Fix use of key serializer instead value serializer of avro

uc1-application/src/main/java/theodolite/uc1/streamprocessing/TopologyBuilder.java

@@ -40,7 +40,7 @@ public class TopologyBuilder {
     this.builder
         .stream(this.inputTopic, Consumed.with(
             Serdes.String(),
-            this.srAvroSerdeFactory.<ActivePowerRecord>forKeys()))
+            this.srAvroSerdeFactory.<ActivePowerRecord>forValues()))
         .mapValues(v -> this.gson.toJson(v))
         .foreach((k, v) -> LOGGER.info("Key: " + k + " Value: " + v));
 

uc1-workload-generator/src/main/java/theodolite/kafkasender/KafkaRecordSender.java

@@ -15,7 +15,7 @@ import titan.ccp.common.kafka.avro.SchemaRegistryAvroSerdeFactory;
 /**
  * Sends monitoring records to Kafka.
  *
- * @param <T> {@link IMonitoringRecord} to send
+ * @param <T> {@link SpecificRecord} to send
  */
 public class KafkaRecordSender<T extends SpecificRecord> {
 
@@ -72,7 +72,7 @@ public class KafkaRecordSender<T extends SpecificRecord> {
 
     this.producer = new KafkaProducer<>(properties,
         new StringSerializer(),
-        srAvroSerdeFactory.<T>forKeys().serializer());
+        srAvroSerdeFactory.<T>forValues().serializer());
   }
 
   /**

uc3-application/src/main/java/theodolite/uc3/streamprocessing/TopologyBuilder.java

@@ -50,7 +50,7 @@ public class TopologyBuilder {
     this.builder
         .stream(this.inputTopic,
             Consumed.with(Serdes.String(),
-                this.srAvroSerdeFactory.<ActivePowerRecord>forKeys()))
+                this.srAvroSerdeFactory.<ActivePowerRecord>forValues()))
         .groupByKey()
         .windowedBy(TimeWindows.of(this.duration))
         // .aggregate(