flink-cep

I am writing Flink CEP program inside the Lagom's Microservice Implementation. My FLINK CEP program run perfectly fine in simple scala application. But when i use this code inside the Lagom service implementation i am receiving the following exception Lagom Service Implementation override def start = ServiceCall[NotUsed, String] { val env = StreamExecutionEnvironment.getExecutionEnvironment var executionConfig = env.getConfig env.setParallelism(1) executionConfig.disableSysoutLogging() var topic_name="topic_test" var props= new Properties props.put("bootstrap.servers", "localhost:9092") props

I have two raw streams and I am joining those streams and then I want to count what is the total number of events that have been joined and how much events have not. I am doing this by using map on joinedEventDataStream as shown below joinedEventDataStream.map(new RichMapFunction<JoinedEvent, Object>() { @Override public Object map(JoinedEvent joinedEvent) throws Exception { number_of_joined_events += 1; return null; } }); Question # 1: Is this the appropriate way to count the number of events in the stream? Question # 2: I have noticed a wired behavior, which some of you might not believe.