[jsword-devel] private JRE, Harmony, RCP, pack200 etc

[Zhaojun Li(李召军)]

The NSIS script

On 1/26/07, Zhaojun Li(李召军) <lzj369 at gmail.com> wrote:
> If you go to Sun's website, you will notice that the jre installer for
> JRE6 only 12mb. It uses pack200 to compress jar files. It is good at
> compressing jars. sometimes, we can get 50-80% size reduction. I think
> the bigger you jar size is, the higher you compress rate you get.
>
> Pack200 comes with JRE , depends on JRE. So when we compress, we need
> jRE installed. However, when we expand it, we use unpck200. It comes
> with jre 5 6 and is a c++ programe,. Included also a dll.
> Look at the following: the command I used to compress that JRE lib folder:
> pack200 --no-gzip --effort=9 --deflate-hint=false
> --modification-time=latest --unknown-attribute=strip  jce.pack
> jce.jar
> pack200 --no-gzip --effort=9 --deflate-hint=false
> --modification-time=latest --unknown-attribute=strip    jsse.pack
> jsse.jar
> pack200 --no-gzip --effort=9 --deflate-hint=false
> --modification-time=latest
> --unknown-attribute=strip       management-agent.pack    management-agent.jar
> pack200 --no-gzip --effort=9 --deflate-hint=false
> --modification-time=latest --unknown-attribute=strip    resources.pack
> resources.jar
> pack200 --no-gzip --effort=9 --deflate-hint=false
> --modification-time=latest --unknown-attribute=strip    -J-Xmx256m
> rt.pack                  rt.jar
> pack200 --no-gzip --effort=9 --deflate-hint=false
> --modification-time=latest --unknown-attribute=strip    -J-Xmx256m
> charsets.pack           charsets.jar
>
> (Notice that big jars need to limit the memory usage , or we get out
> of memeory error)
> to expend:
>
> jre\bin\unpack200.exe -r -q jre\lib\rt.pack             jre\lib\rt.jar
>
> This way, we can reduce the size of JRE like 50%.
> Then we use 7zip or NSIS to compress the JRE by using LZMA, thus got
> 8.7 mb jre, it contains charset.jar too.
>
> For Cross, I post the NSIS script for you here, you know what is going
> on there because I see in SVN , BD was built by NSIS too.
>
> I think java5 and java6 did a good job. Sun is trying to make it
> better very hard.
>
> Zhaojun
>
>
> On 1/26/07, DM Smith <dmsmith555 at yahoo.com> wrote:
> > Zhaojun,
> >
> > I looked at distributing the JRE with BibleDesktop as part of the
> > "Portable BibleDesktop" effort (see www.crosswire.org/~dmsmith/bd). The
> > goal here was to have it fully expanded so that it would work on a
> > CD-ROM or a USB drive on any platform. I too found that it is big.
> >
> > I would be very interested to know how you recompressed the JRE and how
> > you would expand it again upon delivery.
> >
> > As far as BibleDesktop goes, we are stuck with Sun's implementation of
> > Swing. I think that JSword or Common can use most 1.4 level JREs. I had
> > problems with IBMs JRE and I think it had to do with charsets, but I'm
> > not sure.
> >
> > The exciting part of RCP/JFace/SWT is that we could use other JREs,
> > including GNU's and Apache's.
> >
> > I read the license for Harmony and clause 4 gives us the right to
> > distribute.
> >
> > DM
> >
> > Zhaojun Li(李召军) wrote:
> > > Hi,
> > >
> > > I found that distributing java application anoying because it needs
> > > JRE on users desktop. We have no control on what on users' system.
> > >
> > > One solution is to distribute a private JRE with our application. JRE
> > > 5 and 6 are all too big. According to Sun, we have to distribute many
> > > jars that not needed at all in order to comply with the license.
> > >
> > > I removed those files that are optional in JRE , unfortunately I can
> > > not remove charset.jar because of internationalization.  I was able to
> > > comrpess JRE, RCP to a size of 9mb. Very impressive.  Still plus my
> > > plugins, the size goes to 12mb.
> > >
> > > I notice harmony has an JRE under apache license. and all the jars are
> > > modular. I am not good at apache license. Does it allow us to remove
> > > the components? I think so.
> > >
> > > I tested Eclipse on Harmony, it runs well. Apache also claims it
> > > supports eclipse.  That means we can distribute a working JRE without
> > > AWT,SWING and other components we do not need for RCP.  I expect after
> > > compression, the JRE can be like 2-4 MB.
> > >
> > > Any inputs?
> > >
> > > Zhaojun
> > >
> >
> >
> > _______________________________________________
> > jsword-devel mailing list
> > jsword-devel at crosswire.org
> > http://www.crosswire.org/mailman/listinfo/jsword-devel
> >
>
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