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https://issues.apache.org/jira/browse/COLLECTIONS-721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16891559#comment-16891559
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Yoshiyuki Ohtake commented on COLLECTIONS-721:
----------------------------------------------
InvokerTransformerクラスからSerializableの実装を外したことが原因です。
JavaDocコメントでは脆弱性対応のためとあります。
> functors.InvokerTransformer backward incompatibility bug
> --------------------------------------------------------
>
> Key: COLLECTIONS-721
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-721
> Project: Commons Collections
> Issue Type: Bug
> Affects Versions: 4.1, 4.2, 4.3
> Reporter: xia0c
> Priority: Major
> Labels: performance
>
> The following code snippets throw a NotSerializableException. It works well
> before commons-collections4 4.0 and commons-collection3. When I update it to
> 4.1 or newer versions, it failed.
> {code:java}
> @Test
> public void Demo() throws IOException{
> InvokerTransformer transformer = new
> InvokerTransformer("toString", new Class[]{}, new Object[]{});
> Queue priorityQueue = new PriorityQueue(2, new
> TransformingComparator(transformer));
> priorityQueue.add(1);
>
> ByteArrayOutputStream bout = new ByteArrayOutputStream();
> ObjectOutputStream out = new ObjectOutputStream(bout);
> out.writeObject(priorityQueue);
>
> }
> {code}
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