El Exception - attemp to coerce a value

Question

I need to perform some arithmatic operation on the value which is from a vo. I tried the below code for it.
"#{(bindings.XxWorkExpDetailsVO1ExperienceMonths mod '2')}"
But am getting the exception
javax.faces.el.EvaluationException: com.sun.faces.el.impl.ElException: Attempt to coerce a value of type "oracle.adfinternal.view.faces.model.binding.FacesCtrlAttrsBinding" to type "java.lang.Long"
I tried by removing single quotes also. But getting the same error. Kindly help.

Answer 1

Hi,
it all boils down to knowing what you do.
1. #{bindings.XxWorkExpDetailsVO1ExperienceMonths} accesses an attribute binding. This is not a scalar type nor can it converted to one
2. "#{bindings.XxWorkExpDetailsVO1ExperienceMonths.inputValue} accesses the exposed value of an attribute binding. If its a numeric value in ADF BC then either its BigDecinal (11.1.2) or oracle jbo.domain.Number (11.1.1.x)
3. If it is oracle.jbo.domain.Number then this object has a method "longValue" to cast it to type long. So your expression - in theory - need to be #{bindings.XxWorkExpDetailsVO1ExperienceMonths.inputValue.longValue}. This however doesn't work with EL because EL value expressions look for properties and not methods.
The solution to your problem is like explained in this thread
https://forums.oracle.com/forums/thread.jspa?threadID=717868
Create a managed bean to perform the calculation
{code}
long calculatedVal;
public void setCalculatedVal(long v){}
public long getCalculatedVal(){
BindingContext bctx = BindingContext.getCurrent();
BindingContainer bindings = bctx.getCurrentBindingsEntry();
AttributeBinding expMonth = (AttributeBinding) bindings.get("XxWorkExpDetailsVO1ExperienceMonths");
long attrValue = ((oracle.jbo.domain.Number)expMonth.getInputValue()).longValue();
return (attrValue % 2);
{code}
You then reference the managed bean property #{bean.calculatedVal} in your page
Frank