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java - Drools指导决策表抛出空指针异常

转载 作者:行者123 更新时间:2023-12-01 19:53:55 27 4
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当我在kie工作台中创建引导式决策表时,执行无状态或全状态kie会话时会出现空指针异常。更具体地说,我使用drools 7,并且使用java和grizzly公开了一个简单的rest服务。当我使用简单的drl文件时,规则会正确触发并执行,但是当我将决策表部署到jar中时,我会得到NPE。

Java代码:

 public CustomerDto executeStatelessPOC(final String param,
final StatelessKieSession kSession ,final KieServices kServices) {
//Myexample is just the entry fact
InputDTO example = new InputDTO();
example.setField1(param);

CustomerDto response = new CustomerDto();
try {

KieCommands kieCommands = kServices.getCommands();
List<Command> cmds = new ArrayList<Command>();
cmds.add(kieCommands.newInsert(example));
cmds.add(kieCommands.newInsert(response, "customerResponse"));

//Execute rules with facts provided before
ExecutionResults results = kSession.execute(kieCommands.newBatchExecution(cmds));
//Get the response as part of the results
response = (CustomerDto) results.getValue("customerResponse");
return response;

} catch (Exception e) {
System.out.println("Exception e: " + e.toString());
System.out.println("Exception e: " + Arrays.toString(e.getStackTrace()));
}
return response;
}


指导决策表的源代码:

package gr.maven.test.testbuildinmaven;


//从行号开始:1
规则“第1行TestDecisionTable”
    方言“ mvel”
    什么时候
        输入:InputDTO(field1 ==“ Test1”)
    然后
        CustomerDto fact0 =新的CustomerDto();
        fact0.setCustomerMessage(“ yesss”);
        insertLogical(fact0);
结束

//从行号开始:2
规则“第2行TestDecisionTable”
    方言“ mvel”
    什么时候
        输入:InputDTO(field1 ==“ Test2”)
    然后
        CustomerDto fact0 =新的CustomerDto();
        fact0.setCustomerMessage(“ yes2”);
        insertLogical(fact0);
结束

//从行号开始:3
规则“第3行TestDecisionTable”
    方言“ mvel”
    什么时候
        输入:InputDTO(field1 ==“ Test3”)
    然后
        CustomerDto fact0 =新的CustomerDto();
        fact0.setCustomerMessage(“ yesss”);
        insertLogical(fact0);
结束

例外:

WARNING: The following warnings have been detected: WARNING: Unknown HK2 failure detected:


