Fix TbKafkaNode. Configure directly serializer class for key/values instead of string class name.

common/queue/src/main/java/org/thingsboard/server/queue/kafka/TbKafkaSettings.java

@@ -22,6 +22,10 @@ import org.apache.kafka.clients.CommonClientConfigs;
 import org.apache.kafka.clients.admin.AdminClientConfig;
 import org.apache.kafka.clients.consumer.ConsumerConfig;
 import org.apache.kafka.clients.producer.ProducerConfig;
+import org.apache.kafka.common.serialization.ByteArrayDeserializer;
+import org.apache.kafka.common.serialization.ByteArraySerializer;
+import org.apache.kafka.common.serialization.StringDeserializer;
+import org.apache.kafka.common.serialization.StringSerializer;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.context.properties.ConfigurationProperties;
@@ -107,8 +111,8 @@ public class TbKafkaSettings {
         props.put(ConsumerConfig.FETCH_MAX_BYTES_CONFIG, fetchMaxBytes);
         props.put(ConsumerConfig.MAX_POLL_INTERVAL_MS_CONFIG, maxPollIntervalMs);
 
-        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
+        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
-        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.ByteArrayDeserializer");
+        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, ByteArrayDeserializer.class);
         return props;
     }
 
@@ -120,8 +124,8 @@ public class TbKafkaSettings {
         props.put(ProducerConfig.BATCH_SIZE_CONFIG, batchSize);
         props.put(ProducerConfig.LINGER_MS_CONFIG, lingerMs);
         props.put(ProducerConfig.BUFFER_MEMORY_CONFIG, bufferMemory);
-        props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer");
+        props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
-        props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.ByteArraySerializer");
+        props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, ByteArraySerializer.class);
         return props;
     }
 

dao/src/test/resources/nosql-test.properties

@@ -6,6 +6,8 @@ sql.ts_inserts_fixed_thread_pool_size=10
 
 spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation=true
 spring.jpa.properties.hibernate.order_by.default_null_ordering=last
+spring.jpa.properties.hibernate.jdbc.log.warnings=false
+
 spring.jpa.show-sql=false
 spring.jpa.hibernate.ddl-auto=none
 spring.jpa.database-platform=org.hibernate.dialect.HSQLDialect

dao/src/test/resources/sql-test.properties

@@ -7,6 +7,8 @@ sql.ts_key_value_partitioning=MONTHS
 #
 spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation=true
 spring.jpa.properties.hibernate.order_by.default_null_ordering=last
+spring.jpa.properties.hibernate.jdbc.log.warnings=false
+
 spring.jpa.show-sql=false
 spring.jpa.hibernate.ddl-auto=validate
 spring.jpa.database-platform=org.hibernate.dialect.HSQLDialect

rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/kafka/TbKafkaNode.java

@@ -17,11 +17,13 @@ package org.thingsboard.rule.engine.kafka;
 
 import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.lang3.BooleanUtils;
+import org.apache.commons.lang3.StringUtils;
 import org.apache.kafka.clients.producer.KafkaProducer;
 import org.apache.kafka.clients.producer.Producer;
 import org.apache.kafka.clients.producer.ProducerConfig;
 import org.apache.kafka.clients.producer.ProducerRecord;
 import org.apache.kafka.clients.producer.RecordMetadata;
+import org.apache.kafka.common.serialization.StringSerializer;
 import org.apache.kafka.common.header.Headers;
 import org.apache.kafka.common.header.internals.RecordHeader;
 import org.apache.kafka.common.header.internals.RecordHeaders;
@@ -73,8 +75,8 @@ public class TbKafkaNode implements TbNode {
         Properties properties = new Properties();
         properties.put(ProducerConfig.CLIENT_ID_CONFIG, "producer-tb-kafka-node-" + ctx.getSelfId().getId().toString() + "-" + ctx.getServiceId());
         properties.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, config.getBootstrapServers());
-        properties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, config.getValueSerializer());
+        properties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, getKafkaSerializerClass(config.getValueSerializer()));
-        properties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, config.getKeySerializer());
+        properties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, getKafkaSerializerClass(config.getKeySerializer()));
         properties.put(ProducerConfig.ACKS_CONFIG, config.getAcks());
         properties.put(ProducerConfig.RETRIES_CONFIG, config.getRetries());
         properties.put(ProducerConfig.BATCH_SIZE_CONFIG, config.getBatchSize());
@@ -92,6 +94,19 @@ public class TbKafkaNode implements TbNode {
         }
     }
 
+    private Class<?> getKafkaSerializerClass(String serializerClassName) {
+        Class<?> serializerClass = null;
+        if (!StringUtils.isEmpty(serializerClassName)) {
+            try {
+                serializerClass = Class.forName(serializerClassName);
+            } catch (ClassNotFoundException e) {}
+        }
+        if (serializerClass == null) {
+            serializerClass = StringSerializer.class;
+        }
+        return serializerClass;
+    }
+
     @Override
     public void onMsg(TbContext ctx, TbMsg msg) {
         String topic = TbNodeUtils.processPattern(config.getTopicPattern(), msg);