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Java Applet Size Reduction

Posted on 1998-09-19
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Last Modified: 2008-01-16
I'm desperate to reduce the size of my Java Applet.  I have taken all the measures I can think of (Jar & cab file formats, snipped all dead code, using a "Release" (not debug) build, etc), but I'm wondering if there's something non-obvious that I could do to my code that would reduce it's size?
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Question by:sniles
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Author Comment

by:sniles
ID: 1224631
I think you misunderstood my question.  I am trying to reduce the size of the JAR, CAB and ZIP file containing the class files.
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Expert Comment

by:triso
ID: 1224633
Hi,

Exactlly how large is "too large?"  Do you have lots of small class files or just  a few large ones?


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Author Comment

by:sniles
ID: 1224634
I have several large classes, then about a dozen smaller ones.  Ideally, I'd like to reduce it's size by 20%.  It's currently about 120kb uncompressed, about 54kb when compressed in a .cab file.  If I could get a 30kb .cab file, I'd be quite happy.
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Accepted Solution

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mjenkins earned 50 total points
ID: 1224635
I assume that the reason you are asking is to reduce the download, and thereby startup, time. May I suggest that if you've already optimised as best you can, split the cab/jar/zip files into smaller units. Use the -verbose option to watch the order that classes are loaded when your applet is running. Then split the cab files up so that your initial download is as small as possible to get something on the screen.

Typically, users are much more inclined to cut you slack (time-wise) once they see the first screen.
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Author Comment

by:sniles
ID: 1224636
So you're saying that splitting up the cab/jar/zip files will allow the applet's screen elements to display prior to the point when the "Applet Started" message?  I have noticed that during the loading, the "Applet loaded" and "Applet initialized" messages are output (in the Java Console), then several more classes are loaded, then the "Applet Started" message is finally displayed.  To display the screen earlier, I can cut those classes that follow the "Applet Initialized"  off into a seperate jar/cab/zip? and just add that zip as a second archive= param, and a second <param name=cabbase value="myapp1.cab,myapp2.cab">  ?
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