flink read data from kafka

Question

I write a simple example

val env = StreamExecutionEnvironment.getExecutionEnvironment
val properties = new Properties()
properties.setProperty("bootstrap.servers","xxxxxx")
properties.setProperty("zookeeper.connect","xxxxxx")
properties.setProperty("group.id", "caffrey")
val stream = env
  .addSource(new FlinkKafkaConsumer082[String]("topic", new SimpleStringSchema(), properties))
.print()

env.execute("Flink Kafka Example")

when I run this code I got an error like this:

[error] Class org.apache.flink.streaming.api.checkpoint.CheckpointNotifier not found - continuing with a stub.

I google this error and find CheckpointNotifier is an interface . I really don't understand where did I do wrong.

Answer 1

Since CheckpointNotifier is a class from an older Flink version, I suspect that you are mixing different Flink dependencies in your pom file.

Make sure all Flink dependencies have the same version.