[jboss-dev-forums] [Design of POJO Server] - Re: VirtualFile.toURL() returning vfsfile:

[bill.burke@jboss.com]

Found out some things about classloading and URLClassLoader:

* a sun URLClassPath class is used to get .class files as a resource
* If the URL ends in '/' a "directory" based approach seems to be used and the URLClassPath class concatenates the resource name to the base URL to open the file.

So, when a resource is looked up it will do 

vfsfile:/foo.jar/org/jboss/SomeClass.class

to find the resource.

My current guess is that JarFile's are not reentrant nor threadsafe.  I took a look at truezip, but it is currently totally based upon java.io.File and a real file system.  So you can't just pass in any old URL to get access to the JAR file.



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