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https://issues.apache.org/jira/browse/WW-4383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14085840#comment-14085840
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Lukasz Lenart commented on WW-4383:
-----------------------------------
Is it something that can happened during processing Http request or what?
> An infinite loop occurs in FastByteArrayOutputStream.java.
> -----------------------------------------------------------
>
> Key: WW-4383
> URL: https://issues.apache.org/jira/browse/WW-4383
> Project: Struts 2
> Issue Type: Bug
> Components: Core Actions
> Affects Versions: 2.3.16.3
> Reporter: Suzuki Yoshifumi
> Priority: Minor
> Fix For: 2.3.18
>
> Original Estimate: 672h
> Remaining Estimate: 672h
>
> An infinite loop occurs in FastByteArrayOutputStream.java.
> The conditions which an infinite loop generates are as follows.
> - The character code of input data is UTF-8.
> - The length of input data is longer than 16 KB.
> - There is a character of a surrogate pair after 16 KB of input data.
> - Example of input data:
> The input data to reproduce repeats 3 bytes of character 5462 times, and the
> character of a surrogate pair appears behind that.
> - Cause
> Is clean of the out buffer necessary for decodeAndWritw method after the
> output in an out buffer?
> {code:java}
> private static CoderResult decodeAndWrite(Writer writer, ByteBuffer in,
> CharBuffer out, CharsetDecoder decoder, boolean endOfInput) throws
> IOException {
> CoderResult result = decoder.decode(in, out, endOfInput);
> // To begin of decoded data
> out.flip();
> // Output
> writer.write(out.toString());
> return result;
> }
> {code}
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