[rules-users] Error deserializing Knowledge Package in Drools 5.5.0

[Narkha]

Hello

I'm getting an exception  when adding a Collection<KnowledgePackage> after
read it from a file with readObject()

java.lang.NullPointerException
	at java.lang.Class.isAssignableFrom(Native Method)
	at
org.drools.base.ClassObjectType.isAssignableFrom(ClassObjectType.java:180)
	at
org.drools.reteoo.builder.PatternBuilder.attachPattern(PatternBuilder.java:95)
	at org.drools.reteoo.builder.PatternBuilder.build(PatternBuilder.java:80)
	at
org.drools.reteoo.builder.GroupElementBuilder$AndBuilder.build(GroupElementBuilder.java:112)
	at
org.drools.reteoo.builder.GroupElementBuilder.build(GroupElementBuilder.java:70)
	at
org.drools.reteoo.builder.ReteooRuleBuilder.addSubRule(ReteooRuleBuilder.java:161)
	at
org.drools.reteoo.builder.ReteooRuleBuilder.addRule(ReteooRuleBuilder.java:134)
	at org.drools.reteoo.ReteooBuilder.addRule(ReteooBuilder.java:113)
	at org.drools.reteoo.ReteooRuleBase.addRule(ReteooRuleBase.java:445)
	at org.drools.common.AbstractRuleBase.addRule(AbstractRuleBase.java:952)
	at
org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:629)
	*at org.drools.reteoo.ReteooRuleBase.addPackages(ReteooRuleBase.java:472)*
	at
org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:149)
	at
andanta.conversacion.DroolsEmpresa.readKnowledgeBaseFromMemoryFile(DroolsEmpresa.java:304)
	at
andanta.comunicacion.ServidorMR.cargaInfoConocimiento(ServidorMR.java:483)
	at andanta.test.Tester.main(Tester.java:127)

The code for serialize the object is 
	ObjectOutputStream out = new ObjectOutputStream( new FileOutputStream(
fileName ) );
	out.writeObject( kbuilder.getKnowledgePackages());
	out.close();

And the code for deserialize is 
	ObjectInputStream in = new ObjectInputStream( new FileInputStream(
fileName) );
	Collection<KnowledgePackage> kpkgs =
(Collection<KnowledgePackage>)in.readObject();
	in.close();
	kbase = KnowledgeBaseFactory.newKnowledgeBase();
	kbase.addKnowledgePackages( kpkgs );

My environment  is eclipse 3.7, java 7.0.21 y drools 5.5.0.

I thought this error may be due to a rule, but if I run
kbase.addKnowledgePackages after reading the rules from drl file, there will
be no exception.

Best Regards.



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