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classpaths containing wildcards

Jeanne Boyarsky
author & internet detective
Marshal

Joined: May 26, 2003
Posts: 30780
    
157

On Friday, I noticed that starting Java 6, command line classpaths can contain wildcards.

This is very cool! (and about time.) It's helpful when distributing a command line program. Especially with Maven since the jars contain version #s and change often.

(no this isn't a question; I hadn't known about the feature so wanted to post.)


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Jayesh A Lalwani
Bartender

Joined: Jan 17, 2008
Posts: 2409
    
  28

Yeah I was happy when I saw that too. Actually, I forgot that Java didn't support wildchars, and I put wildchars in the classpath by mistake. I ran it, it worked, then I remembered Java doesn't support wildchars. That's when I "discovered" these feature
Jeanne Boyarsky
author & internet detective
Marshal

Joined: May 26, 2003
Posts: 30780
    
157

I was actually looking for whether -cp "commons-io-*;commons-lang-*" was legal so I could at least leave out the version numbers. And found I could specify the whole directory in one go!
Rupesh Bonthala
Greenhorn

Joined: Mar 08, 2007
Posts: 5
yep. nice feature. One important point is that if the order of jars in the folder is important for the application, then wild cards shouldn't be used as the order of loading of Jars may vary for each execution.
 
It is sorta covered in the JavaRanch Style Guide.
 
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