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

I can confirm that adding a PackageDescr to PackageBuilder works with drools-4.0.7 but throws a NullPointerException with Drools 5.0 & Drools 5.1.0.M1 DeepakA wrote: > > 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 > > > > > >