-5596
> URL: https://issues.apache.org/jira/browse/HADOOP-5596
> Project: Hadoop Core
> Issue Type: Improvement
> Components: io
> Reporter: He Yongqiang
> Assignee: He Yongqiang
> Attachments: Hadoop-5596-2009-03-31.patch,
> Hadoop-5596-2009-04-03.patch, Hadoop-5596-2009-04-15-2.patch,
> Hadoop-5596-2009-04-15.patch, Hadoop-5596-2009-04-24.patch
>
>
> This is a demand for Hadoop-5438.
> Also another small improvement is that i saw that in the beginning of
> readObject, it tries to get the class from PRIMITIVE_NAMES and then conf.
> Maybe it is better to add a direct load after them if the delaredClass is
> still null. Like this:
> {code}
> String className = UTF8.readString(in);
> Class<?> declaredClass = PRIMITIVE_NAMES.get(className);
> if (declaredClass == null) {
> try {
> declaredClass = conf.getClassByName(className);
> } catch (Exception e) {
> }
> }
>
> if(declaredClass == null) {
> try {
> declaredClass = Class.forName(className);
> } catch (ClassNotFoundException e) {
> throw new RuntimeException("readObject can't find class " +
> className, e);
> }
> }
> {code}
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