Target Unreachable -identifier 'row' resolved to null ADF_FACES-60097- Oracle ADF

"row resolved to null" in ADF Faces- is one of the most harassing bug , and still there is no proper reason or solution for it.
recently i was working in an ADF application and this error occurs. I was not able to find root cause . see this crash-

and log on console-

<LifecycleImpl> <_handleException> ADF_FACES-60098:Faces lifecycle receives unhandled exceptions in phase APPLY_REQUEST_VALUES 2
javax.el.PropertyNotFoundException: Target Unreachable, identifier 'row' resolved to null
 at com.sun.el.parser.AstValue.getTarget(Unknown Source)
 at com.sun.el.parser.AstValue.isReadOnly(Unknown Source)
 at com.sun.el.ValueExpressionImpl.isReadOnly(Unknown Source)
 at oracle.adfinternal.view.faces.renderkit.rich.EditableValueRenderer._getUncachedReadOnly(EditableValueRenderer.java:476)
 at oracle.adfinternal.view.faces.renderkit.rich.EditableValueRenderer.getReadOnly(EditableValueRenderer.java:390)
 at oracle.adfinternal.view.faces.renderkit.rich.EditableValueRenderer.wasSubmitted(EditableValueRenderer.java:345)
 at oracle.adfinternal.view.faces.renderkit.rich.EditableValueRenderer.decodeInternal(EditableValueRenderer.java:116)
 at oracle.adfinternal.view.faces.renderkit.rich.SimpleInputDateRenderer.decodeInternal(SimpleInputDateRenderer.java:72)
 at oracle.adfinternal.view.faces.renderkit.rich.LabeledInputRenderer.decodeInternal(LabeledInputRenderer.java:56)
 at oracle.adf.view.rich.render.RichRenderer.decode(RichRenderer.java:342)
 at org.apache.myfaces.trinidad.render.CoreRenderer.decode(CoreRenderer.java:292)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.__rendererDecode(UIXComponentBase.java:1334)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.decode(UIXComponentBase.java:865)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.processDecodes(UIXComponentBase.java:965)
 at org.apache.myfaces.trinidad.component.UIXEditableValue.processDecodes(UIXEditableValue.java:287)
 at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl$ApplyRequestValuesCallback.invokeContextCallback(LifecycleImpl.java:1548)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.invokeOnComponent(UIXComponentBase.java:1735)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.invokeOnChildrenComponents(UIXComponentBase.java:1627)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.invokeOnComponent(UIXComponentBase.java:1750)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.invokeOnChildrenComponents(UIXComponentBase.java:1627)
 at org.apache.myfaces.trinidad.component.UIXCollection.invokeOnComponent(UIXCollection.java:1215)
 at oracle.adf.view.rich.component.rich.data.RichTable.invokeOnComponent(RichTable.java:620)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.invokeOnChildrenComponents(UIXComponentBase.java:1627)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.invokeOnComponent(UIXComponentBase.java:1750)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.invokeOnChildrenComponents(UIXComponentBase.java:1627)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.invokeOnComponent(UIXComponentBase.java:1750)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.invokeOnChildrenComponents(UIXComponentBase.java:1627)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.invokeOnNamingContainerComponent(UIXComponentBase.java:1693)
 at oracle.adf.view.rich.component.fragment.UIXRegion.invokeOnComponent(UIXRegion.java:625)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.invokeOnChildrenComponents(UIXComponentBase.java:1627)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.invokeOnComponent(UIXComponentBase.java:1750)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.invokeOnChildrenComponents(UIXComponentBase.java:1627)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.invokeOnComponent(UIXComponentBase.java:1750)
 at org.apache.myfaces.trinidad.component.UIXDocument.invokeOnComponent(UIXDocument.java:106)
 at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:1299)
 at javax.faces.component.UIComponentBase.invokeOnComponent(UIComponentBase.java:677)
 at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:374)
 at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:204)
 at javax.faces.webapp.FacesServlet.service(FacesServlet.java:312)
 at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
 at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
 at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
 at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
 at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:173)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
 at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:122)
 at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:468)
 at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60)
 at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:468)
 at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:293)
 at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:199)
 at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
 at oracle.adf.library.webapp.LibraryFilter.doFilter(LibraryFilter.java:180)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
 at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:111)
 at java.security.AccessController.doPrivileged(Native Method)
 at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)
 at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:413)
 at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:94)
 at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:161)
 at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
 at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:136)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
 at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
 at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
 at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)
 at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)
 at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
 at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
 at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)
 at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)
 at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)
 at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
 at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)
<RegistrationConfigurator> <handleError> ADF_FACES-60096:Server Exception during PPR, #1
javax.el.PropertyNotFoundException: Target Unreachable, identifier 'row' resolved to null 

after lot of probing- finally i have fixed it, and sharing same .

