如何在风暴拓扑中使用drools

Question

现在我想在一个印迹中使用Drools，它在LocalCluster中正常工作，但是当我把它放到生产集群时，它有错误。印迹是：

public class DealLostBolt extends BaseRichBolt {

      private static final long serialVersionUID = 1L;

      private static final Logger LOGGER = LoggerFactory.getLogger("DEAL_LOST_BOLT");

      private OutputCollector collector;

      private KieSession kieSession;

      private FactHandle factHandle;

      @Override
      public void execute(Tuple input) {
        // 获取数据
        String sentence = (String) input.getValue(0);
        LOGGER.info("DealLostBolt获取到的数据：" + sentence);

        // 数据转换
        PutDataPoint dataPoint = Json.fromJson(PutDataPoint.class, sentence);

        KieServices ks = KieServices.Factory.get();
        KieContainer kieContainer = ks.getKieClasspathContainer();
        kieSession = kieContainer.newKieSession("all-rule");
        kieSession.getAgenda().getAgendaGroup("deal-lost").setFocus();

        factHandle = kieSession.insert(dataPoint);
        kieSession.fireAllRules();
        kieSession.delete(factHandle);

        collector.emit(new Values(sentence));
      }

      @Override
      public void declareOutputFields(OutputFieldsDeclarer declarer) {
        declarer.declare(new Fields("value"));

      }

      @Override
      public void prepare(Map stormConf, TopologyContext context, OutputCollector collector) {
        this.collector = collector;
      }

    }

我用官方文件创造了kiesession。错误是：

java.lang.RuntimeException: java.lang.NullPointerException
    at org.apache.storm.utils.DisruptorQueue.consumeBatchToCursor(DisruptorQueue.java:495) ~[storm-core-1.1.1.jar:1.1.1]
    at org.apache.storm.utils.DisruptorQueue.consumeBatchWhenAvailable(DisruptorQueue.java:460) ~[storm-core-1.1.1.jar:1.1.1]
    at org.apache.storm.disruptor$consume_batch_when_available.invoke(disruptor.clj:73) ~[storm-core-1.1.1.jar:1.1.1]
    at org.apache.storm.daemon.executor$fn__5030$fn__5043$fn__5096.invoke(executor.clj:848) ~[storm-core-1.1.1.jar:1.1.1]
    at org.apache.storm.util$async_loop$fn__557.invoke(util.clj:484) [storm-core-1.1.1.jar:1.1.1]
    at clojure.lang.AFn.run(AFn.java:22) [clojure-1.7.0.jar:?]
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_121]
    Caused by: java.lang.NullPointerException
    at org.kie.internal.io.ResourceFactory.newByteArrayResource(ResourceFactory.java:66) ~[se-storm-0.0.1-SNAPSHOT-jar-with-dependencies.jar:?]
    at org.drools.compiler.kie.builder.impl.AbstractKieModule.getResource(AbstractKieModule.java:299) ~[se-storm-0.0.1-SNAPSHOT-jar-with-dependencies.jar:?]
    at org.drools.compiler.kie.builder.impl.AbstractKieModule.addResourceToCompiler(AbstractKieModule.java:264) ~[se-storm-0.0.1-SNAPSHOT-jar-with-dependencies.jar:?]
    at org.drools.compiler.kie.builder.impl.AbstractKieModule.addResourceToCompiler(AbstractKieModule.java:259) ~[se-storm-0.0.1-SNAPSHOT-jar-with-dependencies.jar:?]
    at org.drools.compiler.kie.builder.impl.AbstractKieProject.buildKnowledgePackages(AbstractKieProject.java:228) ~[se-storm-0.0.1-SNAPSHOT-jar-with-dependencies.jar:?]
    at org.drools.compiler.kie.builder.impl.AbstractKieModule.createKieBase(AbstractKieModule.java:206) ~[se-storm-0.0.1-SNAPSHOT-jar-with-dependencies.jar:?]
    at org.drools.compiler.kie.builder.impl.KieContainerImpl.createKieBase(KieContainerImpl.java:584) ~[se-storm-0.0.1-SNAPSHOT-jar-with-dependencies.jar:?]
    at org.drools.compiler.kie.builder.impl.KieContainerImpl.getKieBase(KieContainerImpl.java:552) ~[se-storm-0.0.1-SNAPSHOT-jar-with-dependencies.jar:?]
    at org.drools.compiler.kie.builder.impl.KieContainerImpl.newKieSession(KieContainerImpl.java:680) ~[se-storm-0.0.1-SNAPSHOT-jar-with-dependencies.jar:?]
    at org.drools.compiler.kie.builder.impl.KieContainerImpl.newKieSession(KieContainerImpl.java:648) ~[se-storm-0.0.1-SNAPSHOT-jar-with-dependencies.jar:?]
    at cn.ennwifi.storm.bolt.DealLostBolt.execute(DealLostBolt.java:52) ~[se-storm-0.0.1-SNAPSHOT-jar-with-dependencies.jar:?]
    at org.apache.storm.daemon.executor$fn__5030$tuple_action_fn__5032.invoke(executor.clj:729) ~[storm-core-1.1.1.jar:1.1.1]
    at org.apache.storm.daemon.executor$mk_task_receiver$fn__4951.invoke(executor.clj:461) ~[storm-core-1.1.1.jar:1.1.1]
    at org.apache.storm.disruptor$clojure_handler$reify__4465.onEvent(disruptor.clj:40) ~[storm-core-1.1.1.jar:1.1.1]
    at org.apache.storm.utils.DisruptorQueue.consumeBatchToCursor(DisruptorQueue.java:482) ~[storm-core-1.1.1.jar:1.1.1]
    ... 6 more

Perhapse有些东西没有初始化。但是当印迹执行时我创建了一个新的kieservice。有人能帮助我吗？

谢谢！

Answer 1

我有一个类似的问题，使用Drools和JMH作为阴影罐。 Drools使用ServiceRegistry方法。这意味着Drools库（drools-compiler，kie-ci，drools-decisiontables，...）包含相同的命名属性文件，该文件指示它们提供的接口的实现。

阴影jar插件通常将（传递）依赖项展平为一个jar。对于多次存在的文件，这通常意味着如果没有另外指定，则选择其中一个文件。对于ServiceRegistry属性，我们需要组合所有文件。通常这是通过ServicesResourceTransformer完成的。这个Transformer处理META-INF/services/中的文件，但Drools的相关文件是META-INF/kie.conf。我可以用AppendingTransformer解决JMH的问题：

<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
    <resource>META-INF/kie.conf</resource>
</transformer>

我不是Storm的专家，但Starter建议它也使用了阴影插件。我假设您从IDE运行本地群集 - 它不使用着色jar。