package com.sample;

import java.util.Map;
import java.math.BigDecimal;
import com.sample.Cart;
import com.sample.Product;
import com.sample.Context;

import com.sample.CartDiscountAction;

query accumulate_query(Cart $v1, Product $v2)
   (
      not (
         $v2 := Product(leftQuantity >= Integer.valueOf(1))
         and
         $v1 := Cart(products contains $v2)
         and
         (
            $v2 := Product(code == "20000" || categoryCodes contains "20000")
         )
      )
      and
      (
         $v2 := Product(price >= new BigDecimal("300"), leftQuantity >= Integer.valueOf(1))
         and
         $v1 := Cart(products contains $v2)
      )
   )
end

rule "testProductAction"

dialect "mvel"
no-loop false
salience 0
when
      (
      not (
         $rao_v2 := Product(leftQuantity >= Integer.valueOf(1))
         and
         exists (Cart(products contains $rao_v2))
         and
         (
            $rao_v2 := Product(code == "20000" || categoryCodes contains "20000")
         )
      )
      and
      (
         $rao_v2 := Product(price >= new BigDecimal("300"), leftQuantity >= Integer.valueOf(1))
         and
         exists (Cart(products contains $rao_v2))
      )
   )
   $v1 := Cart()
   accumulate (
      accumulate_query($v1, $v2;)
   ;
      $v1_set : collectSet($v1),
      $v2_set : collectSet($v2),
      $result_count : count(1)
   )
   $action := CartDiscountAction()
   eval($result_count > 0)
then
   Map variables = [
      "com.sample.Cart" : $v1_set,
      "com.sample.Product": $v2_set
   ];
   $action.execution(new Context(variables, kcontext));
end
 

java.lang.NullPointerException: Cannot invoke "org.kie.api.runtime.rule.FactHandle.getObject()" because "fh" is null
    at org.drools.base.rule.Declaration.getValue(Declaration.java:231)
    at org.drools.base.rule.Declaration.getValue(Declaration.java:227)
    at org.drools.base.rule.accessor.TupleValueExtractor.getValue(TupleValueExtractor.java:26)
    at org.drools.base.util.FieldIndex.indexedValueOf(FieldIndex.java:79)
    at org.drools.core.util.AbstractHashTable$SingleIndex.hashCodeOf(AbstractHashTable.java:234)
    at org.drools.core.util.index.TupleIndexHashTable.getOrCreate(TupleIndexHashTable.java:395)
    at org.drools.core.util.index.TupleIndexHashTable.add(TupleIndexHashTable.java:357)
    at org.drools.core.phreak.PhreakJoinNode.doLeftInserts(PhreakJoinNode.java:95)
    at org.drools.core.phreak.PhreakJoinNode.doNode(PhreakJoinNode.java:71)
    at org.drools.core.phreak.RuleNetworkEvaluator.switchOnDoBetaNode(RuleNetworkEvaluator.java:576)
    at org.drools.core.phreak.RuleNetworkEvaluator.evalBetaNode(RuleNetworkEvaluator.java:562)
    at org.drools.core.phreak.RuleNetworkEvaluator.evalNode(RuleNetworkEvaluator.java:389)
    at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:349)
    at org.drools.core.phreak.RuleNetworkEvaluator.doRiaNode(RuleNetworkEvaluator.java:634)
    at org.drools.core.phreak.RuleNetworkEvaluator.evalBetaNode(RuleNetworkEvaluator.java:557)
    at org.drools.core.phreak.RuleNetworkEvaluator.evalNode(RuleNetworkEvaluator.java:389)
    at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:349)
    at org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:185)
    at org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:143)
    at org.drools.core.phreak.RuleExecutor.evaluateNetwork(RuleExecutor.java:221)
    at org.drools.kiesession.agenda.DefaultAgenda.evaluateEagerList(DefaultAgenda.java:501)
    at org.drools.kiesession.agenda.DefaultAgenda.fireLoop(DefaultAgenda.java:618)
    at org.drools.kiesession.agenda.DefaultAgenda.internalFireAllRules(DefaultAgenda.java:571)
    at org.drools.kiesession.agenda.DefaultAgenda.fireAllRules(DefaultAgenda.java:563)
    at org.drools.kiesession.session.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1088)
    at org.drools.kiesession.session.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1079)
    at org.drools.kiesession.session.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1063)
    at com.sample.NotOperationTest.testProductExist(NotOperationTest.java:59)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
......