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https://issues.apache.org/jira/browse/LANG-1488?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16926594#comment-16926594
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Joerg Schaible commented on LANG-1488:
--------------------------------------

This is normal behaviour. A HashMap is also declared as serializable, but is 
not restricted to serializable objects. The same applies for Pair. If you want 
to serialize a Pair, you have to ensure yourself that its members are 
serializable.

> Possible serialization failed
> -----------------------------
>
>                 Key: LANG-1488
>                 URL: https://issues.apache.org/jira/browse/LANG-1488
>             Project: Commons Lang
>          Issue Type: Bug
>          Components: lang.tuple.*
>            Reporter: Silence Tai
>            Priority: Major
>             Fix For: 4.0
>
>
> *Pair* fails to properly constrain the generic parameters, requiring them to 
> implement the *Serializable* interface, which may cause serialization to fail.
> Example:
> {code:java}
> static class A { }
> @Test
> public void testSerialization() throws Exception {
>         final ImmutablePair<A, String> origPair = ImmutablePair.of(new A(), 
> "foo");
>         final ByteArrayOutputStream baos = new ByteArrayOutputStream();
>         final ObjectOutputStream out = new ObjectOutputStream(baos);
>         out.writeObject(origPair);
>         out.close();
>         baos.close();
> }
> {code}



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