[rules-users] Dynamic Fact(field) Generation in Declarative Model

[srinivasasanda]

Hi All,
Please help on this issue
I created a declarative model Person in personDetails package in Drools
Gunvor with 2 fields(age,amount).Now,I need to insert one field with name
gender and datatype String into that declarative model through POJO
class..Here is my code

RuleAgent agent = RuleAgent.newRuleAgent("/Guvnor.properties");
		RuleBase rb = agent.getRuleBase();
		 WorkingMemory workingMemory = rb.newStatefulSession();
		 PackageBuilder pkgBuilder=new PackageBuilder(rb);
	FactType personType = rb.getFactType( "persondetails.Person" );
	ClassDefinition cDefinition=(ClassDefinition)
rb.getFactType("persondetails.Person");
FieldDefinition gen = new FieldDefinition( "gender",
	"java.lang.String" );
	product.setKey(true);
	cDefinition.addField(product);
	workingMemory.insert(cDefinition);
	FactHandle fc=workingMemory.getFactHandle(cDefinition);
	workingMemory.update(fc, cDefinition);
rb.newStatelessSession().execute(new Object[] {cDefinition}); 
}
String s1=cDefinition.getField(0).getTypeName();
String name1=cDefinition.getField(0).getName();
System.out.println(s1);
System.out.println(name1);
String s2=cDefinition.getField(1).getTypeName();
String name2=cDefinition.getField(1).getName();
System.out.println(s2);
System.out.println(name2);
String s3=cDefinition.getField(2).getTypeName();
String name3=cDefinition.getField(2).getName();
System.out.println(s3);
System.out.println(name3);

Output as Age---Java.lang.Integer
Amount-java.lang.Integer
Gender--Java.lang.String..
And when i am printing 
It is executing successfuly first time without errors.but i could not find
gender in declarative model.It is failed to inserting.Can anyone help me in
this..plZzzzzz...I was struggling with this....

When Iam executing second time it is displaying as Exception:couldnot find
gender in declarative model..It means iam unable to commit Data into
Server..(Drools guvnor Model)

Please help on this....



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