(1:) Inject DeploymentContextual information from Deployment 1 during in container testing operating under Deployment 2 (2:) Lazy create the Deployments in order, so Deployment 2 can depend on Contextual Data from Deployment 1

ContextualDeploymentFromDifferentContainer.java

@RunWith(Arquillian.class)
public class ContextualDeploymentFromDifferentContainer
{
   @Deployment(name = "Dep-1") @TargetsContainer("Cont-1") 
   public static WebArchive create()
   {
      return ShrinkWrap.create(WebArchive.class)
         .addClass(RESTServlet.class);
   }
   
   @Deployment(name = "Dep-2") @TargetsContainer("Cont-2") 
   public static WebArchive createDep()
   {
      return ShrinkWrap.create(WebArchive.class);
   }

   @Test @OperateOnDeployment("Dep-2")
   public void shouldInvokeContainer1FromContainer2(@ArquillianResource(RESTServlet.class) @OperateOnDeployment("Dep-1") URL restURLBase)
   {
      ...
   }
}

LazyContextualDeploymentCreation.java

@RunWith(Arquillian.class)
public class LazyContextualDeploymentCreation
{
   @Deployment(name = "Dep-1") @TargetsContainer("Cont-1") 
   public static WebArchive create()
   {
      return ShrinkWrap.create(WebArchive.class)
         .addClass(RESTServlet.class);
   }
   
   @Deployment(name = "Dep-2") @TargetsContainer("Cont-2") 
   public static WebArchive createDep(@ArquillianResource(RESTServlet.class) @OperateOnDeployment("Dep-1") URL restURLBase)
   {
      return ShrinkWrap.create(WebArchive.class)
              .addAsWebInfResource(new StringAsset(
                    Descriptors.create(WebAppDescriptor.class)
                       .contextParam("external.rest.url", restURLBase.toExternalForm());
              ));
   }
}