Description of problem:
When modifying (or setting) the resource and metric for the Resource Metric Graph portlet on the Dashboard, the user is able to enter any value they like. The result is the dashboard becomes inactive/unusable and does not load and produced the following message in the message center:

Message :	Globally uncaught exception
Severity :	Error
Detail :	

java.lang.NumberFormatException:For input string: "app"
--- STACK TRACE FOLLOWS ---
For input string: "app"
   at Unknown.java_lang_NumberFormatException_$NumberFormatException__Ljava_lang_NumberFormatException_2Ljava_lang_String_2Ljava_lang_NumberFormatException_2(Unknown source:0)
   at Unknown.java_lang_Number__1_1parseAndValidateInt__Ljava_lang_String_2IIII(Unknown source:0)
   at Unknown.org_rhq_enterprise_gui_coregui_client_dashboard_portlets_inventory_resource_graph_ResourceGraphPortlet_$configure__Lorg_rhq_enterprise_gui_coregui_client_dashboard_portlets_inventory_resource_graph_ResourceGraphPortlet_2Lorg_rhq_enterprise_gui_coregui_client_dashboard_PortletWindow_2Lorg_rhq_core_domain_dashboard_DashboardPortlet_2V(Unknown source:0)
   at Unknown.org_rhq_enterprise_gui_coregui_client_dashboard_portlets_inventory_resource_graph_ResourceGraphPortlet_configure__Lorg_rhq_enterprise_gui_coregui_client_dashboard_PortletWindow_2Lorg_rhq_core_domain_dashboard_DashboardPortlet_2V(Unknown source:0)
   at Unknown.org_rhq_enterprise_gui_coregui_client_dashboard_PortletFactory_buildPortlet__Ljava_lang_String_2Lorg_rhq_enterprise_gui_coregui_client_dashboard_PortletWindow_2Lorg_rhq_core_domain_dashboard_DashboardPortlet_2Lorg_rhq_core_domain_common_EntityContext_2Lorg_rhq_enterprise_gui_coregui_client_dashboard_Portlet_2(Unknown source:0)
   at Unknown.org_rhq_enterprise_gui_coregui_client_dashboard_PortletWindow_onInit__V(Unknown source:0)
   at Unknown.com_smartgwt_client_widgets_BaseWidget_doInit__V(Unknown source:0)
   at Unknown.com_smartgwt_client_widgets_Window_create__Lcom_google_gwt_core_client_JavaScriptObject_2(Unknown source:0)
   at Unknown.com_smartgwt_client_widgets_BaseWidget_$getOrCreateJsObj__Lcom_smartgwt_client_widgets_BaseWidget_2Lcom_google_gwt_core_client_JavaScriptObject_2(Unknown source:0)
   at Unknown.com_smartgwt_client_widgets_layout_Layout_$addMember__Lcom_smartgwt_client_widgets_layout_Layout_2Lcom_smartgwt_client_widgets_Canvas_2V(Unknown source:0)
   at Unknown.org_rhq_enterprise_gui_coregui_client_dashboard_PortalLayout_$addPortletWindow__Lorg_rhq_enterprise_gui_coregui_client_dashboard_PortalLayout_2Lorg_rhq_enterprise_gui_coregui_client_dashboard_PortletWindow_2ILorg_rhq_enterprise_gui_coregui_client_dashboard_PortalColumn_2(Unknown source:0)
   at Unknown.org_rhq_enterprise_gui_coregui_client_dashboard_DashboardView_$loadPortletWindows__Lorg_rhq_enterprise_gui_coregui_client_dashboard_DashboardView_2V(Unknown source:0)
   at Unknown.org_rhq_enterprise_gui_coregui_client_dashboard_DashboardView_$buildPortlets__Lorg_rhq_enterprise_gui_coregui_client_dashboard_DashboardView_2V(Unknown source:0)
   at Unknown.org_rhq_enterprise_gui_coregui_client_dashboard_DashboardView_onInit__V(Unknown source:0)
   at Unknown.com_smartgwt_client_widgets_BaseWidget_doInit__V(Unknown source:0)
   at Unknown.com_smartgwt_client_widgets_layout_VLayout_create__Lcom_google_gwt_core_client_JavaScriptObject_2(Unknown source:0)
   at Unknown.com_smartgwt_client_widgets_BaseWidget_$getOrCreateJsObj__Lcom_smartgwt_client_widgets_BaseWidget_2Lcom_google_gwt_core_client_JavaScriptObject_2(Unknown source:0)
   at Unknown.org_rhq_enterprise_gui_coregui_client_dashboard_DashboardsView_$updateDashboards__Lorg_rhq_enterprise_gui_coregui_client_dashboard_DashboardsView_2Ljava_util_List_2V(Unknown source:0)
   at Unknown.org_rhq_enterprise_gui_coregui_client_dashboard_DashboardsView$1$1_onPermissionsLoaded__Ljava_util_Set_2V(Unknown source:0)
   at Unknown.org_rhq_enterprise_gui_coregui_client_PermissionsLoader$1_onSuccess__Ljava_lang_Object_2V(Unknown source:0)
   at Unknown.com_google_gwt_user_client_rpc_impl_RequestCallbackAdapter_$onResponseReceived__Lcom_google_gwt_user_client_rpc_impl_RequestCallbackAdapter_2Lcom_google_gwt_http_client_Request_2Lcom_google_gwt_http_client_Response_2V(Unknown source:0)
   at Unknown.org_rhq_enterprise_gui_coregui_client_util_rpc_TrackingRequestCallback_onResponseReceived__Lcom_google_gwt_http_client_Request_2Lcom_google_gwt_http_client_Response_2V(Unknown source:0)
   at Unknown.com_google_gwt_http_client_Request_$fireOnResponseReceived__Lcom_google_gwt_http_client_Request_2Lcom_google_gwt_http_client_RequestCallback_2V(Unknown source:0)
   at Unknown.com_google_gwt_http_client_RequestBuilder$1_onReadyStateChange__Lcom_google_gwt_xhr_client_XMLHttpRequest_2V(Unknown source:0)
   at Unknown.anonymous(Unknown source:0)
   at Unknown.com_google_gwt_core_client_impl_Impl_entry0__Ljava_lang_Object_2Ljava_lang_Object_2Ljava_lang_Object_2Ljava_lang_Object_2(Unknown source:0)
   at Unknown.anonymous(Unknown source:0)
   at Unknown.anonymous(Unknown source:0)


Version-Release number of selected component (if applicable):
JON 3.1.0

How reproducible:
Always

Steps to Reproduce:
1. Add a Resource Metric Graph portlet to the Dashboard
2. Edit the portlet settings and instead of selecting a Resource from the resource list, type in a resource name or any arbitrary value (such as abc) which is not a number
3. Enter any numeric value for Metric (this can also be any non numeric value and the same error will occur)
4. Save the changes
  
Actual results:
After the portlet settings have been saved, the Dashboard no longer loads and the message center indicated "Globally uncaught exception"

Expected results:
The save of the portlet settings should fail due to invalid data (or perhaps the edit field should now allow manually input)