Hi,

I'm using drools 4.0.1. I'm first adding one package to my RuleBase object,
and everything works just fine:

...
builder.addPackageFromDrl(new InputStreamReader(resource.getInputStream()));

if(ruleBase == null) {
        ruleBase = RuleBaseFactory.newRuleBase();
}
ruleBase.addPackage (builder.getPackage());


But after some time i need to refresh my rules, so i'm using following code
to remove previous package:

ruleBase.removePackage("org.sample.mypackage");

and i'm getting the following error:

java.lang.NullPointerException
        at org.drools.reteoo.ReteooBuilder.removeRule(ReteooBuilder.java:222)
        at org.drools.reteoo.ReteooRuleBase.removeRule(ReteooRuleBase.java:272)
        at
org.drools.common.AbstractRuleBase.removePackage (AbstractRuleBase.java:460)
        at
com.diosphere.diomedia.common.drools.impl.RulesServiceImpl.refresh(RulesServiceImpl.java:121)
        at
com.diosphere.diomedia.service.impl.PromotionManagerImpl.refreshDRLs (PromotionManagerImpl.java:39)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at uk.ltd.getahead.dwr.impl.ExecuteQuery.execute(ExecuteQuery.java:170)
        at
uk.ltd.getahead.dwr.impl.DefaultProcessor.doExec (DefaultProcessor.java:552)
        at
uk.ltd.getahead.dwr.impl.DefaultProcessor.handle(DefaultProcessor.java:88)
        at uk.ltd.getahead.dwr.DWRServlet.doPost(DWRServlet.java:178)
        at javax.servlet.http.HttpServlet.service (HttpServlet.java:710)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at
com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118)
        at
com.opensymphony.module.sitemesh.filter.PageFilter.doFilter (PageFilter.java:52)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java :206)
        at
net.sf.acegisecurity.util.FilterChainProxy.doFilter(FilterChainProxy.java:167)
        at
net.sf.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:120)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (ApplicationFilterChain.java:235)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java :230)
        at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
        at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
        at
org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:104)
        at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
        at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
        at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run (JIoEndpoint.java:447)
        at java.lang.Thread.run(Thread.java:619)

Does anyone have a clue what might be the problem, and how to fix it?
Kind regards!
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