Make generator classes final.

Author: phipag

examples/powertools-examples-kafka/tools/src/main/java/org/demo/kafka/tools/GenerateAvroSamples.java

@@ -14,7 +14,7 @@
  * Utility class to generate base64-encoded Avro serialized products
  * for use in test events.
  */
-public class GenerateAvroSamples {
+public final class GenerateAvroSamples {
 
     private GenerateAvroSamples() {
         // Utility class

examples/powertools-examples-kafka/tools/src/main/java/org/demo/kafka/tools/GenerateJsonSamples.java

@@ -11,7 +11,7 @@
  * Utility class to generate base64-encoded JSON serialized products
  * for use in test events.
  */
-public class GenerateJsonSamples {
+public final class GenerateJsonSamples {
 
     private GenerateJsonSamples() {
         // Utility class

examples/powertools-examples-kafka/tools/src/main/java/org/demo/kafka/tools/GenerateProtobufSamples.java

@@ -12,7 +12,7 @@
  * Utility class to generate base64-encoded Protobuf serialized products
  * for use in test events.
  */
-public class GenerateProtobufSamples {
+public final class GenerateProtobufSamples {
 
     private GenerateProtobufSamples() {
         // Utility class