Incompatibility between Mina and Android Lollipop

Thu Jun 18 19:13:19 UTC 2015

Oh ok, so it's not in kdeconnect yet. And with just the sample you can
already reproduce the error, right?
On Jun 18, 2015 12:08 PM, "vineet garg" <grgvineet at gmail.com> wrote:

>
>
> On Fri, Jun 19, 2015 at 12:02 AM, Albert Vaca <albertvaka at gmail.com>
> wrote:
>
>> Do you have any of this code in github so I can test it this weekend?
>>
>
> Link for Netty Test : https://github.com/grgvineet/NettyTest
>
>
>> On Thu, Jun 18, 2015 at 11:12 AM, vineet garg <grgvineet at gmail.com>
>> wrote:
>>
>>>
>>>
>>> On Thu, Jun 18, 2015 at 11:33 PM, Albert Vaca <albertvaka at gmail.com>
>>> wrote:
>>>
>>>> > In Netty too ssl client caused problems but this time Netty threw an
>>>> exception.
>>>>
>>>> What's the exception that you saw with Netty that you don't see with
>>>> Mina?
>>>>
>>>
>>> The stack trace I get on 5.0 devices https://paste.kde.org/p7pgfrl5i
>>>
>>> Also, does this mean that you have Netty already implemented? Is it
>>>> working without SSL as well?
>>>>
>>>
>>> I earlier developed a little application for testing of ssl connections
>>> on Android on which I can test ssl server and ssl client. I modified that
>>> application to work with netty based on netty examples.
>>>
>>>>
>>>> > So ssl will not work in Android 5.0
>>>>
>>>> That doesn't sound great. Make it work without 5.0 first, but
>>>> afterwards we will need a workaround for this.
>>>>
>>>> > What is the severity of crash that you posted earlier?
>>>>
>>>> I see around 5 reported crashes a week.
>>>>
>>>>
>>>> On Jun 18, 2015 7:41 AM, "vineet garg" <grgvineet at gmail.com> wrote:
>>>>
>>>>> 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
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> KDEConnect mailing list
>>>>>>>>> KDEConnect at kde.org
>>>>>>>>> https://mail.kde.org/mailman/listinfo/kdeconnect
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> KDEConnect mailing list
>>>>>>>> KDEConnect at kde.org
>>>>>>>> https://mail.kde.org/mailman/listinfo/kdeconnect
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> KDEConnect mailing list
>>>>>>> KDEConnect at kde.org
>>>>>>> https://mail.kde.org/mailman/listinfo/kdeconnect
>>>>>>>
>>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> KDEConnect mailing list
>>>>>> KDEConnect at kde.org
>>>>>> https://mail.kde.org/mailman/listinfo/kdeconnect
>>>>>>
>>>>>>
>>>>>
>>>
>>
>
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