Exception in thread "main" java.lang.RuntimeException: java.lang.NoSuchFieldException:
```java
DEFAULT_TINY_CACHE_SIZE
at org.apache.spark.network.util.NettyUtils.getPrivateStaticField(NettyUtils.java:131)
at org.apache.spark.network.util.NettyUtils.createPooledByteBufAllocator(NettyUtils.java:118)
at org.apache.spark.network.server.TransportServer.init(TransportServer.java:94)
at org.apache.spark.network.server.TransportServer.<init>(TransportServer.java:73)
at org.apache.spark.network.TransportContext.createServer(TransportContext.java:114)
at org.apache.spark.rpc.netty.NettyRpcEnv.startServer(NettyRpcEnv.scala:119)
at org.apache.spark.rpc.netty.NettyRpcEnvFactory$$anonfun$4.apply(NettyRpcEnv.scala:465)
at org.apache.spark.rpc.netty.NettyRpcEnvFactory$$anonfun$4.apply(NettyRpcEnv.scala:464)
at org.apache.spark.util.Utils$$anonfun$startServiceOnPort$1.apply$mcVI$sp(Utils.scala:2275)
at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:160)
at org.apache.spark.util.Utils$.startServiceOnPort(Utils.scala:2267)
at org.apache.spark.rpc.netty.NettyRpcEnvFactory.create(NettyRpcEnv.scala:469)
at org.apache.spark.rpc.RpcEnv$.create(RpcEnv.scala:57)
at org.apache.spark.SparkEnv$.create(SparkEnv.scala:249)
at org.apache.spark.SparkEnv$.createDriverEnv(SparkEnv.scala:175)
at org.apache.spark.SparkContext.createSparkEnv(SparkContext.scala:256)
at org.apache.spark.SparkContext.<init>(SparkContext.scala:423)
at org.apache.spark.SparkContext$.getOrCreate(SparkContext.scala:2493)
at org.apache.spark.sql.SparkSession$Builder$$anonfun$7.apply(SparkSession.scala:934)
at org.apache.spark.sql.SparkSession$Builder$$anonfun$7.apply(SparkSession.scala:925)
at scala.Option.getOrElse(Option.scala:121)
at org.apache.spark.sql.SparkSession$Builder.getOrCreate(SparkSession.scala:925)
at ContentRecommender$.main(ContentRecommender.scala:40)
at ContentRecommender.main(ContentRecommender.scala)
Caused by: java.lang.NoSuchFieldException: DEFAULT_TINY_CACHE_SIZE
at java.lang.Class.getDeclaredField(Class.java:2070)
at org.apache.spark.network.util.NettyUtils.getPrivateStaticField(NettyUtils.java:127)
pom.xml
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.11</artifactId>
<version>2.3.4</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-sql_2.11</artifactId>
<version>2.3.4</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-mllib_2.11</artifactId>
<version>2.3.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.mongodb.spark/mongo-spark-connector -->
<dependency>
<groupId>org.mongodb.spark</groupId>
<artifactId>mongo-spark-connector_2.11</artifactId>
<version>2.3.4</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-streaming_2.11</artifactId>
<version>2.3.4</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-graphx_2.11</artifactId>
<version>2.3.4</version>
</dependency>
<dependency>
<groupId>org.jblas</groupId>
<artifactId>jblas</artifactId>
<version>1.2.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/io.netty/netty-all -->
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-all</artifactId>
<version>4.1.17.Final</version>
</dependency>
加了netty-all依赖无效
spark版本：
Welcome to
____ __
/ __/__ ___ _____/ /__
_\ \/ _ \/ _ `/ __/ '_/
/___/ .__/\_,_/_/ /_/\_\ version 2.3.4
/_/
Using Scala version 2.11.8 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_91)
Type in expressions to have them evaluated.
Type :help for more information.
你好，我是有问必答小助手，非常抱歉，本次您提出的有问必答问题，技术专家团超时未为您做出解答
本次提问扣除的有问必答次数，将会以问答VIP体验卡（1次有问必答机会、商城购买实体图书享受95折优惠）的形式为您补发到账户。
因为有问必答VIP体验卡有效期仅有1天，您在需要使用的时候【私信】联系我，我会为您补发。