Thanks for Mr. Owen told me before that to using cloudera repo. My Spark ALS app are now successfully running on CDH4.6 . I change my pom.xml to cloudera-repos. <repositories>         <repository>             <id>cloudera.repo</id>             <url>https://repository.cloudera.com/artifactory/cloudera-repos</url>             <name>Cloudera Repositories</name>             <releases>                 <enabled>true</enabled>             </releases>             <snapshots>                 <enabled>false</enabled>             </snapshots>         </repository>     </repositories>   And change my dependencies in pom.xml   <dependencies>         <!--<dependency>-->             <!--<groupId>org.apache.spark</groupId>-->             <!--<artifactId>spark-core_2.10</artifactId>-->             <!--<version>0.9.0-incubating</version>-->         <!--</dependency>-->         <dependency>             <groupId>org.apache.hadoop</groupId>             <artifactId>hadoop-client</artifactId>             <version>2.2.0</version>         </dependency>         <!--<dependency>-->             <!--<groupId>org.apache.spark</groupId>-->             <!--<artifactId>spark-streaming_2.10</artifactId>-->             <!--<version>0.9.0-incubating</version>-->         <!--</dependency>-->         <dependency>             <groupId>org.apache.spark</groupId>             <artifactId>spark-mllib_2.10</artifactId>             <version>0.9.0-incubating</version>         </dependency>         <dependency>             <groupId>org.scala-lang</groupId>             <artifactId>scala-library</artifactId>             <version>2.10.1</version>         </dependency>         <dependency>             <groupId>org.apache.spark</groupId>             <artifactId>spark-core_2.10</artifactId>             <version>0.9.0-cdh4.6.0</version>         </dependency>     </dependencies> ... View more