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 c75aa62d96da998615831274e2f762c92f50c77b..ba9d0f96e7c3b85ad1be0519f78068a645ae42f9 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
@@ -1,5 +1,6 @@
 package theodolite.commons.beam;
 
+import java.util.HashMap;
 import java.util.Properties;
 import org.apache.beam.sdk.Pipeline;
 import org.apache.beam.sdk.options.PipelineOptions;
@@ -30,8 +31,8 @@ public class AbstractPipeline extends Pipeline {
    *
    * @return the build configuration.
    */
-  public Properties buildConsumerConfig() {
-    final Properties consumerConfig = new Properties();
+  public HashMap buildConsumerConfig() {
+    final HashMap consumerConfig = new HashMap();
     consumerConfig.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG,
         config.getString(ConfigurationKeys.ENABLE_AUTO_COMMIT_CONFIG));
     consumerConfig.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG,
diff --git a/theodolite-benchmarks/uc1-beam/src/main/java/application/Uc1BeamPipeline.java b/theodolite-benchmarks/uc1-beam/src/main/java/application/Uc1BeamPipeline.java
index dc289826352b11c70c5a2858af6d1bcd9f41ff5e..b67b76b742a897c39bb50a82c00e00ffced8c6f7 100644
--- a/theodolite-benchmarks/uc1-beam/src/main/java/application/Uc1BeamPipeline.java
+++ b/theodolite-benchmarks/uc1-beam/src/main/java/application/Uc1BeamPipeline.java
@@ -1,5 +1,6 @@
 package application;
 
+import java.util.HashMap;
 import java.util.Properties;
 import org.apache.beam.sdk.coders.AvroCoder;
 import org.apache.beam.sdk.coders.CoderRegistry;
@@ -34,7 +35,7 @@ public final class Uc1BeamPipeline extends AbstractPipeline {
     cr.registerCoderForClass(ActivePowerRecord.class, AvroCoder.of(ActivePowerRecord.SCHEMA$));
 
     // build KafkaConsumerConfig
-    final Properties consumerConfig = buildConsumerConfig();
+    final HashMap consumerConfig = buildConsumerConfig();
 
     // Create Pipeline transformations
     final PTransform<PBegin, PCollection<KV<String, ActivePowerRecord>>> kafka =
diff --git a/theodolite-benchmarks/uc2-beam/src/main/java/application/Uc2BeamPipeline.java b/theodolite-benchmarks/uc2-beam/src/main/java/application/Uc2BeamPipeline.java
index fa7d455e3625309843cc055a39721873f8d51d8f..2971390c627b8c8765cee486860427c335acf7f2 100644
--- a/theodolite-benchmarks/uc2-beam/src/main/java/application/Uc2BeamPipeline.java
+++ b/theodolite-benchmarks/uc2-beam/src/main/java/application/Uc2BeamPipeline.java
@@ -2,6 +2,8 @@ package application;
 
 import com.google.common.math.Stats;
 import com.google.common.math.StatsAccumulator;
+
+import java.util.HashMap;
 import java.util.Properties;
 import org.apache.beam.sdk.coders.AvroCoder;
 import org.apache.beam.sdk.coders.CoderRegistry;
@@ -48,7 +50,7 @@ public final class Uc2BeamPipeline extends AbstractPipeline {
     final Duration duration = Duration.standardMinutes(windowDurationMinutes);
 
     // Build kafka configuration
-    final Properties consumerConfig = buildConsumerConfig();
+    final HashMap consumerConfig = buildConsumerConfig();
 
     // Set Coders for Classes that will be distributed
     final CoderRegistry cr = this.getCoderRegistry();
diff --git a/theodolite-benchmarks/uc3-beam/src/main/java/application/Uc3BeamPipeline.java b/theodolite-benchmarks/uc3-beam/src/main/java/application/Uc3BeamPipeline.java
index 504a6f286f26a96bfc403783b5183eb2949b1e79..6964d23d84fcc1d0f836842d8d4c146352b10e90 100644
--- a/theodolite-benchmarks/uc3-beam/src/main/java/application/Uc3BeamPipeline.java
+++ b/theodolite-benchmarks/uc3-beam/src/main/java/application/Uc3BeamPipeline.java
@@ -2,6 +2,8 @@ package application;
 
 import com.google.common.math.Stats;
 import com.google.common.math.StatsAccumulator;
+
+import java.util.HashMap;
 import java.util.Properties;
 import org.apache.beam.sdk.coders.AvroCoder;
 import org.apache.beam.sdk.coders.CoderRegistry;
@@ -56,7 +58,7 @@ public final class Uc3BeamPipeline extends AbstractPipeline {
     final Duration triggerDelay = Duration.standardSeconds(triggerInterval);
 
     // Build kafka configuration
-    final Properties consumerConfig = buildConsumerConfig();
+    final HashMap consumerConfig = buildConsumerConfig();
 
     // Set Coders for Classes that will be distributed
     final CoderRegistry cr = this.getCoderRegistry();