我正试图通过oozie运行hadoop作业。作业将数据上传到aws中的dynamodb。因此，我使用 AmazonDynamoDBClient . 我在异径管中遇到以下例外情况：

2016-06-14 10:30:52,997 FATAL [main] org.apache.hadoop.mapred.YarnChild: Error running child : java.lang.NoSuchMethodError: com.fasterxml.jackson.core.JsonFactory.requiresPropertyOrdering()Z
    at com.fasterxml.jackson.databind.ObjectMapper.<init>(ObjectMapper.java:458)
    at com.fasterxml.jackson.databind.ObjectMapper.<init>(ObjectMapper.java:379)
    at com.amazonaws.util.json.Jackson.<clinit>(Jackson.java:32)
    at com.amazonaws.internal.config.InternalConfig.loadfrom(InternalConfig.java:233)
    at com.amazonaws.internal.config.InternalConfig.load(InternalConfig.java:251)
    at com.amazonaws.internal.config.InternalConfig$Factory.<clinit>(InternalConfig.java:308)
    at com.amazonaws.util.VersionInfoUtils.userAgent(VersionInfoUtils.java:139)
    at com.amazonaws.util.VersionInfoUtils.initializeUserAgent(VersionInfoUtils.java:134)
    at com.amazonaws.util.VersionInfoUtils.getUserAgent(VersionInfoUtils.java:95)
    at com.amazonaws.ClientConfiguration.<clinit>(ClientConfiguration.java:42)
    at com.amazonaws.PredefinedClientConfigurations.dynamoDefault(PredefinedClientConfigurations.java:38)
    at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.<init>(AmazonDynamoDBClient.java:292)
    at com.mypackage.UploadDataToDynamoDBMR$DataUploaderReducer.setup(UploadDataToDynamoDBMR.java:396)
    at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:168)
    at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:627)
    at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:389)
    at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:163)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:415)
    at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1628)
    at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)

我使用了一个fat jar来打包所有依赖项，并将jar复制到oozie的 lib 目录。
我还使用pom中的依赖关系管理将fasterxml-jackson依赖关系绑定到2.4.1（由aws dynamodb sdk使用）。但是，当执行发生在reducer上时，fasterxml jackson的其他版本会首先出现在类路径上（我相信是这样）。
我还从dynamodb和aws sdk中排除了jackson依赖性。

<dependency>
  <groupId>com.amazonaws</groupId>
  <artifactId>aws-java-sdk-dynamodb</artifactId>
  <version>1.10.11</version>
  <exclusions>
    <exclusion>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>*</artifactId>
    </exclusion>
  </exclusions>
</dependency>

<dependency>
  <groupId>com.amazonaws</groupId>
  <artifactId>aws-java-sdk-core</artifactId>
  <version>1.10.11</version>
  <exclusions>
    <exclusion>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>*</artifactId>
    </exclusion>
  </exclusions>
</dependency>

如何确保我的jar是mappers和reducer中类路径上的第一个jar？我尝试了此页上的建议，并将以下属性添加到作业的配置xml中：

<property>
    <name>oozie.launcher.mapreduce.user.classpath.first</name>
    <value>true</value>
</property>

但这没有帮助。
有什么建议吗？