[rules-users] Parent ClassLoader may not be null

[abhay_bc]

Hi
I am writing a drools based app. I am getting this error when I create an
instance of KnowledgeBuilder

at line, 

KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();


Here is the error. Can anyone tell what does this error mean ?

java.lang.NullPointerException: Parent ClassLoader may not be null
   at java.lang.ClassLoader.<init>(ClassLoader.java:239)
   at java.lang.ClassLoader.<init>(ClassLoader.java:226)
   at
org.drools.util.CompositeClassLoader.<init>(CompositeClassLoader.java:38)
   at
org.drools.util.ClassLoaderUtil.getClassLoader(ClassLoaderUtil.java:27)
   at
org.drools.compiler.PackageBuilderConfiguration.setClassLoader(PackageBuilderConfiguration.java:333)
   at
org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:165)
   at
org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:159)
   at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:210)
   at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:143)
   at
Org.drools.builder.impl.KnowledgeBuilderFactoryServiceImpl.newKnowledgeBuilder(KnowledgeBuilderFactoryS
   at
org.drools.builder.KnowledgeBuilderFactory.newKnowledgeBuilder(KnowledgeBuilderFactory.java:47)
   at com.ts.DBconnector.readKnowledgeBase(DBconnector.java:125)
   

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