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I cant run any jar files
Joined: Jan 12, 2004
Mar 25, 2007 10:08:00
I cannot run any jar files.
I downloaded Derby today to play around with databases
I get this error all the time:
"Failed to load Main-Class manifest attribute from
why is this?
Oh and any other Jars I download is the exact same
How simple does it have to be???
Joined: Mar 21, 2007
Mar 25, 2007 11:05:00
Not every jar file is runnable.
Let's suppose that you create a set of utility classes that you would like to assemble and distribute as a jar file.
It is very probable that none of the classes contained in your jar file has a
method. Maybe it wouldn't even make any sense to have any
method in your classes.
Just to begin with, you cannot directly "run" a jar file if there is no
method to be called in any of its classes. Even if a
method exists, if you would like to run it this way:
you would need to include a
entry in the jar's manifest file.
In the case of Derby, you should read its documentation, which explains how you are supposed to use it.
It is sorta covered in the
JavaRanch Style Guide
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