我正在创建一个使用Spark从服务器获取数据的Java RESTAPI Spring Boot应用程序。但是,当我尝试将Dataset转换为List时,它失败了。
我尝试使用jdk8和jdk11编译和执行代码,但出现了相同的“java.lang.IllegalArgumentException:Unsupported class file major version 55”错误。过去,我通过更新Java版本解决了此问题,但对于这个问题不起作用。
我使用:
JDK 11.0.2
Spring Boot 2.1.4
Spark 2.4.2
这是我正在执行的代码:
Dataset<Row> dataFrame = sparkSession.read().json("/home/data/*.json");
dataFrame.createOrReplaceTempView("events");
Dataset<Row> resultDataFrame = sparkSession.sql("SELECT * FROM events WHERE " + predicate);
Dataset<Event> eventDataSet = resultDataFrame.as(Encoders.bean(Event.class));
return eventDataSet.collectAsList();
查询起作用,实际上在调试过程中您可以看到resultDataFrame和eventDataSet中都有信息。
我期望输出是一个适当的事件列表,但我得到了异常:
[http-nio-8080-exec-2] ERROR org.apache.catalina.core.ContainerBase.[Tomcat].[localhost].[/].[dispatcherServlet] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.IllegalArgumentException: Unsupported class file major version 55] with root cause
java.lang.IllegalArgumentException: Unsupported class file major version 55
at org.apache.xbean.asm6.ClassReader.<init>(ClassReader.java:166)
at org.apache.xbean.asm6.ClassReader.<init>(ClassReader.java:148)
at org.apache.xbean.asm6.ClassReader.<init>(ClassReader.java:136)
at org.apache.xbean.asm6.ClassReader.<init>(ClassReader.java:237)
at org.apache.spark.util.ClosureCleaner$.getClassReader(ClosureCleaner.scala:49)
at org.apache.spark.util.FieldAccessFinder$$anon$3$$anonfun$visitMethodInsn$2.apply(ClosureCleaner.scala:517)
at org.apache.spark.util.FieldAccessFinder$$anon$3$$anonfun$visitMethodInsn$2.apply(ClosureCleaner.scala:500)
at scala.collection.TraversableLike$WithFilter$$anonfun$foreach$1.apply(TraversableLike.scala:733)
at scala.collection.mutable.HashMap$$anon$1$$anonfun$foreach$2.apply(HashMap.scala:134)
at scala.collection.mutable.HashMap$$anon$1$$anonfun$foreach$2.apply(HashMap.scala:134)
at scala.collection.mutable.HashTable$class.foreachEntry(HashTable.scala:236)
at scala.collection.mutable.HashMap.foreachEntry(HashMap.scala:40)
at scala.collection.mutable.HashMap$$anon$1.foreach(HashMap.scala:134)
at scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:732)
at org.apache.spark.util.FieldAccessFinder$$anon$3.visitMethodInsn(ClosureCleaner.scala:500)
.....
评论更新:
对于Java 8,我将pom更改为目标Java 8:
<java.version>1.8</java.version>
然后更新项目,执行 maven clean、maven install,最后运行。 仍然出现相同的版本 55 错误。