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Making a JAR file.

 
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what is a Jar file, what is the significance of that file?
How can one make a Jar file?

How does a JAR help in making a .exe file?

can any one explain me in detail, or can provide me with some links that can explain about this in detail?
 
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Try,
http://www.devx.com/tips/Tip/13397
http://java.sun.com/j2se/1.4.2/docs/guide/jar/jar.html

-Lave
 
Bharadwaj Adepu
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I am trying to make a jar file,

i've created a manifest file and trying to add it to the jar but
am getting an exception like
java.io.IOException: invalid header field name: Main-Class

what is the reason? what was the mistake?
 
It is sorta covered in the JavaRanch Style Guide.
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