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Re: Jigsaw

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Arne Vajhøj <arne@vajhoej.dk> Wrote in message:
> On 4/24/2017 11:15 AM, Eric Douglas wrote:
>> On Monday, April 24, 2017 at 10:44:28 AM UTC-4, Arne Vajhøj wrote:
>>> Java classes are loaded when they are needed, so I would assume no
>>> changes to classes loaded.
>>>
>>> In theory it should be possible to create a JRE subset with only
>>> some modules.
>>>
>>> I don't think the Java license permits it.
>>>
>>> I don't think there is much point. Given todays network speeds and
>>> disk sizes the JRE is relative small.
>>>
>>> I assume they have done the split for the same reasons other would
>>> want to use the module system. To decouple things better and make
>>> it easier to maintain.
>>
>> http://openjdk.java.net/projects/jigsaw/
>>
>> The first stated goal was to scale down to fit a Java on smaller
>> devices.  I'm not sure how much space a JRE takes up or what sort of
>> devices you'd need to be able to fit just part of the JRE.
> 
> I believe a full JRE is still less than 200 MB. Should not be
> a problem in EE or SE world.
> 
> But maybe there is a case in embedded (SE Embedded) space.
> 
>> I'm not sure if this "jigsaw" is the same JRE classes broken up to
>> different jars, or how this accomplishes the other stated goals of
>> improving security, maintainability, and application performance.
> 
> The modular split and the dependency management can certainly
> improve things for large systems.
> 
> Arne
> 
> 

Yes, for limited systems (mobile phones, set-top boxes, smart
 cards)
both the file size and the amount of memory (both stack
 and heap) used by the JRE form prohibitive factors.
 
  
I love these programming quizzes that ask, how many objects does
 this program create? How much memory does this structure use? It
 pales in comparison to how many objects the JRE or the SDK
 generate just to live, and how much memory they allocate, with
 maybe only a memory monitor running. 
  
I do hope that Jigsaw forces core java to separate class loading
 between concerns, so I can, for instance, totally remove
 java.xml, if my application doesn't use xml, or allows me to
 replace a default  implementation of some interface entirely with
 a competing one. 

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Re: Jigsaw Arne Vajhøj <arne@vajhoej.dk> - 2017-04-20 21:37 -0400
  Re: Jigsaw omegajunior <omegajunior@protonmail.com> - 2017-04-24 08:45 -0400
    Re: Jigsaw Arne Vajhøj <arne@vajhoej.dk> - 2017-04-24 10:44 -0400
      Re: Jigsaw Eric Douglas <e.d.programmer@gmail.com> - 2017-04-24 08:15 -0700
        Re: Jigsaw Arne Vajhøj <arne@vajhoej.dk> - 2017-04-24 11:29 -0400
          Re: Jigsaw Arne Vajhøj <arne@vajhoej.dk> - 2017-04-24 11:29 -0400
          Re: Jigsaw omegajunior <omegajunior@protonmail.com> - 2017-04-26 18:32 -0400
            Re: Jigsaw Arne Vajhøj <arne@vajhoej.dk> - 2017-04-26 19:49 -0400
        Re: Jigsaw Eric Sosman <esosman@comcast-dot-net.invalid> - 2017-04-24 11:51 -0400
          Re: Jigsaw omegajunior <omegajunior@protonmail.com> - 2017-04-26 18:37 -0400
            Re: Jigsaw Arne Vajhøj <arne@vajhoej.dk> - 2017-04-26 19:49 -0400
            Re: Jigsaw Eric Sosman <esosman@comcast-dot-net.invalid> - 2017-04-27 07:42 -0400

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