Java in a docker container

[Mani Sarkar]

Hi volker

Isnt the small foot print of Java with jigsaw changes going to help with
running Java in containers like environments or systems with lower
resources?

Would love to know if osgi-like runtime optimisations is also in the plans.

On Thu, 15 Dec 2016 10:00 kant kodali, <kanth909 at gmail.com> wrote:

> Thats a very good response! I do think there are Brilliant minds that are
> behind JVM and I think we should do everything possible for it to be #1. I
> honestly think JLS itself had taught me way more than my 4 year degree from
> a top school in US. Google has time and money so they can do anything. I
> don't think oracle is doing much to promote Java or open source. I guess
> they don't understand it.
>
> On Thu, Dec 15, 2016 at 1:45 AM, Volker Simonis <volker.simonis at gmail.com>
> wrote:
>
> > On Wed, Dec 14, 2016 at 11:36 PM, kant kodali <kanth909 at gmail.com>
> wrote:
> > > Hi Brian,
> > >
> > > If you think it is insufficiency of Docker then perhaps one may want to
> > > look at how things are done in other Languages such as Go and so on? I
> > just
> > > don't why Java is targeted all the time when I hear from people saying
> > "No
> > > one puts Java in a container". My mind immediately thinks is it only
> Java
> > > or any VM based language.
> >
> > I think part of the problem is that Java is one of the most
> > sophisticated VMs (and unfortunately this sometimes translates into
> > most most heavy-weight VMs :( It has two JIT compilers, several quite
> > complex GC implementations which are by far better than the ones from
> > other VM based languanges and a huge class library. This all adds up
> > to a relatively big footprint and relatively slow startup.
> >
> > For example Java was newer designed for executing something like
> > shell-scripts and the built-in ergonomics aren't designed to optimize
> > the VM for such scenarios. They are better suited for web servers or
> > heavy-weight applications like IDEs and they mostly assume they can
> > grab most of the resources of the machine they are running on.
> >
> > I think these are the reasons why other scripting or VM-based
> > languages run better "by default" in container enviroments - they
> > simple need fewer resources by default. But I think Java can be tuned
> > in the same way - we just have to do it :)
> >
> > Regards,
> > Volker
> >
> > >
> > > thanks,
> > > kant
> > >
> > >
> > > On Wed, Dec 14, 2016 at 8:48 AM, Brian Burkhalter <
> > > brian.burkhalter at oracle.com> wrote:
> > >
> > >> There are also container-related issues in Java NIO [1]. I spent a
> > >> not-insignificant amount of time on this a few months ago but a
> solution
> > >> was elusive and we let it drop for JDK 9. I am not convinced that the
> > >> fundamental problem is not due to an insufficiency of Docker itself.
> > There
> > >> are several issues linked from [1] among which the Docker-specific one
> > is
> > >> [2].
> > >>
> > >> Regards,
> > >>
> > >> Brian
> > >>
> > >> [1] http://mail.openjdk.java.net/pipermail/nio-dev/2016-
> > >> October/003915.html
> > >> [2] https://bugs.openjdk.java.net/browse/JDK-8165852
> > >>
> > >> On Dec 13, 2016, at 12:14 AM, Volker Simonis <
> volker.simonis at gmail.com>
> > >> wrote:
> > >>
> > >> > […] and there's another Enhancement request open for this topic:
> > >> >
> > >> > 8146115: physical memory does not see Docker resource limits
> > >> > https://bugs.openjdk.java.net/browse/JDK-8146115
> > >> >
> > >> > Please feel free to contribute any insights from your side to this
> > >> discussions.
> > >>
> > >>
> >
>
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