Java AWS EMR上Spark Cluster模式下ObjectMapper中的NullPointerException

我在这一行中遇到了

nullpointer

异常（在aws emr上以群集模式（纱线）运行spark），但在客户端模式下运行良好（以master作为本地）

我正在使用以下依赖项：

<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
  <version>2.9.5</version>
  <scope>compile</scope>
</dependency>

com.fasterxml.jackson.core
杰克逊数据绑定
2.9.5
编译

@Ernest Kiwele发现了问题。那是因为我在进口

---

com.fasterxml.jackson.databind.ObjectMapper

而不是

com.cloudera.com.fasterxml.jackson.databind.ObjectMapper

您需要发布驱动程序的代码，以及通过调用对象映射器进行的转换

18/04/17 12:33:16 ERROR executor.Executor: Exception in task 0.2 in stage 0.0 (TID 4)
java.lang.NullPointerException
    at com.fasterxml.jackson.databind.util.LRUMap.get(LRUMap.java:47)
    at com.fasterxml.jackson.databind.type.TypeFactory._fromClass(TypeFactory.java:707)
    at com.fasterxml.jackson.databind.type.TypeFactory._constructType(TypeFactory.java:387)
    at com.fasterxml.jackson.databind.type.TypeFactory.constructType(TypeFactory.java:354)
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2161)

<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
  <version>2.9.5</version>
  <scope>compile</scope>
</dependency>