Possible Causes-

• Mainly occurs in editable af:table
• Problem with Primary Key
• af:column's component's property is being used in any EL, inside or outside of table

        Exp- #{row.bindings.xyz.inputValue==0} 

• Updateable primary key, and autosubmit true

Possible Solution -

• Never use primary key as updateable column in af:table, if you have to use then remove primary key from Entity Object
• Try to validate in RowImpl instead of Expression of Table
• Surrogate Primary Key
• Avoid LOV (List of Values) on primary key
• Change Event Policy of af:table and iterator to none

    these solutions are not rules or conventions, you can only try , and may one of it will work for you

Using af:poll to refresh and push data in page and databound table in ADF

Poll component delivers poll event to server at fixed intervals, we use poll in adf as an alternative of ADS (Active Data Service), this is very simple example of pushing data to page at some fix interval.
Basically af:poll component push data to UI from server.

• This example contains a page with an af:table binded to Department VO, and I have used a poll component to refresh table periodically.

• and defined pollListener on af:poll component that sends request to server in every 4 sec, and table get refreshed

• Other approach to actively push data is ADS, but af:poll is still in use , to refresh table i have written in poll listener



        AppModuleAMImpl am = (AppModuleAMImpl)resolvElDC("AppModuleAMDataControl");

        ViewObject vo = am.getDepartment1();
        vo.executeQuery();
        i = i + 1;
        this.refreshInfo = "Data Reloaded-" + i+"  Total Row-->"+vo.getRowCount();
        AdfFacesContext.getCurrentInstance().addPartialTarget(refrshMsgBind);



