Exception "llegalArgumentException: Null path " occured

[sunls]

I deployed a seam2's application in JBoss AS 7. Exception "llegalArgumentException: Null path " occured.

java.lang.IllegalArgumentException: Null path

    at org.jboss.vfs.VFS.getChild(VFS.java:187) [jboss-vfs-3.1.0.Final.jar:3.1.0.Final]

    at org.jboss.vfs.VFS.getChild(VFS.java:173) [jboss-vfs-3.1.0.Final.jar:3.1.0.Final]

    at org.jboss.vfs.VFS.getChild(VFS.java:154) [jboss-vfs-3.1.0.Final.jar:3.1.0.Final]

    at org.jboss.seam.integration.jbossas.vfs.VFSScanner.getRoot(VFSScanner.java:36) [jboss-seam-int.jar:6.0.0.GA]

    at org.jboss.seam.integration.jbossas.vfs.VFSScanner.scanResources(VFSScanner.java:114) [jboss-seam-int.jar:6.0.0.GA

I made a module my.service. The module have a resource my_service.jar. In my_service.jar's root path, there is a seam.properties file.

So  seam search seam.properties, my_service.jar is found. But,  url is like:

jar:file:/D:/opt/jboss-as-7.1.0.Final/modules/kss/service/main/kss_services.jar!/seam.properties

In VFS.getChild method, url.toURI().getPath() is null. "llegalArgumentException: Null path " occured. Why is getPath() method's return null?

[sunls]

In JarFileResourceLoader＃getJarURI method , file's URI is created by "new URI("jar", b.toString(), null)".

The value of b.toString() is liking "file:/D:/opt/jboss-as-7.1.0.Final/modules/kss/service/main/kss_services.jar!/seam.properties".

But the getPath() of URI that is created is null. Is this a bug?

Is there any approach to avoid the error?