0

我正在尝试在提交到集群的火花作业中使用流口水。这项工作将从drools 服务器获取drools jar 开始，然后初始化基础和会话。我的代码在 Spark 中执行时可以工作，但在提交到 Spark 集群时会发生 NPE。

这就是我正在做的

String url = "{my server address}/drools-wb/maven2/com/myspace/Project1/1.0.0/Project1-1.0.0.jar";
KieServices ks = KieServices.Factory.get();

//ERROR is in the below line 
ReleaseId releaseId = ks.newReleaseId("com.myspace", "Project1", "1.0.0"); 

KieRepository kr = ks.getRepository();
UrlResource urlResource = (UrlResource) ks.getResources().newUrlResource(url);

提交代码后出现的错误：

Exception in thread "main" java.lang.NullPointerException
    at org.opencell.spark.jobs.TestWithDrools.main(TestWithDrools.java:47)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.spark.deploy.JavaMainApplication.start(SparkApplication.scala:52)
    at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:879)
    at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:197)
    at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:227)
    at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:136)
    at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
2018-08-29 10:08:09 INFO  ShutdownHookManager:54 - Shutdown hook called

你有解决这个问题的想法吗？

4

1 回答 1

0

该问题是由于 ks 为空而引起的。

所以要解决这个问题，请参考这篇文章：

Drools 7.4.1 kieservices.factory.get() 返回 null

于 2018-08-29T15:23:58.560 回答