java.lang.RuntimeException

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    • java.lang.RuntimeException: java.lang.NullPointerException at org.drools.core.rule.SingleAccumulate.accumulate(SingleAccumulate.java:90) at org.drools.core.phreak.PhreakAccumulateNode.addMatch(PhreakAccumulateNode.java:759) at org.drools.core.phreak.PhreakAccumulateNode.doLeftInserts(PhreakAccumulateNode.java:163) at org.drools.core.phreak.PhreakAccumulateNode.doNode(PhreakAccumulateNode.java:80) at org.drools.core.phreak.RuleNetworkEvaluator.switchOnDoBetaNode(RuleNetworkEvaluator.java:562) at org.drools.core.phreak.RuleNetworkEvaluator.evalBetaNode(RuleNetworkEvaluator.java:533) at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:334) at org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:161) at org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:116) at org.drools.core.phreak.RuleExecutor.reEvaluateNetwork(RuleExecutor.java:235) at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:106) at org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1016) at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1302) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1289) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1262) at com.sample.DroolsTest1.main(DroolsTest1.java:20) Caused by: java.lang.NullPointerException at org.drools.core.rule.Declaration.getValue(Declaration.java:228) at com.sample.Rule_rule11017979978AccumulateExpression0Invoker.evaluate(Rule_rule11017979978AccumulateExpression0Invoker.java:19) at org.drools.core.base.accumulators.JavaAccumulatorFunctionExecutor.accumulate(JavaAccumulatorFunctionExecutor.java:109) at org.drools.core.rule.SingleAccumulate.accumulate(SingleAccumulate.java:82) ... 15 more
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