i am working on coap protocol for an Iot Application .I' ve made this as a Spark-Streaming Source.

i simply 've made a resource and add it to my server as a observable resource. then i start observing it through myclient,

It fetches the data perfectly but also gives the following exception.

15/10/14 13:49:48 ERROR BlockGenerator: Error in block pushing thread

java.io.NotSerializableException: org.eclipse.californium.core.CoapObserveRelation

Serialization stack:

- object not serializable (class: org.eclipse.californium.core.CoapObserveRelation, value: org.eclipse.californium.core.CoapObserveRelation@25d5cb65)

at org.apache.spark.serializer.SerializationDebugger$.improveException(SerializationDebugger.scala:40)

at org.apache.spark.serializer.JavaSerializationStream.writeObject(JavaSerializer.scala:47)

at org.apache.spark.serializer.SerializationStream.writeAll(Serializer.scala:153)

at org.apache.spark.storage.BlockManager.dataSerializeStream(BlockManager.scala:1189)

at org.apache.spark.storage.BlockManager.dataSerialize(BlockManager.scala:1198)

at org.apache.spark.storage.BlockManager.doPut(BlockManager.scala:850)

at org.apache.spark.storage.BlockManager.putIterator(BlockManager.scala:637)

at org.apache.spark.streaming.receiver.BlockManagerBasedBlockHandler.storeBlock(ReceivedBlockHandler.scala:77)

at org.apache.spark.streaming.receiver.ReceiverSupervisorImpl.pushAndReportBlock(ReceiverSupervisorImpl.scala:141)

at org.apache.spark.streaming.receiver.ReceiverSupervisorImpl.pushArrayBuffer(ReceiverSupervisorImpl.scala:112)

at org.apache.spark.streaming.receiver.ReceiverSupervisorImpl$$anon$2.onPushBlock(ReceiverSupervisorImpl.scala:97)

at org.apache.spark.streaming.receiver.BlockGenerator.pushBlock(BlockGenerator.scala:198)

at org.apache.spark.streaming.receiver.BlockGenerator.org$apache$spark$streaming$receiver$BlockGenerator$$keepPushingBlocks(BlockGenerator.scala:171)

at org.apache.spark.streaming.receiver.BlockGenerator$$anon$1.run(BlockGenerator.scala:89)

can anyone have idea about this.?

This is my custom receiver for making my client to stream it.

class customReceiver(test:String) extends Receiver[CoapObserveRelation](StorageLevel.MEMORY_AND_DISK_2) with Logging{

@volatile private var stopped = false

override def onStart() {

val client = new CoapClient("coap://localhost/temp")

var response=client.observe(new CoapHandler() {

override def onLoad(response: CoapResponse) {

}

override def onError() {

System.err.println("Failed")

}

})

response.proactiveCancel();

store(response)

}

Any help is much awaited and appreciated :)

Thanks