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使用SparkStreaming 读取kafka数据进行处理，程序启动报异常：
java.lang.ClassCastException: kafka.cluster.BrokerEndPoint cannot be cast to kafka.cluster.Broker
原因是kafka client版本和 spark-streaming-kafka 版本不匹配造成的。
pom文件改成如下：
<groupId>spark-project</groupId><artifactId>ruleEngine</artifactId><packaging>pom</packaging><version>1.0-SNAPSHOT</version><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><maven.compiler.source>1.8</maven.compiler.source><maven.compiler.target>1.8</maven.compiler.target></properties><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.11</version><scope>test</scope></dependency><dependency><groupId>org.apache.spark</groupId><artifactId>spark-core_2.11</artifactId><version>2.2.0</version><exclusions><exclusion><artifactId>zookeeper</artifactId><groupId>org.apache.zookeeper</groupId></exclusion></exclusions></dependency><dependency><groupId>org.apache.spark</groupId><artifactId>spark-streaming_2.11</artifactId><version>2.2.0</version></dependency><dependency><groupId>org.apache.spark</groupId><artifactId>spark-sql_2.11</artifactId><version>2.2.0</version><exclusions><exclusion><artifactId>spark-core_2.11</artifactId><groupId>org.apache.spark</groupId></exclusion><exclusion><artifactId>spark-tags_2.11</artifactId><groupId>org.apache.spark</groupId></exclusion><exclusion><artifactId>spark-unsafe_2.11</artifactId><groupId>org.apache.spark</groupId></exclusion></exclusions></dependency><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.1.41</version></dependency><dependency><groupId>org.apache.spark</groupId><artifactId>spark-streaming-kafka-0-8_2.11</artifactId><version>2.2.0</version><exclusions><exclusion><artifactId>kafka_2.11</artifactId><groupId>org.apache.kafka</groupId></exclusion><exclusion><artifactId>spark-tags_2.11</artifactId><groupId>org.apache.spark</groupId></exclusion></exclusions></dependency><dependency><groupId>org.apache.kafka</groupId><artifactId>kafka_2.11</artifactId><version>0.8.2.1</version><exclusions><exclusion><artifactId>log4j</artifactId><groupId>log4j</groupId></exclusion></exclusions></dependency><dependency><groupId>org.apache.httpcomponents</groupId><artifactId>httpclient</artifactId><version>4.5.6</version></dependency><dependency><groupId>org.apache.kafka</groupId><artifactId>kafka-clients</artifactId><version>0.10.0.0</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.6</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.10</version></dependency></dependencies>其中这两处的依赖版本要匹配：
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-streaming-kafka-0-8_2.11</artifactId>
<version>2.2.0</version>
</dependency>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka_2.11</artifactId>
<version>0.8.2.1</version>
</dependency>
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