Easy shrink method

[Kronos]

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:

pack200 --repack fourK.jar
pack200 fourK.jar.pack.gz fourK.jar

The result is 4.420 Bytes.

All the shrinking tools seem to be offline

Please help me, thanks guys

[davedes]

Try JShrink.

[Kronos]

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

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

Games published by our own members! Check 'em out!

[forthx]

use evaluation (the link work):

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

Or proguard :
http://proguard.sourceforge.net/

Or both if you need !

[Kronos]

Thanks for your help

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

 

[teletubo]

I use the method described here:
http://www.java-gaming.org/topics/indiespot-compression-not-working/25147/msg/217257/view.html#msg217257

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.

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

[Kronos]

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...

Whats wrong there?

My steps

javac -target 1.7 G.java
jar cvfM game.jar G.class
jshrink with standard configuration (load and save)
pack200 game.pack.gz game.jar

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<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>

[StephR]

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...

Whats wrong there?

Did you try your packed applet on a distant webserver ?

[teletubo]

 

javac -target 1.7 G.java

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

[Groboclown]

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

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:

1	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.

Games published by our own members! Check 'em out!

[Kronos]

@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 helped a bit

[BenniBanni]

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...

[StephR]

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

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...

[ClickerMonkey]

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

[Kronos]

I'm getting desperate

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

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

and this HTML5 object Tag:

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<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 I want to submit today 


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

[teletubo]

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.

[BenniBanni]

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

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

[Kronos]

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.

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

Thank you all for your patience

[Groboclown]

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"):

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<html><body><applet ARCHIVE="x.jar" CODE="M.class" WIDTH="200" HEIGHT="400"> </applet></body></html>

5. Run the NanoHTTPD class like: "java -cp . NanoHTTPD -p 8080 -d (directory of html and pack.gz file)"
6. Point your web browser to "http://localhost:8080/"

[StephR]

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

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

[forthx]

Groboclown, I try your packing scripts ant at last it work

After reading the readme and installing ant, I have to:
- use "resources/global.properties" to create a local.properties (Mandatory for the setting of "default.jdk-dir", i.e. "C:/Program Files/jdk1.7" no /bin !)
- change proguard version (I use jdk 1.7 and I solve some error using proguard 4.
- update ant-include.xml (add source="@{jdk-target}" at line 115, in javac-4k macrodef) to avoid javac warning.

Hope this help other users.

With Kzip, DeflOpt and yguard I  reduce my archive size by 200 Bytes (compared to my manual processing using proguard and pack200)!

[Kronos]

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

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

That worked, and it is even smaller. However. Does that mean my pack.gz file will work at the 4K website?
Thank you very much, I am relieved a bit 

[StephR]

Kronos, did you try this html code on a webserver to test your game.pack.gz file ? Your html page and your game.pack.gz must be into the same directory.

<html>
<body>
<applet code="G.class" archive="game.pack.gz" width="800" height="600">
<param name="java_arguments" value="-Djnlp.packEnabled=true" />
</applet>
</body>
</html>

If you did and that it failed, you should consider giving us the URL to your webserver...

[Riven]

To get an pack200 compressed jar working, you need a pack200 aware webserver.

Some idiot at Sun didn't think this through.

[StephR]

Thanks for the information, Riven. I had really no idea of this problem.

And Kronos, maybe it's time for you to submit your game at the www.java4k.com site.

[Kronos]

Why? Isn't 28.02. the last day to submit?

I still have to put some extra flavour in the game

[Riven]

the Java4K webserver is pack200 aware, and therefore can be used to verify your pack200ed applet actually works.

[pjt33]

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

Didn't you already have mine? If not it must have been someone else who was putting together a collection of resources from across the years.

[Groboclown]

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

Didn't you already have mine? If not it must have been someone else who was putting together a collection of resources from across the years.

Nope, I missed that one.  Although, over these years I've only kept a limited amount of the code posted up here.  Most of it is either refinements of other code, or one-off snippets, but it would be interesting to see it all together in one place...  Hm...