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From "Abel Salgado Romero (JIRA)" <>
Subject [jira] [Commented] (CXF-6219) Handling concurrent Base64 files causes memory overflow
Date Mon, 26 Jan 2015 13:50:34 GMT


Abel Salgado Romero commented on CXF-6219:

Thanks :), that will certainly be usefull in the future. However, currently we're just trying
to solve this doubt to decide if we should disable base64 completely.

Going back to your comment Sergey, afaik the current problem is that since Base64 travels
embedded in the XML, the whole message is parsed at some point, loading its content into memory.
The parser creates several copies of the message requiring a lot of memory.
That does not happen when dealing with MTOM because the attachment can be processed separately
and is streamed to disc instead of memory. If only the XML parser could do the same, that
is, when an attachment is detected, it should stream the Base64 to disc while parsing the

> Handling concurrent Base64 files causes memory overflow
> -------------------------------------------------------
>                 Key: CXF-6219
>                 URL:
>             Project: CXF
>          Issue Type: Improvement
>          Components: Soap Binding, WS-* Components
>    Affects Versions: 2.7.4
>         Environment: Production
>            Reporter: Abel Salgado Romero
>              Labels: documentation
> In a previous issue ( we were advised
to update CXF version to avoid OOM errors.
> We did so (to 2.74) and the problem was fixed, we also applied a size limit of 20MB using
the `org.apache.cxf.stax.maxTextLength` property.
> However, the memory consumption in the server is extremely higher than the actual data
sent, having 1GB of Heap we get OOM sending just 6 concurrent requests of 20 MB.
> Reviewing some documents and other JIRA issues, we understand that Base64 is not optimized
and not recomended. Can you confirm if this is the case or if there is a way to optimize how
Base64 attachments are processed.
> Otoh, MTOM works like a charm ;)

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