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https://issues.apache.org/jira/browse/THRIFT-1035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12980263#action_12980263
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Bryan Duxbury commented on THRIFT-1035:
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I don't think that going back to byte[] just for collections is the way to go. 
How about, instead, we offer two sets of accessors for collections with binary 
elements: one with the ByteBuffers, and one with byte[]. Then we could make a 
wrapper list/set/map implementation that pulls the byte[] out of the 
ByteBuffers as needed.

> Container types containing binary data are parameterized with ByteBuffer in 
> the generated Java code
> ---------------------------------------------------------------------------------------------------
>
>                 Key: THRIFT-1035
>                 URL: https://issues.apache.org/jira/browse/THRIFT-1035
>             Project: Thrift
>          Issue Type: Bug
>          Components: Java - Compiler, Java - Library
>    Affects Versions: 0.4, 0.5, 0.6, 0.7
>         Environment: All
>            Reporter: Mathias Herberts
>         Attachments: THRIFT-1035-2.patch, THRIFT-1035.patch
>
>
> Since THRIFT-830, binary fields are internally handled using ByteBuffer.
> Release 0.4.0 was the first to expose the ByteBuffer to the outside world 
> (replacing previous methods returning/accepting byte[]).
> THRIFT-882 lead to the methods accepting/returning byte[] being available 
> again, as it was deemed more reasonable not to expose the ByteBuffer too much 
> as their use could be cumbersome. This lead to 0.5.0 being backward 
> compatible with 0.3.0 on the binary fields front.
> During that time, nobody noticed that container types that contained binary 
> data had their generated Java code changed to collections parameterized with 
> ByteBuffer instead of byte[].
> list<binary> -> List<ByteBuffer>
> set<binary> -> Set<ByteBuffer>
> map<binary,...> -> Map<ByteBuffer,...>
> map<...,binary> -> Map<...,ByteBuffer>
> This introduces confusion in the API and still exposes ByteBuffer when 
> discussion on THRIFT-882 concluded this should be avoided.
> We need to provide a way to offer the original parameterization with byte[] 
> as this will simplify working with that type of collection and thus will 
> increase the odds of Thrift's adoption.

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