diff --git a/theodolite-benchmarks/beam-commons/src/main/java/theodolite/commons/beam/AbstractPipeline.java b/theodolite-benchmarks/beam-commons/src/main/java/theodolite/commons/beam/AbstractPipeline.java
index e67c5f60b6401b4ecd1f42b2a184afbc4654f425..06730588eeb39f662374215acf0688f9c5e9eec2 100644
--- a/theodolite-benchmarks/beam-commons/src/main/java/theodolite/commons/beam/AbstractPipeline.java
+++ b/theodolite-benchmarks/beam-commons/src/main/java/theodolite/commons/beam/AbstractPipeline.java
@@ -12,8 +12,8 @@ import org.apache.kafka.clients.consumer.ConsumerConfig;
  */
 public class AbstractPipeline extends Pipeline {
 
-  private static final String KAFKA_CONFIG_SPECIFIC_AVRO_READER = "specific.avro.reader";
-  private static final String KAFKA_CONFIG_SCHEMA_REGISTRY_URL = "schema.registry.url";
+  private static final String KAFKA_CONFIG_SPECIFIC_AVRO_READER = "specific.avro.reader"; // NOPMD
+  private static final String KAFKA_CONFIG_SCHEMA_REGISTRY_URL = "schema.registry.url"; // NOPMD
   protected final String inputTopic;
   protected final String bootstrapServer;
   // Application Configurations
diff --git a/theodolite-benchmarks/uc4-beam/src/main/java/serialization/AggregatedActivePowerRecordCoder.java b/theodolite-benchmarks/uc4-beam/src/main/java/serialization/AggregatedActivePowerRecordCoder.java
index 28f3d70b4a19756454fe4564b6f85599e7f17777..3e0be0fa456efa3ec67504ea9d0e285ae8b3b913 100644
--- a/theodolite-benchmarks/uc4-beam/src/main/java/serialization/AggregatedActivePowerRecordCoder.java
+++ b/theodolite-benchmarks/uc4-beam/src/main/java/serialization/AggregatedActivePowerRecordCoder.java
@@ -44,7 +44,7 @@ public class AggregatedActivePowerRecordCoder extends Coder<AggregatedActivePowe
 
   @Override
   public List<? extends Coder<?>> getCoderArguments() {
-    return null;
+    return List.of();
   }
 
   @Override