back port fix from JBSEAM-4316-Classloader cannot find XML files in multiple WARs

I have an EAR that contains multiple WAR files. The first webapp to be accessed works fine. Any web request to the 2nd WAR to be accessed causes the following error:

WARN [VFSScanner] Error handling item 'login/index.page.xml': java.lang.NullPointerException: Cannot find URL from classLoader for login/index.page.xml, loading from org.jboss.web.tomcat.service.WebCtxLoader$ENCLoader@1ed964f

FileDescriptor.java calls:

Resources.getResource(name, ServletLifecycle.getServletContext());

Which returns a static reference to the ServletContext which is overwritten by the last webapp to be initialized.

private static ServletContext servletContext;

public static ServletContext getServletContext()

{ //don't throw an exception if null, because of unit tests return servletContext; }

The 2nd webapp to be initialized will have a reference to the first webapp's ServletContext.