[rules-users] exception while adding a packageDescr to a PackageBuilder

[DeepakA]

I am trying to add a rule to a package.
First I create a PackageDescr, then I create a RuleDescr 
and set some properties in it

com.deepak.development.Trade class is loaded into the working memory before
I try to create this rule

Upon doing a DrlDump, I get the following (which is correctly formed; if I
copy paste this in a drl file, the rule gets executed as expected)


rule "Added new Rule" 
	 when
		trade : com.deepak.development.Trade(  )

	 then
System.out.println("Whatever");end


//////////////////////////
// CODE
//////////////////////////


//Create a PackageDescr
//packages[0] is the package that is already available, 
//since I create a new PackageDescr with same name, 
//I expect the new rule to be appended to the existing package

final PackageDescr packageDescr = new PackageDescr(new
Package(packages[0].getName()).getName());

//Create a RuleDescr		
	
RuleDescr ruleDescr = new RuleDescr("Added new Rule"); 
String consequence = "System.out.println(\"Whatever\");";
AndDescr lhs = new AndDescr(); 
ruleDescr.setLhs( lhs );
						
final PatternDescr pattern = new PatternDescr(
com.deepak.development.Trade.class.getName(),"trade");
lhs.addDescr( pattern );
ruleDescr.setConsequence( consequence );
            
PackageBuilder builder = new PackageBuilder(packages[0]); 
packageDescr.addRule( ruleDescr );
                        
DrlDumper drlDumper = new DrlDumper();
System.out.println("Dumping Package Descriptor for all rules: "+
drlDumper.dump(packageDescr)); 

//Nullpointer Exception caught
builder.addPackage(packageDescr);
ruleBase.addPackage(builder.getPackage());


Doing a debug in eclipse I can see that a NullPointerException is caught in
the line ###builder.addPackage(packageDescr)###

Is there any other property I need to set in packageDescr before it can be
added to a builder?
I can see the following in the debug section of eclipse 

PackageStore.read(String) line: 58

The following is shown in the Variables side (in eclispe debug mode)
[corresponds to PackageStore]


this	PackageStore  (id=13923)	
	errors	ArrayList<E>  (id=15898)	
		elementData	Object[10]  (id=19840)	
		modCount	0	
		size	0	
	javaDialectRuntimeData	null	
resourceName	"java/lang/Object.class" (id=13925)	
	count	22	
	hash	0	
	offset	0	
	value	 (id=15896)	
clazz	null	





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