File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
The moose likes Java in General and the fly likes classpaths containing wildcards Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Java » Java in General
Bookmark "classpaths containing wildcards" Watch "classpaths containing wildcards" New topic

classpaths containing wildcards

Jeanne Boyarsky
author & internet detective

Joined: May 26, 2003
Posts: 33124

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.)

[OCA 8 book] [Blog] [JavaRanch FAQ] [How To Ask Questions The Smart Way] [Book Promos]
Other Certs: SCEA Part 1, Part 2 & 3, Core Spring 3, TOGAF part 1 and part 2
Jayesh A Lalwani
Saloon Keeper

Joined: Jan 17, 2008
Posts: 2746

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

Joined: May 26, 2003
Posts: 33124

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

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.
I agree. Here's the link:
subject: classpaths containing wildcards
It's not a secret anymore!