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output a webapps classpath

David Sheltby
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Joined: Oct 19, 2011
Posts: 34
Is it possible to output (to stdout or logs) the classpath for a webapp?

thanks!
Paul Clapham
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Joined: Oct 14, 2005
Posts: 18991
    
    8

Let's back up a step: why would you want to do that?
Bear Bibeault
Author and ninkuma
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Joined: Jan 10, 2002
Posts: 61766
    
  67

There really isn't a class path -- at least not in the same sense as the command line. What are you actually trying to accomplish?


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David Sheltby
Ranch Hand

Joined: Oct 19, 2011
Posts: 34
I'm getting a ClassNotFoundException for a class which is in the web-inf/classes directory. I wanted to confirm that its actually loaded.
Paul Clapham
Bartender

Joined: Oct 14, 2005
Posts: 18991
    
    8

It appears you spelled the name of that directory wrong. It should be "WEB-INF/classes", not "web-inf/classes".
Bear Bibeault
Author and ninkuma
Marshal

Joined: Jan 10, 2002
Posts: 61766
    
  67

Anything that's in WEB-INF/classes will be loaded (and yes, case counts!). You don't need any further affirmation on that.

If you are having problems with a class, the problem is with the class or your package structure, not with the container.
David Sheltby
Ranch Hand

Joined: Oct 19, 2011
Posts: 34
It is WEB-INF/classes. Thats not the problem. I will have to look into the class more. The package structure appears to be correct. Even decompiling the class to verify the package confirms this.
Tim Holloway
Saloon Keeper

Joined: Jun 25, 2001
Posts: 16305
    
  21

Bear Bibeault wrote:There really isn't a class path -- at least not in the same sense as the command line. What are you actually trying to accomplish?


Well, actually, there is. And, as a matter of fact I have found it necessary to dump the classpath of a webapp once or twice. It's not that hard if you chase down the proper JavaDocs.

There isn't a single classpath in a J2EE system. Depending on context, the classpath varies, and in particular, each webapp has its own unique classpath - which includes the WEB-INF/classes and contents of the WEB-INF/lib directories of that app's WAR. And, since a WAR in the strict sense is a ZIP file, that should immediately ring the alarm that not all webapp classpath entries may be discrete filesystem paths. But, like I said, there is a classpath and I've had the questionable good fortune to have had to dissect it once or twice.

As a quick solution, I recommend invoking Class.forName on the "missing" class. You can set a debugger breakpoint there and chase into the whole sordid process.


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