pack200 .gz file unpack and create .jar file in browser(speed test).

**maheshsardar** · 08-03-2010, 12:51 PM

I have to test the speed after loading the .gz file in browser and I am having java applet based web application(Hello word) whose HelloWorld.jar file size is 743byets and using pack200 tool compressed to .gz(321 bytes)files.

1) created HelloWorld.java file

Java Code:

 import java.applet.Applet;
    import java.awt.Graphics;
 
    public class HelloWorld extends Applet {
        public void paint(Graphics g) {
            g.drawString("Hello word!", 50, 25);
        }
    }

Created HelloWorld123.jar file with this class

2)Main html file hello.html

XML Code:

 <HTML>
    <head>
    <meta HTTP-EQUIV="Pragma" CONTENT="no-cache">
    <meta HTTP-EQUIV="Expires" CONTENT="-1">
  <meta HTTP-EQUIV="accept-encoding" CONTENT="gzip,deflate">
  <meta http-equiv="content-type" content="text/html"> 
  </head>
 
    <BODY>
 
    Here is the output of my program:
       <APPLET CODE    = "HelloWorld.class" ARCHIVE = "HelloWorld123.jar" WIDTH   = "200" HEIGHT  = "50">
        <param name="java_arguments" value="-Djnlp.packEnabled=true"/>
</APPLET>
 
    </BODY>
    </HTML>

3)First time tried to load the class file from the jar file it works fine(HelloWorld.class is loading in the browser).

XML Code:

 <APPLET CODE    = "HelloWorld.class" ARCHIVE = "HelloWorld123.jar" WIDTH   = "200" HEIGHT  = "50">

4) created different .gz file with same jar file(pack200 tool).

HelloWorld123.gz
pack200 --gzip -E9 HelloWorld123.gz HelloWorld123.jar

HelloWorld123.jar.pack
pack200 --no-gzip -E9 HelloWorld123.jar.pack HelloWorld123.jar

HelloWorld123.jar.pack.gz
pack200 --gzip -E9 HelloWorld123.jar.pack.gz HelloWorld123.jar

and tried these files with the above html code

XML Code:

 <APPLET CODE    = "HelloWorld.class" ARCHIVE = "HelloWorld123.gz"  WIDTH   = "200" HEIGHT  = "50" >

or

XML Code:

 <APPLET CODE    = "HelloWorld.class" ARCHIVE = "HelloWorld123.jar.pack"  WIDTH   = "200" HEIGHT  = "50" >

or

XML Code:

 <APPLET CODE    = "HelloWorld.class" ARCHIVE = "HHelloWorld123.jar.pack.gz"  WIDTH   = "200" HEIGHT  = "50" >

while loading this class I found that class loader error on sun console(as follows).

Java Code:

     
liveconnect: Invoking JS method: document
liveconnect: Invoking JS method: URL
basic: Referencing classloader: sun.plugin.ClassLoaderInfo@23d275, refcount=1
basic: Added progress listener: sun.plugin.util.GrayBoxPainter$GrayBoxProgressListener@e85825
basic: Loading applet ...
basic: Initializing applet ...
basic: Starting applet ...
basic: completed perf rollup
network: Connecting [url]http://localhost:7020/designer/details/HelloWorld123.pack.gz[/url] with proxy=DIRECT
network: Connecting socket://localhost:7020 with proxy=DIRECT
network: Connecting [url]http://localhost:7020/designer/details/HelloWorld123.pack.gz[/url] with cookie "JSESSIONID=gGsmMJmbGmZhtyKTn1v2FWvcRkFhN18Dpm81R2RLM6LYvYfFLf25!-726539454"
network: Downloading resource: [url]http://localhost:7020/designer/details/HelloWorld123.pack.gz[/url]
    Content-Length: 314
    Content-Encoding: null
load: class HelloWorld.class not found.
java.lang.ClassNotFoundException: HelloWorld.class
    at sun.applet.AppletClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.applet.AppletClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.applet.AppletClassLoader.loadCode(Unknown Source)
    at sun.applet.AppletPanel.createApplet(Unknown Source)
    at sun.plugin.AppletViewer.createApplet(Unknown Source)
    at sun.applet.AppletPanel.runLoader(Unknown Source)
    at sun.applet.AppletPanel.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
basic: Exception: java.lang.ClassNotFoundException: HelloWorld.class
Ignored exception: java.lang.ClassNotFoundException: HelloWorld.class

In the About detail I can get that HelloWorld123.pack.gz or HelloWorld123.jar.gz or HelloWorld123.jar.pack.gz is downloading.

My question is will browser decompress the .gz file to .jar file internally ? or I am missing some coding for .gz file decompression ?.