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NPE on bean data control value change

WP v.2Jun 16 2020 — edited Jun 18 2020

Hey all,

I created a simple bean data control that supports CRUD operations. I get a NPE when I attempt to change any of the values of the model, provided by the bean data control, on my JSF page. Below is the data control code and the stacktrace. Also, what are the expected return values of the methods that are automatically added when you chose to create a CRUD data control (setAttributeValue, registerDataProvider, etc)? I've looked at the Oracle documentation but couldn't find any mention on what should be returned.

Thanks in advance, I'm on Jdeveloper 12.2.1.4.

Here's my data control...

package my.model;
import java.util.ArrayList;
import java.util.List;
import oracle.binding.AttributeContext;
import oracle.binding.RowContext;
public class AsRunDataControl {
    private AsRun asrun;
    private List<Object> dirtyEntities = new ArrayList<>();
    
    public void loadAsRun(Long asrunId) throws ModelException {
        asrun = HttpUtils.get(AsRun.class, Resources.getAsRunUrl(asrunId));
    }
    
    public AsRun getAsRun() {
        return asrun;
    }
    public boolean isTransactionDirty() {
        return !dirtyEntities.isEmpty();
    }
    public void rollbackTransaction() {
        // TODO
    }
    public void commitTransaction() throws ModelException {
        // TODO
    }
    public boolean setAttributeValue(AttributeContext ctx, Object newValue) {
        dirtyEntities.add(ctx.getRowDataContainer());
                
        return true;         
    }
    public Object createRowData(RowContext p0) {
        throw new UnsupportedOperationException();
    }
    public Object registerDataProvider(RowContext p0) {
        return this;
    }
    public boolean removeRowData(RowContext p0) {
        throw new UnsupportedOperationException();
    }
    public void validate() {
    }
}

Here is the stacktrace...

java.lang.NullPointerException

at oracle.jbo.common.JboBeanUtils.getPropertyDescriptor(JboBeanUtils.java:28)

at oracle.jbo.common.JboBeanUtils.getProperty(JboBeanUtils.java:85)

at oracle.jbo.common.JboBeanUtils.getPropertyInMapOrBean(JboBeanUtils.java:270)

at oracle.adf.model.bean.DCDataRow.getDataProviderProperty(DCDataRow.java:300)

at oracle.jbo.script.ExprDef$SourceHintProperty.evaluate(ExprDef.java:155)

at oracle.jbo.ExprEval.doEvaluate(ExprEval.java:835)

at oracle.jbo.ExprEval.evaluateForRow(ExprEval.java:725)

at oracle.jbo.ExprEval.evaluateForRow(ExprEval.java:712)

at oracle.jbo.server.AttributeDefImpl.evaluateTransientExpression(AttributeDefImpl.java:2920)

at oracle.jbo.server.ViewRowStorage.getAttributeInternal(ViewRowStorage.java:2134)

at oracle.jbo.server.ViewRowImpl.getAttributeValue(ViewRowImpl.java:2353)

at oracle.jbo.server.ViewRowImpl.getAttributeInternal(ViewRowImpl.java:1026)

at oracle.jbo.server.ProgrammaticViewRowImpl.getAttributeInternalDelegation(ProgrammaticViewRowImpl.java:435)

at oracle.adf.model.bean.DCDataRow.getAttributeInternal(DCDataRow.java:291)

at oracle.jbo.server.ViewRowImpl.getAttrInvokeAccessor(ViewRowImpl.java:1116)

at oracle.jbo.server.ViewRowImpl.getAttribute(ViewRowImpl.java:1064)

at oracle.jbo.uicli.binding.JUCtrlValueBinding.internalGetAttributeValueFromRow(JUCtrlValueBinding.java:1329)

at oracle.jbo.uicli.binding.JUCtrlValueBinding.getAttributeFromRow(JUCtrlValueBinding.java:815)

at oracle.jbo.uicli.binding.JUCtrlValueBinding.getInputValueInRow(JUCtrlValueBinding.java:3221)

at oracle.jbo.uicli.binding.JUCtrlValueBinding.getInputValue(JUCtrlValueBinding.java:3067)

at oracle.jbo.uicli.binding.JUCtrlValueBinding.getInputValue(JUCtrlValueBinding.java:3057)

at oracle.adfinternal.view.faces.model.binding.FacesCtrlAttrsBinding.getInputValue(FacesCtrlAttrsBinding.java:214)

at oracle.jbo.uicli.binding.JUCtrlValueBinding.put(JUCtrlValueBinding.java:2723)

at javax.el.MapELResolver.setValue(MapELResolver.java:226)

at com.sun.faces.el.DemuxCompositeELResolver._setValue(DemuxCompositeELResolver.java:255)

at com.sun.faces.el.DemuxCompositeELResolver.setValue(DemuxCompositeELResolver.java:281)

at com.sun.el.parser.AstValue.setValue(AstValue.java:254)

at com.sun.el.ValueExpressionImpl.setValue(ValueExpressionImpl.java:294)

at com.sun.faces.facelets.el.TagValueExpression.setValue(TagValueExpression.java:131)

at org.apache.myfaces.trinidad.component.UIXEditableValue.updateModel(UIXEditableValue.java:395)

at org.apache.myfaces.trinidad.component.UIXEditableValue.processUpdates(UIXEditableValue.java:326)

at org.apache.myfaces.trinidad.component.UIXComponentBase.updateChildrenImpl(UIXComponentBase.java:1636)

at org.apache.myfaces.trinidad.component.UIXComponentBase.updateChildren(UIXComponentBase.java:1626)

at org.apache.myfaces.trinidad.component.UIXComponentBase.processUpdates(UIXComponentBase.java:1373)

at org.apache.myfaces.trinidad.component.UIXComponentBase.updateChildrenImpl(UIXComponentBase.java:1636)

at oracle.adf.view.rich.component.fragment.UIXRegion.updateChildrenImpl(UIXRegion.java:547)

at org.apache.myfaces.trinidad.component.UIXComponentBase.updateChildren(UIXComponentBase.java:1626)

at org.apache.myfaces.trinidad.component.UIXComponentBase.processUpdates(UIXComponentBase.java:1373)

at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl$UpdateModelValuesCallback.invokeContextCallback(LifecycleImpl.java:2146)

at org.apache.myfaces.trinidad.component.UIXComponentBase.invokeOnNamingContainerComponent(UIXComponentBase.java:2155)

at oracle.adf.view.rich.component.fragment.UIXRegion.invokeOnComponent(UIXRegion.java:452)