Hi Joerg,

well, indeed :/ This is clearly a copy/past error...

It's sad that the unit tests didn't caught the obvious error.

We are good for a patch and a release...


Many thanks for the report!

On 6/8/26 20:31, Joerg Michelberger wrote:
Hello all,
inspecting the CompressionFilter change, introduced in 2.2.8, it seems that
there crept in a cut and paste error in the initialisation of the Zlib used
for deflate. It is literally the same initialization as for the inflate.
See:
https://github.com/apache/mina/blob/2.2.X/mina-filter-compression/src/main/java/org/apache/mina/filter/compression/CompressionFilter.java#L280

In 2.2.7 is the inflate Zlib initialized with Zlib.MODE_INFLATER and the
deflate with Zlib.MODE_DEFLATE.
In 2.2.8 are both with Zlib.MODE_INFLATER.
I do not think that this is the intention.

Same on 2.0.x and 2.1.x branches.

Regards
Jörg


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