UnsupportedOperationException

[nihavend]

Modifed : I realised that tha Java version was mapped to 0.2 version of exercises but the scala was mapped to 0.3

I changed it to 0.2 and now it is working as expected.

Is there any thing strange ?

While trying a got an exception below.

```

Exception in thread "main" org.apache.flink.runtime.client.JobExecutionException: Job execution failed.
at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$5.apply$mcV$sp(JobManager.scala:563)
at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$5.apply(JobManager.scala:509)
at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$5.apply(JobManager.scala:509)
at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:41)
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:401)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.pollAndExecAll(ForkJoinPool.java:1253)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1346)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
Caused by: java.lang.UnsupportedOperationException: Automatic-Timestamp sources cannot emit elements with a timestamp. See interface ManualTimestampSourceFunction if you want to manually assign timestamps to elements.
at org.apache.flink.streaming.api.operators.StreamSource$AutomaticWatermarkContext.collectWithTimestamp(StreamSource.java:226)
at com.dataartisans.flinktraining.exercises.datastream_java.sources.TaxiRideSource.generateUnorderedStream(TaxiRideSource.java:278)
at com.dataartisans.flinktraining.exercises.datastream_java.sources.TaxiRideSource.run(TaxiRideSource.java:130)
at org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:58)
at org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:55)
at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:218)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:584)
at java.lang.Thread.run(Thread.java:745)