Easy shrink method

Contests 4K Game Competition - 2013
#1

Hello,
I want to contribute to the current 4K contest.

My jar is 6.819 Bytes big. I am doing this at the moment with little success:

[quote]pack200 --repack fourK.jar
pack200 fourK.jar.pack.gz fourK.jar
[/quote]
The result is 4.420 Bytes.

All the shrinking tools seem to be offline :frowning:

Please help me, thanks guys :slight_smile:

#2

Try JShrink.

#3

I already tried to download it, but the download link is broken

http://www.e-t.com/jshrink.zip

#4

use evaluation (the link work):

http://www.e-t.com/jshrinkevaljar.zip

Or proguard :

Or both if you need !

#5

Thanks for your help :smiley:

It worked out very well :smiley:
First I used Jshrinker, than pack200. Now I got a shrink.pack.gz file. How do I test my applet if it still works?

???

#6

I use the method described here:

Using all those steps on my jar, I reduce the final output from 6.962 bytes to 3.860 bytes.

To test a pack200ed jar you have to setup a webserver and use the packEnabled parameter.


<applet code="A.class" archive="game.pack.gz" width="495" height="450" >
< param name="java_arguments" value="-Djnlp.packEnabled=true" />
#7

I tried it your way, but I get errors after the 3rd step with the jarg.jar.

But the jshrinker does the job anyway, but I it won’t run in the browser, although I added the params to the applet tag. It says no G.class found… :frowning:

Whats wrong there?

My steps

	
<object type="application/x-java-applet" height="600" width="800">
	  <param name="code" value="G.class" />
	  <param name="archive" value="game.pack.gz" />
	  <param name="java_arguments" value="-Djnlp.packEnabled=true"/>
	  Applet failed to run.  No Java plug-in was found.
	</object>
#8

Did you try your packed applet on a distant webserver ?

#9

reducing the target to 1.5 will save you 300-400 bytes in final jar.

#10

I’ll do some self-promoting here for this. I have collected the different techniques at shrinking my game jars down into a Mercurial project, which can be downloaded here:


hg clone http://groboutils.hg.sourceforge.net:8000/hgroot/groboutils/java4k

There’s a readme file that will (hopefully) walk you through the setup steps.

#11

@StephR:
Yes I tried, and still ClassNotFoundException. I tried letting the Jshrink step out. Still not better. The applet cannot be started trough the webbrowser.

@teletubo:
Thanks for that :slight_smile: helped a bit

#12

I only used pack200 with the following options:
–effort=9
–no-keep-file-order
–strip-debug

That worked for me, now the packed “Fuego” has approx 3.700 instead of 4200 bytes…

#13

Kronos, can you report accurately all the errors you get on or after the 3rd step described by SimonH ?

Even better, report also here everything you type on the command line.

Actually, you did it…

#14

Use Proguard+Pack200, I get 40k files down to 4k

#15

I’m getting desperate :frowning:

I only used eclipse export, than pack200 with mentioned options:

–effort=9
–no-keep-file-order
–strip-debug

and this HTML5 object Tag:


	<object type="application/x-java-applet" height="600" width="800">
	  <param name="code" value="G.class" />
	  <param name="archive" value="jar/game.pack.gz" />
	  <param name="java_arguments" value="-Djnlp.packEnabled=true"/>
	</object>

also with cache_archive. I’ve seen this several times.

Please help me :slight_smile: I want to submit today :o

P.S.: the applet without pack200’ing it, runs very well in the browser with the object tag.

#16

you did read what I said that you have to set it up in a real webserver ?
You cannot simply create a .html page with this code and double click it. It will not work .

In any case, just submit it and keep trying to set it up on your computer. The approval process takes 1 or 2 days anyway, and by then you’ll know if it works or not.

I myself submitted my pack200ed without testing it. If the pure jar works in your machine, pretty much likely it will run pack200 in the java4k site.

#17

Here is the applet-html-snippet from my entry on java4k, maybe that helps?


<applet code="Fuego.class" archive="fuego.pack.gz" width="800" height="600">
   <param name="java_arguments" value="-Djnlp.packEnabled=true" />
</applet>
#18

I uploaded it on my website, and nothing happened. I hope the guys from 4K know better to handle that thing :smiley: I really hope :wink:

Thank you all for your patience :wink:

#19

I updated the my Java4k tools to include a trivial HTTPD server that knows how to handle pack200 file requests.

If you want to play along without downloading the whole package and getting it running, here’s the simple guide:

  1. Download the source from here: http://groboutils.hg.sourceforge.net/hgweb/groboutils/java4k/raw-file/28651c630d4f/tools/src/net/sf/groboutils/java4k/httpd/NanoHTTPD.java
  2. (optional) Remove the package line to make the simple guide easier.
  3. Compile NanoHTTPD.java
  4. Put a simple html file named “index.html” and your pack200 compressed applet (named *.jar.pack.gz) in an empty directory. For the html page, something simple like this works (replace the attributes in caps with the actual value; notice that the archive name ends in “.jar”):

<html><body><applet ARCHIVE="x.jar" CODE="M.class" WIDTH="200" HEIGHT="400">
</applet></body></html>
  1. Run the NanoHTTPD class like: “java -cp . NanoHTTPD -p 8080 -d (directory of html and pack.gz file)”
  2. Point your web browser to “http://localhost:8080/”
#20

Kronos, did you try to unpack and test locally the resulting jar in a standard applet code ?

Input file : game.pack
Command line>unpack200 game.pack game.pack.test.jar  
Output file : game.pack.test.jar