From discussion thread http://community.jboss.org/thread/170373

Folk,
I have three classes that invoke JAX-RS functionality. Partial stack trace in server logs is:

10:25:28,364 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/DTalkWeb]] (MSC service thread 1-4) Servlet /DTalkWeb threw load() exception: java.lang.NullPointerException
at org.jboss.resteasy.jsapi.ServiceRegistry.scanRegistry(ServiceRegistry.java:69) [resteasy-jsapi-2.2.1.GA.jar:]
at org.jboss.resteasy.jsapi.ServiceRegistry.<init>(ServiceRegistry.java:63) [resteasy-jsapi-2.2.1.GA.jar:]
at org.jboss.resteasy.jsapi.JSAPIServlet.scanResources(JSAPIServlet.java:76) [resteasy-jsapi-2.2.1.GA.jar:]
at org.jboss.resteasy.jsapi.JSAPIServlet.init(JSAPIServlet.java:38) [resteasy-jsapi-2.2.1.GA.jar:]

The first few lines of the JAX-RS classes look like this:

@ApplicationPath( "/api" )
@Path( "/users" )
public class EndUserUiService extends Application
{
/**

• Queries existence of a user.
• @param sUserId
• @return HTTP OK if user exists and NOT_FOUND if user does not exist
• @throws NamingException
  */
  @HEAD
  @Path( "/ {userid}

  " )
  public Response queryUserExists( @PathParam( "userid" )final String sUserId ) throws NamingException
  {
  ...

@ApplicationPath( "/api" )
@Path("/organizations")
public class OrganizationUiService
{
...
}

@ApplicationPath( "/api" )
@Path( "/adresses" )
public class AdressUiService
{
...
}