MultiException堆栈2之1
java.lang.ExceptionInInitializerError
        在sun.reflect.NativeConstructorAccessorImpl.newInstance0(本机方法)处
        在sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        在sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        在java.lang.reflect.Constructor.newInstance(Constructor.java:423)
        在org.glassfish.hk2.utilities.reflection.ReflectionHelper.makeMe(ReflectionHelper.java:1129)
        在org.jvnet.hk2.internal.ClazzCreator.createMe(ClazzCreator.java:274)
        在org.jvnet.hk2.internal.ClazzCreator.create(ClazzCreator.java:368)
        在org.jvnet.hk2.internal.SystemDescriptor.create(SystemDescriptor.java:471)
        在org.glassfish.jersey.process.internal.RequestScope.findOrCreate(RequestScope.java:162)
        在org.jvnet.hk2.internal.Utilities.createService(Utilities.java:2064)
        在org.jvnet.hk2.internal.ServiceLocatorImpl.internalGetService(ServiceLocatorImpl.java:711)
        在org.jvnet.hk2.internal.ServiceLocatorImpl.getService(ServiceLocatorImpl.java:653)
        在org.glassfish.jersey.internal.inject.Injections.getOrCreate(Injections.java:169)
        在org.glassfish.jersey.server.model.MethodHandler $ ClassBasedMethodHandler.getInstance(MethodHandler.java:185)
        在org.glassfish.jersey.server.internal.routing.PushMethodHandlerRouter.apply(PushMethodHandlerRouter.java:74)
        在org.glassfish.jersey.server.internal.routing.RoutingStage._apply(RoutingStage.java:109)
        在org.glassfish.jersey.server.internal.routing.RoutingStage._apply(RoutingStage.java:112)
        在org.glassfish.jersey.server.internal.routing.RoutingStage._apply(RoutingStage.java:112)
        在org.glassfish.jersey.server.internal.routing.RoutingStage._apply(RoutingStage.java:112)
        在org.glassfish.jersey.server.internal.routing.RoutingStage._apply(RoutingStage.java:112)
        在org.glassfish.jersey.server.internal.routing.RoutingStage.apply(RoutingStage.java:92)
        在org.glassfish.jersey.server.internal.routing.RoutingStage.apply(RoutingStage.java:61)
        在org.glassfish.jersey.process.internal.Stages.process(Stages.java:197)
        在org.glassfish.jersey.server.ServerRuntime $ 2.run(ServerRuntime.java:297)
        在org.glassfish.jersey.internal.Errors $ 1.call(Errors.java:271)
        在org.glassfish.jersey.internal.Errors $ 1.call(Errors.java:267)
        在org.glassfish.jersey.internal.Errors.process(Errors.java:315)
        在org.glassfish.jersey.internal.Errors.process(Errors.java:297)
        在org.glassfish.jersey.internal.Errors.process(Errors.java:267)
        在org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)
        在org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:288)
        在org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1110)
        在org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpContainer.service(GrizzlyHttpContainer.java:381)
        在org.glassfish.grizzly.http.server.HttpHandler $ 1.run(HttpHandler.java:219)
        在org.glassfish.grizzly.threadpool.AbstractThreadPool $ Worker.doWork(AbstractThreadPool.java:565)
        在org.glassfish.grizzly.threadpool.AbstractThreadPool $ Worker.run(AbstractThreadPool.java:545)
        在java.lang.Thread.run(Thread.java:748)
造成原因:java.lang.NullPointerException
        在org.drools.compiler.builder.impl.KnowledgeBuilderImpl.guidedDecisionTableToPackageDescr(KnowledgeBuilderImpl.java:411)处
        在org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl $ ResourceToPkgDescrMapper.lambda $ static $ 6(CompositeKnowledgeBuilderImpl.java:309)
        在org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.buildResource(CompositeKnowledgeBuilderImpl.java:187)
        在org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.buildPackageDescr(CompositeKnowledgeBuilderImpl.java:176)
        在org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.buildPackages(CompositeKnowledgeBuilderImpl.java:109)
        在org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.build(CompositeKnowledgeBuilderImpl.java:99)
        在org.drools.compiler.kie.builder.impl.AbstractKieProject.buildKnowledgePackages(AbstractKieProject.java:247)
        在org.drools.compiler.kie.builder.impl.AbstractKieModule.createKieBase(AbstractKieModule.java:210)
        在org.drools.compiler.kie.builder.impl.KieContainerImpl.createKieBase(KieContainerImpl.java:389)
        在org.drools.compiler.kie.builder.impl.KieContainerImpl.getKieBase(KieContainerImpl.java:357)
        在org.drools.compiler.kie.builder.impl.KieContainerImpl.newStatelessKieSession(KieContainerImpl.java:550)
        在org.drools.compiler.kie.builder.impl.KieContainerImpl.newStatelessKieSession(KieContainerImpl.java:460)
        在org.drools.compiler.kie.builder.impl.KieContainerImpl.newStatelessKieSession(KieContainerImpl.java:455)
        在com.mycompany.grizzlypoc.rest.services.StatelessService。(StatelessService.java:37)
        ...更多37
MultiException堆栈2之2
java.lang.IllegalStateException:无法执行操作:在com.mycompany.grizzlypoc.rest.services.StatelessService上创建
        在org.jvnet.hk2.internal.ClazzCreator.create(ClazzCreator.java:395)
        在org.jvnet.hk2.internal.SystemDescriptor.create(SystemDescriptor.java:471)
        在org.glassfish.jersey.process.internal.RequestScope.findOrCreate(RequestScope.java:162)
        在org.jvnet.hk2.internal.Utilities.createService(Utilities.java:2064)
        在org.jvnet.hk2.internal.ServiceLocatorImpl.internalGetService(ServiceLocatorImpl.java:711)
        在org.jvnet.hk2.internal.ServiceLocatorImpl.getService(ServiceLocatorImpl.java:653)
        在org.glassfish.jersey.internal.inject.Injections.getOrCreate(Injections.java:169)
        在org.glassfish.jersey.server.model.MethodHandler $ ClassBasedMethodHandler.getInstance(MethodHandler.java:185)
        在org.glassfish.jersey.server.internal.routing.PushMethodHandlerRouter.apply(PushMethodHandlerRouter.java:74)
        在org.glassfish.jersey.server.internal.routing.RoutingStage._apply(RoutingStage.java:109)
        在org.glassfish.jersey.server.internal.routing.RoutingStage._apply(RoutingStage.java:112)
        在org.glassfish.jersey.server.internal.routing.RoutingStage._apply(RoutingStage.java:112)
        在org.glassfish.jersey.server.internal.routing.RoutingStage._apply(RoutingStage.java:112)
        在org.glassfish.jersey.server.internal.routing.RoutingStage._apply(RoutingStage.java:112)
        在org.glassfish.jersey.server.internal.routing.RoutingStage.apply(RoutingStage.java:92)
        在org.glassfish.jersey.server.internal.routing.RoutingStage.apply(RoutingStage.java:61)
        在org.glassfish.jersey.process.internal.Stages.process(Stages.java:197)
        在org.glassfish.jersey.server.ServerRuntime $ 2.run(ServerRuntime.java:297)
        在org.glassfish.jersey.internal.Errors $ 1.call(Errors.java:271)
        在org.glassfish.jersey.internal.Errors $ 1.call(Errors.java:267)
        在org.glassfish.jersey.internal.Errors.process(Errors.java:315)
        在org.glassfish.jersey.internal.Errors.process(Errors.java:297)
        在org.glassfish.jersey.internal.Errors.process(Errors.java:267)
        在org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)
        在org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:288)
        在org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1110)
        在org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpContainer.service(GrizzlyHttpContainer.java:381)
        在org.glassfish.grizzly.http.server.HttpHandler $ 1.run(HttpHandler.java:219)
        在org.glassfish.grizzly.threadpool.AbstractThreadPool $ Worker.doWork(AbstractThreadPool.java:565)
        在org.glassfish.grizzly.threadpool.AbstractThreadPool $ Worker.run(AbstractThreadPool.java:545)
        在java.lang.Thread.run(Thread.java:748)

最佳答案

在我的POM xml中使用此依赖关系可以解决问题。

   <dependency>
<groupId>org.drools</groupId>
<artifactId>drools-workbench-models-guided-dtable</artifactId>
<version>7.7.0.Final</version>
</dependency>

关于java - Drools指导决策表抛出空指针异常,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/50256207/

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