Incompatibility between Mina and Android Lollipop

[vineet garg]

Hi,

All issues regarding ssl not working are solved now. In MINA ssl client was
causing much problem, without throwing any exception. In Netty too ssl
client caused problems but this time Netty threw an exception. On searching
around the cause of exception I came to know that there is a bug in Android
OpenSSL library which is affects Android Lollipop 5.0 [1]. So I downloaded
a Lollipop 5.1 image, and everything worked like a charm. So ssl will not
work in Android 5.0

I am not happy with using MINA either for ssl, it does not provide much
functionality. I can't even attach a handshake completed listener. Netty on
the other hand has a nice implementation and much power and also a huge
community is developing it and using it. Also lot of people also argue that
Netty is better than MINA even author himself .
Since it is started by same person, much of the functionality is alike in
Netty. I guess it will just take a day or two to port the existing code
from MINA to Netty for LanLinkProvider. Also due to the standardization of
network protocols, it should work with earlier devices as well.
What is the severity of crash that you posted earlier? If it is severe, I
consider that we should go for Netty.

[1] Bug in Lollipop
https://code.google.com/p/android-developer-preview/issues/detail?id=1521
[2] Netty vs Mina
http://stackoverflow.com/questions/1637752/netty-vs-apache-mina

Cheers
Vineet

On Thu, Jun 18, 2015 at 1:45 AM, Albert Vaca <albertvaka at gmail.com> wrote:

> Hi Yuri,
>
> Thanks for your input. Mina might be used as well in the SFTP plugin, but
> it is also used as a networking library, to send and receive all network
> messages.
>
> Albert
>
>
> On Wed, Jun 17, 2015 at 12:52 PM, Yuri Samoilenko <kinnalru at gmail.com>
> wrote:
>
>> Hello.
>>
>> I'am not watching for KDE connect carefully(and I dont know how Mina is
>> used now), but Mina was added by me as simple embedable ssh-server. So if
>> there is another ssh-server implementation of ssh-server for Java it can be
>> used as drop-in replacement. There is a very few lines of code to
>> instantiate ssh-server with Mina so migration must be simple.
>>
>> 2015-06-17 3:10 GMT+03:00 Albert Vaca <albertvaka at gmail.com>:
>>
>>> Hi Vineet,
>>>
>>> Some issues are always to be expected when developing something, but we
>>> will need to overcome them!
>>>
>>> I didn't know about Netty at all, but if you think it is going to solve
>>> the problem and it's better than Mina, go for it. Actually, I'm not supper
>>> happy with Mina because most crashes from KDE Connect come from a weird
>>> issue that involves Mina [1].
>>>
>>> If you go for Netty, that is going to require more effort than initially
>>> expected, so take it into account so you still meet your project deadlines.
>>> The most challenging part will be to make sure that devices running the old
>>> version of the app (Mina) and devices running the new one (Netty) are able
>>> to talk to each other, so either make sure that you can also have Netty
>>> without SSL (best solution), or simply keep Mina and Netty at the same time
>>> in different Links (less optimal solution).
>>>
>>> In any case, I would raise the problem with SSL in Mina and Lollipop
>>> online (Mina's mailing list?) to see if more people also had trouble and
>>> know if there is a solution (because we might end up having more problems
>>> with Netty and we have to fall back to Mina again).
>>>
>>> Let us know about your findings on this topic.
>>>
>>> [1] Most common crash in KDE Connect: https://paste.ee/r/6wt4y
>>>
>>> Albert
>>>
>>>
>>> On Tue, Jun 16, 2015 at 3:20 PM, vineet garg <grgvineet at gmail.com>
>>> wrote:
>>>
>>>> After a lot of trouble I came to this conclusion that Mina and Android
>>>> Lollipop are not compatible at all when using SSL filter. I used the filter
>>>> as described in documentation. As soon as SSL filter is applied over the
>>>> session, the CPU usage of the application becomes incredibly high causing
>>>> OS to suspend all threads, so it doesn't work at all. It didn't worked
>>>> earlier in emulator too because I was using Lollipop in emulator too. My
>>>> new physical device is on Lollipop too. My old device is on Jellybean and
>>>> it works fine on it. In emulator too, it works fine on Jellybean image. The
>>>> main reason may be because of ART, but not sure.
>>>>
>>>> So now I have two options, either implement this from basic like in KDE
>>>> version, or use Netty instead. Both Netty and Mina was started by same
>>>> person, Netty was started to overcome some of the problems in Mina. Netty
>>>> is actively developed and a lot of people are working on it.
>>>>
>>>> Vineet
>>>>
>>>>
>>>> _______________________________________________
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>>>> KDEConnect at kde.org
>>>> https://mail.kde.org/mailman/listinfo/kdeconnect
>>>>
>>>>
>>>
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>>>
>>>
>>
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>
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