code: protected void setVirtualHostMgr(DynamicVirtualHostManager vhostMgr) {
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled())
              Tr.debug(this, tc, "setVirtualHostMgr : DynamicVirtualHost set : " + vhostMgr.toString());  
          dynVhostMgr = vhostMgr;
      }
docs: Required static reference: called before activate