I am trying to run the first example from the oreilly book "Stream Processing with Apache Flink" and from the flink project. Each gives different errors
Example from the book gies NoClassDefFound error Example from flink project gives java.net.ConnectException: Connection refused (Connection refused) but does create a flink job, see screenshot.
Detail below
Book example
java.lang.BootstrapMethodError: java.lang.NoClassDefFoundError:scala/runtime/java8/JFunction1$mcVI$sp at io.github.streamingwithflink.chapter1.AverageSensorReadings$$anon$3.createSerializer(AverageSensorReadings.scala:50)
The instructions from the book are:
download flink-1.7.1-bin-scala_2.12.tgz
extract
- start cluster ./bin/start-cluster.sh
- open flink's web UI http://localhost:8081
this all works fine
- Download the jar file that includes examples in this book
- run example
./bin/flink run \
-c io.github.streamingwithflink.chapter1.AverageSensorReadings \
examples-scala.jar
It seems that the class is not found from error message at the top of this post.
I put the jar in the same directory I am running the command
java -version
openjdk version "1.8.0_242"
OpenJDK Runtime Environment (Zulu 8.44.0.9-CA-macosx) (build 1.8.0_242-b20)
OpenJDK 64-Bit Server VM (Zulu 8.44.0.9-CA-macosx) (build 25.242-b20, mixed mode)
I also tried compiling the jar myself with the same error.
https://github.com/streaming-with-flink/examples-scala.git
and
mvn clean build
error is the same.
Flink project tutorial
running the SocketWindowWordCount
./bin/flink run examples/streaming/SocketWindowWordCount.jar --port 9000
I get a job but it fails
gives java.net.ConnectException: Connection refused (Connection refused)
It is not clear to me what connection is refused. I tried different ports with no change.
How can I run flink code successfully?