• See the jspx page source code-



<?xml version='1.0' encoding='UTF-8'?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.1" xmlns:f="http://java.sun.com/jsf/core"
          xmlns:af="http://xmlns.oracle.com/adf/faces/rich">
    <jsp:directive.page contentType="text/html;charset=UTF-8"/>
    <f:view>
        <af:document title="activePushing.jspx" id="d1">
            <af:messages id="m1"/>
            <af:form id="f1">
                <af:panelBox id="pb1" showDisclosure="false" text="Active Data Pushing">
                    <f:facet name="toolbar">
                        <af:activeOutputText value="#{ActiveDataPushing.refreshInfo}" id="aot1"
                                             inlineStyle="font-weight:bold;color:red;"
                                             binding="#{ActiveDataPushing.refrshMsgBind}"/>
                    </f:facet>
                    <af:table value="#{bindings.Department1.collectionModel}" var="row"
                              rows="#{bindings.Department1.rangeSize}"
                              emptyText="#{bindings.Department1.viewable ? 'No data to display.' : 'Access Denied.'}"
                              fetchSize="#{bindings.Department1.rangeSize}" rowBandingInterval="1"
                              selectedRowKeys="#{bindings.Department1.collectionModel.selectedRow}"
                              selectionListener="#{bindings.Department1.collectionModel.makeCurrent}"
                              rowSelection="single" id="t1" styleClass="AFStretchWidth" contentDelivery="immediate">
                        <af:column sortProperty="#{bindings.Department1.hints.DepartmentId.name}" sortable="true"
                                   headerText="#{bindings.Department1.hints.DepartmentId.label}" id="c1" width="103">
                            <af:inputText value="#{row.bindings.DepartmentId.inputValue}"
                                          label="#{bindings.Department1.hints.DepartmentId.label}"
                                          required="#{bindings.Department1.hints.DepartmentId.mandatory}"
                                          columns="#{bindings.Department1.hints.DepartmentId.displayWidth}"
                                          maximumLength="#{bindings.Department1.hints.DepartmentId.precision}"
                                          shortDesc="#{bindings.Department1.hints.DepartmentId.tooltip}" id="it1"
                                          readOnly="true">
                                <f:validator binding="#{row.bindings.DepartmentId.validator}"/>
                                <af:convertNumber groupingUsed="false"
                                                  pattern="#{bindings.Department1.hints.DepartmentId.format}"/>
                            </af:inputText>
                        </af:column>
                        <af:column sortProperty="#{bindings.Department1.hints.DepartmentName.name}" sortable="true"
                                   headerText="#{bindings.Department1.hints.DepartmentName.label}" id="c2" width="107">
                            <af:inputText value="#{row.bindings.DepartmentName.inputValue}"
                                          label="#{bindings.Department1.hints.DepartmentName.label}"
                                          required="#{bindings.Department1.hints.DepartmentName.mandatory}"
                                          columns="#{bindings.Department1.hints.DepartmentName.displayWidth}"
                                          maximumLength="#{bindings.Department1.hints.DepartmentName.precision}"
                                          shortDesc="#{bindings.Department1.hints.DepartmentName.tooltip}" id="it2"
                                          readOnly="true">
                                <f:validator binding="#{row.bindings.DepartmentName.validator}"/>
                            </af:inputText>
                        </af:column>
                        <af:column sortProperty="#{bindings.Department1.hints.ManagerId.name}" sortable="true"
                                   headerText="#{bindings.Department1.hints.ManagerId.label}" id="c3" width="105">
                            <af:inputText value="#{row.bindings.ManagerId.inputValue}"
                                          label="#{bindings.Department1.hints.ManagerId.label}"
                                          required="#{bindings.Department1.hints.ManagerId.mandatory}"
                                          columns="#{bindings.Department1.hints.ManagerId.displayWidth}"
                                          maximumLength="#{bindings.Department1.hints.ManagerId.precision}"
                                          shortDesc="#{bindings.Department1.hints.ManagerId.tooltip}" id="it3"
                                          readOnly="true">
                                <f:validator binding="#{row.bindings.ManagerId.validator}"/>
                                <af:convertNumber groupingUsed="false"
                                                  pattern="#{bindings.Department1.hints.ManagerId.format}"/>
                            </af:inputText>
                        </af:column>
                        <af:column sortProperty="#{bindings.Department1.hints.LocationId.name}" sortable="true"
                                   headerText="#{bindings.Department1.hints.LocationId.label}" id="c4" width="105">
                            <af:inputText value="#{row.bindings.LocationId.inputValue}"
                                          label="#{bindings.Department1.hints.LocationId.label}"
                                          required="#{bindings.Department1.hints.LocationId.mandatory}"
                                          columns="#{bindings.Department1.hints.LocationId.displayWidth}"
                                          maximumLength="#{bindings.Department1.hints.LocationId.precision}"
                                          shortDesc="#{bindings.Department1.hints.LocationId.tooltip}" id="it4"
                                          readOnly="true">
                                <f:validator binding="#{row.bindings.LocationId.validator}"/>
                                <af:convertNumber groupingUsed="false"
                                                  pattern="#{bindings.Department1.hints.LocationId.format}"/>
                            </af:inputText>
                        </af:column>
                    </af:table>
                    <af:poll id="p1" pollListener="#{ActiveDataPushing.pollListenerActive}" interval="4000"
                             timeout="5000"/>
                </af:panelBox>
            </af:form>
        </af:document>
    </f:view>
</jsp:root>



• Run your application, and do changes from Database and see updated UI at every 4 sec. :-)

 Reloading- 26th times-

 Reloading- 33th times-

 Reloading- 40th times-

• Sample ADF Application - Download

Conditional Execution of Model (EO) level Validation- Oracle ADF

You all know about ADF model level validation , we can apply variety of validation on model (Entity Object), as for length, compare, key, regular expression, script and unique key etc.

I am not going to describe whole process for model layer validation, for detailed tutorial on EO level validation see -Dynamic (parameterize) model level validation using message token
Now see how we can execute these validation conditionally -

• When we apply unique key validation on Entity Object- this window appears-

• Now go to Validation Execution and write your condition in given box for that you want to execute validation

• Now go to Failure Handling tab and write your failure handling message, and you are done





• Now run your application and see how validation executes for your condition
• this functionality is really helpful and sometimes avoids writing lot of managed bean code