ERROR: "Failed to construct kafka consumer. Cause: org.apache.kafka.common.KafkaException: org.apache.kafka.common.KafkaException: Failed to load SSL keystore <E:\FlatFileArea\Kafka\DI\xcerts> of type JKS." while testing the kafka connection in CDI ERROR: "Failed to construct kafka consumer. Aug 18, 2017 · Failed to construct kafka consumer. There are quite a few answers on this topic but nothing was working. I am trying to execute the following streams processor. object simplestream extends App { val builder: KStreamBuilder = new KStreamBuilder val streamingConfig = { //ToDo - Move these to config val settings = new Properties settings.put ... Sep 23, 2019 · I'm trying to set up a Spark job to consume data from Kafka. The Kafka brokers have SSL set up, but I'm not able to properly build/authenticate the consumer. spark-shell command: spark-2.3.4-bin- Dec 16, 2021 · For Python applications, you need to add this above library and its dependencies when deploying your application. See the Deploying subsection below. And then when you go to Deploying section it says: As with any Spark applications, spark-submit is used to launch your application. spark-sql-kafka-0-10_2.12 and its dependencies can be directly ... Oct 30, 2021 · ERROR org.apache.kafka.common.utils.KafkaThread - Uncaught exception in thread 'kafka-producer-network-thread 2 Failed to construct kafka consumer with Spring Boot Add a comment. 12. Here is my way to solve this problem: run bin/kafka-server-stop.sh to stop running kafka server. modify the properties file config/server.properties by adding a line: listeners=PLAINTEXT:// {ip.of.your.kafka.server}:9092. restart kafka server. Since without the lisener setting, kafka will use java.net.InetAddress ... Apr 12, 2018 · In my case, I am having Kafka binary kafka_2.11-1.0.0 install both on server and client side, but after creating the topic my consumer is not working when I was using --bootstrap-server instead of --zookeeper. And I changed as per warning coming. ERROR: "Failed to construct kafka consumer. Cause: org.apache.kafka.common.KafkaException: org.apache.kafka.common.KafkaException: Failed to load SSL keystore <E:\FlatFileArea\Kafka\DI\xcerts> of type JKS." while testing the kafka connection in CDI ERROR: "Failed to construct kafka consumer. Dec 25, 2017 · Caused by: java.lang.ClassNotFoundException: org.apache.kafka.common.ClusterResourceListener. You are missing the kafka-clients jar from your class path. What are you using for dependency management? Maven and gradle should put this jar on the class path for you automatically. Dec 13, 2020 · spring集成kafka运行时报错：Failed to construct kafka producer] with root cause org.apache.kafka.common.KafkaException: class org.apache.kafka.common.serialization.StringDeserializer is not an instance of org.apache.kafka.common.serialization.Serializer 如图： Jan 22, 2021 · To display the conditions report re-run your application with 'debug' enabled. 2021-01-22 19:36:06.216 ERROR 61013 --- [ main] o.s.boot.SpringApplication : Application run failed org.springframework.context.ApplicationContextException: Failed to start bean 'org.springframework.kafka.config.internalKafkaListenerEndpointRegistry'; nested ... Jun 30, 2020 · The correct form is kafka: [topicname]? [options] (check Camel-Kafka docs) One of the kafka: [topicname] is kafka: [brokers], remove it. Zookeeper options for old versions of camel-kafka, remove them. By the way: The line SLF4J: Defaulting to no-operation (NOP) logger implementation on top of your stacktrace says that you use SLF4J logging ... Add a comment. 12. Here is my way to solve this problem: run bin/kafka-server-stop.sh to stop running kafka server. modify the properties file config/server.properties by adding a line: listeners=PLAINTEXT:// {ip.of.your.kafka.server}:9092. restart kafka server. Since without the lisener setting, kafka will use java.net.InetAddress ... Oct 9, 2019 · Part of AWS Collective. 1. I have a Spark job that consumes data from a secured Kafka topic. This works when the truststore.jks is physically present where the job is running. However, if I point to my S3 bucket for Spark to grab the JKS file, this fails. This is what my job looks like: Jul 26, 2017 · Ah OK, I apologize, I didn't realize the logs were separately controlled. When I enabled that, both consumer and producer come back with errors constantly. Feb 17, 2017 · org.apache.kafka.common.KafkaException: Failed to construct kafka producer at org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:335) 原因是配置文件：kafka_client_jaas.conf中配置有问题，keyTab的路径不对，导致的； 第二种：生产消费报错： Failed to construct kafka producer Feb 28, 2019 · From what it looks like Kafka fails to read the kafka client configuration specified in the provided jaas_path. From logstash log: Unable to create Kafka consumer from given configuration {:kafka_error_message=>org.apache.kafka.common.KafkaException: Failed to construct kafka consumer, :cause=>java.lang.IllegalArgumentException: Could not find ... Nov 1, 2021 · Getting Failed to construct kafka producer when running the app in azure kubernates. I have a Springboot application which sends a message to a Topic (Lenses Kafka) The application is running fine when i run in my local environment but when i deploy my app in aks spoke 2 cluster it is giving me failed to construct kafka producer . Nov 1, 2021 · Getting Failed to construct kafka producer when running the app in azure kubernates. I have a Springboot application which sends a message to a Topic (Lenses Kafka) The application is running fine when i run in my local environment but when i deploy my app in aks spoke 2 cluster it is giving me failed to construct kafka producer . Dec 26, 2017 · My cluster configuration, class details and jar versions are mentioned in the question org.apache.kafka.common.KafkaException: Failed to construct kafka consumer. I have started Zookeeper-server, Kafka-server and Kafka REST server. Next I am deploying my spring-boot war file named spring-kafka-webhook-service.war file on tomcat. Apr 1, 2020 · spring集成kafka运行时报错：Failed to construct kafka producer] with root cause org.apache.kafka.common.KafkaException: class org.apache.kafka.common.serialization.StringDeserializer is not an instance of org.apache.kafka.common.serialization.Serializer 如图： Jun 11, 2019 · I am trying to develop a Consumer class in Spring Boot for the Kafka (kerberos). I made necessary changes according to kerberos settings as suggested by Gary (Invalid Keystore Format, BootStrap Bro... Issue: During Execution, sometimes Kafka throws Error Exception message which might look similar . Lets see how can we fix that. Caused by: org.apache.kafka.common.KafkaException: **Failed to construct kafka consumer** Fix 1: Below are some of the fixes , you should check-back - Apr 12, 2018 · In my case, I am having Kafka binary kafka_2.11-1.0.0 install both on server and client side, but after creating the topic my consumer is not working when I was using --bootstrap-server instead of --zookeeper. And I changed as per warning coming. Nov 3, 2021 · at org.apache.kafka.common.security.JaasUtils.jaasConfig(JaasUtils.java:50) at org.apache.kafka.common.security.kerberos.KerberosLogin.getServiceName(KerberosLogin.java:297) ... 27 more 报这个错的原因是：虽然使用System.setProperty设了环境变量，但是程序跑到spark集群上时，是分了driver和executor的。 Jul 6, 2021 · 对应改jar依赖的是原生的kafka内容，不是shaded内容. 但是在flink环境下面，已经提供了. flink -sql -connector -kafka_2.11-1.12.0.jar. 可以看到提供的内容，对应进行maven pom文件去掉flink-connector-kafka就可以了，引用flink-sql-connector就可以解决这个问题。. 原创声明：本文系作者 ... May 13, 2020 · Try to construct a kafka consumer with following code import org.apache.kafka.clients.consumer.ConsumerConfig; import org.apache.kafka.clients.consumer.ConsumerRecord ... Oct 12, 2022 · Running into issues when trying to use kerberos auth with connecting to Kafka. Using scala and my jaas.config looks something like this. KafkaClient { com.sun.security.auth.module. Apr 1, 2020 · spring集成kafka运行时报错：Failed to construct kafka producer] with root cause org.apache.kafka.common.KafkaException: class org.apache.kafka.common.serialization.StringDeserializer is not an instance of org.apache.kafka.common.serialization.Serializer 如图： May 18, 2022 · Last published at: May 18th, 2022 Problem You are trying to read or write data to a Kafka stream when you get an error message. kafkashaded.org.apache.kafka.common.KafkaException: Failed to construct kafka consumer Caused by: kafkashaded.org.apache.kafka.common.config.ConfigException: No resolvable bootstrap urls given in bootstrap.servers Dec 13, 2020 · spring集成kafka运行时报错：Failed to construct kafka producer] with root cause org.apache.kafka.common.KafkaException: class org.apache.kafka.common.serialization.StringDeserializer is not an instance of org.apache.kafka.common.serialization.Serializer 如图： May 18, 2022 · Contact your Kafka admin to determine the correct hostname or IP address for the Kafka bootstrap servers in your environment. Make sure you use the correct hostname or IP address when you establish the connection between Kafka and your Apache Spark structured streaming application. Oct 9, 2019 · Part of AWS Collective. 1. I have a Spark job that consumes data from a secured Kafka topic. This works when the truststore.jks is physically present where the job is running. However, if I point to my S3 bucket for Spark to grab the JKS file, this fails. This is what my job looks like: May 18, 2022 · Last published at: May 18th, 2022 Problem You are trying to read or write data to a Kafka stream when you get an error message. kafkashaded.org.apache.kafka.common.KafkaException: Failed to construct kafka consumer Caused by: kafkashaded.org.apache.kafka.common.config.ConfigException: No resolvable bootstrap urls given in bootstrap.servers Jun 30, 2020 · The correct form is kafka: [topicname]? [options] (check Camel-Kafka docs) One of the kafka: [topicname] is kafka: [brokers], remove it. Zookeeper options for old versions of camel-kafka, remove them. By the way: The line SLF4J: Defaulting to no-operation (NOP) logger implementation on top of your stacktrace says that you use SLF4J logging ... Oct 18, 2019 · Flume 中依赖的第三方 jar (Kafka的jar) 发生改变了, 需要重新编译。. 项目中所依赖的 API 如果发生更改，即使在源代码中不需要进行任何更改，也应重新编译。. 如果 API 未发生更改，则无需重新编译。. 所以要解决上述异常，需要将 flume-kafka-source 中依赖的 Kafka 版本 ... Feb 28, 2019 · From what it looks like Kafka fails to read the kafka client configuration specified in the provided jaas_path. From logstash log: Unable to create Kafka consumer from given configuration {:kafka_error_message=>org.apache.kafka.common.KafkaException: Failed to construct kafka consumer, :cause=>java.lang.IllegalArgumentException: Could not find ... May 13, 2020 · Try to construct a kafka consumer with following code import org.apache.kafka.clients.consumer.ConsumerConfig; import org.apache.kafka.clients.consumer.ConsumerRecord ... Jan 25, 2022 · I am getting intermittent issues while accessing the kafka service from the Kubernetes pod. org.apache.kafka.common.KafkaException: Failed to construct kafka producer at org.apache.kafka.clients. Jan 25, 2022 · I am getting intermittent issues while accessing the kafka service from the Kubernetes pod. org.apache.kafka.common.KafkaException: Failed to construct kafka producer at org.apache.kafka.clients. Oct 18, 2019 · Flume 中依赖的第三方 jar (Kafka的jar) 发生改变了, 需要重新编译。. 项目中所依赖的 API 如果发生更改，即使在源代码中不需要进行任何更改，也应重新编译。. 如果 API 未发生更改，则无需重新编译。. 所以要解决上述异常，需要将 flume-kafka-source 中依赖的 Kafka 版本 ... Apr 20, 2021 · 2 Answers. RecordInterceptor is a spring-kafka interface, not plain Kafka API. Consumers will only accept implementations of ConsumerInterceptor, thus likely why the casting failed. Your code is correct, otherwise. Producers only accept ProducerInterceptor, and you'd use producerPrefix in the Streams config/map. Dec 1, 2018 · b:org.springframework.kafka.support.serializer.JsonDeserializer with modifiers "protected" c:If the serializationyou can also enable trust all (*) A2:看下是因为要为监听者得到的对象 在进行序列化与反序列化 要进行设置在上述配置类中如下两列针对该问题 Dec 13, 2020 · spring集成kafka运行时报错：Failed to construct kafka producer] with root cause org.apache.kafka.common.KafkaException: class org.apache.kafka.common.serialization.StringDeserializer is not an instance of org.apache.kafka.common.serialization.Serializer 如图： Sep 10, 2021 · 1. I tried a simple sample code to test access to a "kerberized" Kafka from Quarkus 2.2.2 with smallrye-reactive-messaging-kafka : package org.acme; import org.apache.kafka.clients.consumer.ConsumerRecord; import org.eclipse.microprofile.reactive.messaging.Incoming; import javax.enterprise.context.ApplicationScoped; @ApplicationScoped public ... Add a comment. 12. Here is my way to solve this problem: run bin/kafka-server-stop.sh to stop running kafka server. modify the properties file config/server.properties by adding a line: listeners=PLAINTEXT:// {ip.of.your.kafka.server}:9092. restart kafka server. Since without the lisener setting, kafka will use java.net.InetAddress ... Aug 23, 2022 · Boot 2.3 uses spring-kafka 2.5 by default (and kafka-clients 2.5.0); since you have overridden its prescribed spring-kafka version to 2.6.5, you must override all of the kafka dependencies to match. kafka-clients 2.6.1, kafka-streams 2.6.1 (if you are using them). If you are using the embedded Kafka broker in tests, there are a bunch of other ... Dec 26, 2017 · My cluster configuration, class details and jar versions are mentioned in the question org.apache.kafka.common.KafkaException: Failed to construct kafka consumer. I have started Zookeeper-server, Kafka-server and Kafka REST server. Next I am deploying my spring-boot war file named spring-kafka-webhook-service.war file on tomcat. Oct 30, 2021 · ERROR org.apache.kafka.common.utils.KafkaThread - Uncaught exception in thread 'kafka-producer-network-thread 2 Failed to construct kafka consumer with Spring Boot Jul 18, 2019 · I am trying to register a MySql Debezium connector in SSL enabled Kafka cluster. The curl I am using for this purpose is : curl -k -X POST -H "Accept:application/json" -H "Content-Type:application/ Dec 25, 2017 · Caused by: java.lang.ClassNotFoundException: org.apache.kafka.common.ClusterResourceListener. You are missing the kafka-clients jar from your class path. What are you using for dependency management? Maven and gradle should put this jar on the class path for you automatically. Aug 14, 2020 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question.Provide details and share your research! But avoid …. Asking for help, clarification, or responding to other answers. org.apache.kafka.common.KafkaException: Failed to construct kafka producer ... Exception in thread "Thread-11" org.apache.kafka.common.KafkaException: Failed to ... Dec 7, 2018 · Note: Databricks shades the Kafka client under the kafkashaded package. If you are using Databricks to run Spark, make sure to update all occurrences of org.apache.kafka.common.security.plain.PlainLoginModule to kafkashaded.org.apache.kafka.common.security.plain.PlainLoginModule in these samples! Sep 3, 2017 · Failed to construct kafka producer. I'm using Kafka version 0.11.0.0 and trying to create an input stream by loading data from avro file.But it fails in instantiating the Producer with the exception: [main] INFO org.apache.kafka.clients.producer.KafkaProducer - Closing the Kafka producer with timeoutMillis = 0 ms. Jul 9, 2022 · Solution 1 ⭐ Caused by: java.lang.ClassNotFoundException: org.apache.kafka.common.ClusterResourceListener You are missing the kafka-clients jar from your class path. What are you using for dep... Nov 1, 2021 · Getting Failed to construct kafka producer when running the app in azure kubernates. I have a Springboot application which sends a message to a Topic (Lenses Kafka) The application is running fine when i run in my local environment but when i deploy my app in aks spoke 2 cluster it is giving me failed to construct kafka producer . Oct 9, 2019 · Part of AWS Collective. 1. I have a Spark job that consumes data from a secured Kafka topic. This works when the truststore.jks is physically present where the job is running. However, if I point to my S3 bucket for Spark to grab the JKS file, this fails. This is what my job looks like: Aug 14, 2020 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question.Provide details and share your research! But avoid …. Asking for help, clarification, or responding to other answers. Feb 2, 2022 · os.getcwd() gets evaluated on the driver, not the executors where the file locations are actually used. You should try using --files to send the certs to the the executors. . Then, you'll want to modify the path in the config to pickup from the executor directo Jan 22, 2021 · To display the conditions report re-run your application with 'debug' enabled. 2021-01-22 19:36:06.216 ERROR 61013 --- [ main] o.s.boot.SpringApplication : Application run failed org.springframework.context.ApplicationContextException: Failed to start bean 'org.springframework.kafka.config.internalKafkaListenerEndpointRegistry'; nested ... 12. 这里从报错来看很明显了. producer： org.apache.kafka.common.serialization.StringSerializer. consumer：org.apache.kafka.common.serialization.StringDeserializer. 一个是序列化一个是反序列化，两个并不一样。. 查看配置文件。. 确认API版本号与安装包版本号是否一致：. 如果安装的是kafka ... Oct 18, 2019 · Flume 中依赖的第三方 jar (Kafka的jar) 发生改变了, 需要重新编译。. 项目中所依赖的 API 如果发生更改，即使在源代码中不需要进行任何更改，也应重新编译。. 如果 API 未发生更改，则无需重新编译。. 所以要解决上述异常，需要将 flume-kafka-source 中依赖的 Kafka 版本 ... org.apache.kafka.common.KafkaException: Failed to construct kafka producer ... Exception in thread "Thread-11" org.apache.kafka.common.KafkaException: Failed to ... Jul 22, 2019 · Have a look at the server log; most likely you don't have enough replicas to support transactions (3 by default). You can set it to 1 if you are only testing. Feb 23, 2018 · org.apache.kafka.common.KafkaException: Failed to construct kafka consumer The text was updated successfully, but these errors were encountered: 👍 5 luisfsantana, anushreeringne, osboo, raushendra1, and prasanna-sk reacted with thumbs up emoji Sep 23, 2019 · I'm trying to set up a Spark job to consume data from Kafka. The Kafka brokers have SSL set up, but I'm not able to properly build/authenticate the consumer. spark-shell command: spark-2.3.4-bin- Jul 25, 2018 · 问题概述 我们用spark streaming 消费kafka数据，偶尔会出现该问题，其本质原因是多个进程以相同的kafka group id 并行消费同一个topic导致的，碰到该问题，应首先从迅速下面2个方面排查： 多个应用程序使用了相同的kafka group id 去消费同一个topic 一个应用程序，在内部不小心间接地启动了2个消费进程，这 ... Oct 9, 2019 · Part of AWS Collective. 1. I have a Spark job that consumes data from a secured Kafka topic. This works when the truststore.jks is physically present where the job is running. However, if I point to my S3 bucket for Spark to grab the JKS file, this fails. This is what my job looks like: Aug 23, 2022 · Boot 2.3 uses spring-kafka 2.5 by default (and kafka-clients 2.5.0); since you have overridden its prescribed spring-kafka version to 2.6.5, you must override all of the kafka dependencies to match. kafka-clients 2.6.1, kafka-streams 2.6.1 (if you are using them). If you are using the embedded Kafka broker in tests, there are a bunch of other ... Sep 3, 2017 · Failed to construct kafka producer. I'm using Kafka version 0.11.0.0 and trying to create an input stream by loading data from avro file.But it fails in instantiating the Producer with the exception: [main] INFO org.apache.kafka.clients.producer.KafkaProducer - Closing the Kafka producer with timeoutMillis = 0 ms. May 19, 2022 · Caused by: org.apache.kafka.common.KafkaException: javax.security.auth.login.LoginException: Could not login: the client is being asked for a password, but the Kafka client code does not currently support obtaining a password from the user. not available to garner authentication information from the user ERROR: "Failed to construct kafka consumer. Cause: org.apache.kafka.common.KafkaException: org.apache.kafka.common.KafkaException: Failed to load SSL keystore <E:\FlatFileArea\Kafka\DI\xcerts> of type JKS." while testing the kafka connection in CDI ERROR: "Failed to construct kafka consumer. Dec 7, 2018 · Note: Databricks shades the Kafka client under the kafkashaded package. If you are using Databricks to run Spark, make sure to update all occurrences of org.apache.kafka.common.security.plain.PlainLoginModule to kafkashaded.org.apache.kafka.common.security.plain.PlainLoginModule in these samples! Dec 9, 2016 · I run with logstash5.0 kafka plugin, got below message, and not sure why is it a ArgumentError, and which argument is wrong, any ideas?? [2016-12-09T16:32:43,420][DEBUG][org.apache.kafka.clients.consumer.KafkaConsumer] Starting the Kafka consumer [2016-12-09T16:32:43,420][DEBUG][org.apache.kafka.clients.consumer.KafkaConsumer] The Kafka consumer has closed. [2016-12-09T16:32:43,420][ERROR ... May 18, 2022 · Last published at: May 18th, 2022 Problem You are trying to read or write data to a Kafka stream when you get an error message. kafkashaded.org.apache.kafka.common.KafkaException: Failed to construct kafka consumer Caused by: kafkashaded.org.apache.kafka.common.config.ConfigException: No resolvable bootstrap urls given in bootstrap.servers May 19, 2022 · Caused by: org.apache.kafka.common.KafkaException: javax.security.auth.login.LoginException: Could not login: the client is being asked for a password, but the Kafka client code does not currently support obtaining a password from the user. not available to garner authentication information from the user Jul 9, 2022 · Solution 1 ⭐ Caused by: java.lang.ClassNotFoundException: org.apache.kafka.common.ClusterResourceListener You are missing the kafka-clients jar from your class path. What are you using for dep...
Oct 13, 2020 · 1 Answer. Sorted by: 4. You are using a StringSerializer but should use a StringDeserializer, one serializes, the other de serializes. And since you set them for ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG and ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG you apparently want to de serialize. config.put (ConsumerConfig.KEY_DESERIALIZER_CLASS ... . 612 478 0003
Dec 13, 2020 · spring集成kafka运行时报错：Failed to construct kafka producer] with root cause org.apache.kafka.common.KafkaException: class org.apache.kafka.common.serialization.StringDeserializer is not an instance of org.apache.kafka.common.serialization.Serializer 如图： Sep 10, 2021 · 1. I tried a simple sample code to test access to a "kerberized" Kafka from Quarkus 2.2.2 with smallrye-reactive-messaging-kafka : package org.acme; import org.apache.kafka.clients.consumer.ConsumerRecord; import org.eclipse.microprofile.reactive.messaging.Incoming; import javax.enterprise.context.ApplicationScoped; @ApplicationScoped public ... Apr 12, 2018 · In my case, I am having Kafka binary kafka_2.11-1.0.0 install both on server and client side, but after creating the topic my consumer is not working when I was using --bootstrap-server instead of --zookeeper. And I changed as per warning coming. Oct 18, 2019 · Flume 中依赖的第三方 jar (Kafka的jar) 发生改变了, 需要重新编译。. 项目中所依赖的 API 如果发生更改，即使在源代码中不需要进行任何更改，也应重新编译。. 如果 API 未发生更改，则无需重新编译。. 所以要解决上述异常，需要将 flume-kafka-source 中依赖的 Kafka 版本 ... Jun 30, 2020 · The correct form is kafka: [topicname]? [options] (check Camel-Kafka docs) One of the kafka: [topicname] is kafka: [brokers], remove it. Zookeeper options for old versions of camel-kafka, remove them. By the way: The line SLF4J: Defaulting to no-operation (NOP) logger implementation on top of your stacktrace says that you use SLF4J logging ... Jan 25, 2022 · I am getting intermittent issues while accessing the kafka service from the Kubernetes pod. org.apache.kafka.common.KafkaException: Failed to construct kafka producer at org.apache.kafka.clients. May 4, 2020 · You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. Reload to refresh your session. You switched accounts on another tab or window. Oct 12, 2022 · Running into issues when trying to use kerberos auth with connecting to Kafka. Using scala and my jaas.config looks something like this. KafkaClient { com.sun.security.auth.module. Oct 9, 2019 · Part of AWS Collective. 1. I have a Spark job that consumes data from a secured Kafka topic. This works when the truststore.jks is physically present where the job is running. However, if I point to my S3 bucket for Spark to grab the JKS file, this fails. This is what my job looks like: I am using the Apache Drill (1.14) JDBC driver in my application which consumes the data from the Kafka. The application works just fine for some time and after few iterations it fails to execute due to the following Too many files open issue. Oct 13, 2020 · 1 Answer. Sorted by: 4. You are using a StringSerializer but should use a StringDeserializer, one serializes, the other de serializes. And since you set them for ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG and ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG you apparently want to de serialize. config.put (ConsumerConfig.KEY_DESERIALIZER_CLASS ... .