fix header nullpointerexception

src/main/scala/ch/memobase/App.scala

@@ -63,10 +63,9 @@ object App extends scala.App with Logging with RecordUtils {
       val records = consumer.poll(Duration.ofMillis(consumerPollTimeoutMs)).asScala
       records.foreach {
         record => {
-          logger.info(s"Build record ${record.key()}") // TODO: Remove
           val headers = record.headers()
-          val recordSetHeader = Try(headers.lastHeader("recordSetId")).toOption
-          val institutionHeader = Try(headers.lastHeader("institutionId")).toOption
+          val recordSetId = Try(headers.lastHeader("recordSetId").value()).getOrElse(Array())
+          val institutionId = Try(headers.lastHeader("institutionId").value()).getOrElse(Array())
           val reportingObject = recordProcessor.process(record).foldLeft(ReportingObject(record.key()))((reportingObject, outcome) => outcome match {
             case ProcessSuccess(id, resource, msg) =>
               logger.info(s"$id: $msg")
@@ -82,8 +81,7 @@ object App extends scala.App with Logging with RecordUtils {
               logger.debug(ex.getStackTrace.mkString("\n"))
               ReportingObject.addResourceOutcome(reportingObject, (resource, s"$msg: ${ex.getMessage}"), ProcessingFatal)
           })
-          reporter.send(reportingObject, recordSetHeader, institutionHeader)
-          logger.info(s"Record ${record.key()} sent")  // TODO: Remove
+          reporter.send(reportingObject, recordSetId, institutionId)
         }
       }
     }

src/main/scala/ch/memobase/Reporter.scala

@@ -38,13 +38,28 @@ class Reporter(props: Properties, reportingTopic: String) extends Logging {
 
   private val producer = new KafkaProducer[String, String](props)
 
-  def send(report: models.ReportingObject, recordSetHeader: Option[Header], institutionHeader: Option[Header]): JavaFuture[RecordMetadata] = {
-    val producerRecord = new ProducerRecord[String, String](reportingTopic, 0, report.id, report.toString,
-      List(recordSetHeader, institutionHeader).flatten.asJava)
+  def send(report: models.ReportingObject, recordSetId: Array[Byte], institutionId: Array[Byte]): JavaFuture[RecordMetadata] = {
+    val headers = createHeaders(recordSetId, institutionId)
+    val producerRecord = new ProducerRecord[String, String](reportingTopic, null, report.id, report.toString, headers)
     logger.info(s"Sending report: $report")
     producer.send(producerRecord)
   }
 
+  private def createHeaders(recordSetId: Array[Byte], institutionId: Array[Byte]): java.lang.Iterable[Header] = {
+    List(
+      new Header {
+        override def key(): String = "recordSetId"
+
+        override def value(): Array[Byte] = recordSetId
+      },
+      new Header {
+        override def key(): String = "institutionId"
+
+        override def value(): Array[Byte] = institutionId
+      }
+    ).asJava
+  }
+
   def close(): Unit = producer.close()
 
 }