NPE due to activation.getDeclarationValue( declId )

Trying to access the declarations and their values of an activation, as used during ActivationEvent logging:

List<String> declIds = );
for( String declId: activation.getDeclarationIDs( )

{ Object declVal = activation.getDeclarationValue( declId ); // ... }

If, however, a fact is retracted, this code, when executed for an AfterActivationFiredEvent, throws a NPE when declId is a binding for a component of the retracted fact.

The optimum solution would be to not get such useless bindings in the List<String> returned by getDeclarationIDs() which is in AgendaItem.java. I have added the if-statement. The following code is untested:

public List<String> getDeclarationIDs() {
Declaration[] declArray = this.getRule().getDeclarations();
List<String> declarations = new ArrayList<String>();
for( Declaration decl : declArray ) {
// return only "sound" declaration IDs
if( this.tuple.get( decl ).getObject() != null )

{ declarations.add( decl.getIdentifier() ); }

}
return Collections.unmodifiableList( declarations );
}