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From "Sebb (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CODEC-96) Base64 encode() method is no longer thread-safe, breaking clients using it as a shared BinaryEncoder
Date Tue, 20 Mar 2012 11:45:40 GMT

    [ https://issues.apache.org/jira/browse/CODEC-96?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13233362#comment-13233362
] 

Sebb commented on CODEC-96:
---------------------------

I think it might be possible to move the mutable fields out of the lower level classes and
back into the streaming classes which are the ones that actually need them.

Whether it is possible to do this in a compatible way, I don't yet know, but I'd like to give
it a try over then next week or so.
                
> Base64 encode() method is no longer thread-safe, breaking clients using it as a shared
BinaryEncoder
> ----------------------------------------------------------------------------------------------------
>
>                 Key: CODEC-96
>                 URL: https://issues.apache.org/jira/browse/CODEC-96
>             Project: Commons Codec
>          Issue Type: Bug
>    Affects Versions: 1.4
>            Reporter: Matt Ryall
>            Assignee: Julius Davies
>             Fix For: 1.x
>
>         Attachments: codec-96-3rd-attempt.patch
>
>
> Streaming support was added to Base64 in commons-codec 1.4 with CODEC-69. This introduced
instance variables to Base64 which means the class can no longer be used as a shared BinaryEncoder
instance.
> For example, BinaryEncoder has an interface which could be (and was) used like this with
Base64:
> {code:java}
> class Example {
>     private BinaryEncoder encoder = new Base64();
>     byte[] someMethod(byte[] data) {
>         try {
>             return encoder.encode(data);
>         }
>         catch (EncoderException e) {
>             throw new RuntimeException(e);
>         }
>     } 
> }
> {code}
> Base64 is no longer thread-safe in commons-codec 1.4, so code like the above which is
accessed by multiple threads can throw NullPointerException:
> {noformat}
> java.lang.NullPointerException
> 	at org.apache.commons.codec.binary.Base64.encode(Base64.java:469)
> 	at org.apache.commons.codec.binary.Base64.encode(Base64.java:937)
> 	at ... (application code)
> {noformat}
> Looking at the implementation of Base64, I think making it thread-safe for this kind
of usage would be quite tricky. I haven't attempted to prepare a patch.
> I would be happy if it was indicated in the Javadoc that Base64 is not thread-safe and
should not be shared. However, some other users of commons-codec might be more worried about
this regression.

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