Question

我计划使用FactTemplate而不是POJO基于JSON有效负载创建动态对象，但是在知识库中插入事实org.drools.core.facttemplates.Fact时出现错误。

java.lang.NullPointerException在 org.drools.core.phreak.PropagationEntry $ Insert.execute（PropagationEntry.java:134）在 org.drools.reteoo.common.RetePropagationList.addEntry（RetePropagationList.java:36）在 org.drools.core.impl.StatefulKnowledgeSessionImpl.addPropagation（StatefulKnowledgeSessionImpl.java:2095）在 org.drools.reteoo.common.ReteWorkingMemory.addPropagation（ReteWorkingMemory.java:238）在 org.drools.core.reteoo.EntryPointNode.assertObject（EntryPointNode.java:225）在 org.drools.core.common.NamedEntryPoint.insert（NamedEntryPoint.java:278）在 org.drools.core.common.NamedEntryPoint.insert（NamedEntryPoint.java:239）在 org.drools.core.impl.StatefulKnowledgeSessionImpl.insert（StatefulKnowledgeSessionImpl.java:1535）在 org.drools.reteoo.common.ReteWorkingMemory.insert（ReteWorkingMemory.java:285）在 org.drools.core.impl.StatefulKnowledgeSessionImpl.insert（StatefulKnowledgeSessionImpl.java:1481）在 org.drools.impl.adapters.KnowledgeRuntimeAdapter.insert（KnowledgeRuntimeAdapter.java:263）在com.pexa.au.DroolsMain.main（DroolsMain.java:100）

这是我的代码：

InternalKnowledgePackage pkg = new KnowledgePackageImpl("test");
final FieldTemplate ft = new FieldTemplateImpl( "person",
                0,
                String.class );

final FieldTemplate[] fields1 = new FieldTemplate[]{ft};

final FactTemplate factTemplate = new FactTemplateImpl( pkg,
                "PersonDetails",
                fields1 );


 final Fact personFact = factTemplate.createFact( 10 );
 personFact.setFieldValue( "person",
       "NAMEE!!" );

 ksession.insert(personFact);

 ksession.fireAllRules();

任何建议将不胜感激！：）

使用Fact对象时出现Drools ksession.insert错误

0 个答案: