Demo Application to create Kafka Producer throws "Failed to construct kafka producer" error for java.lang.InstantiationException: null - spring

Question

I am writing a demo application to create a Kafka Producer. I created a topic and ran a producer and consumer on Kafka, it seems to be working. I am writing a spring application to create a producer.I'm passing the name as part of the call. When I go to "http://localhost:8080/kafka/publish/Peter", I'm getting a whitelabel error "Failed to construct kafka producer". Please help.
The main application is:
SpringBootKafkaProducerApplication.java
package com.ranjana.demo.kafka.springbootkafkaproducer;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
public class SpringBootKafkaProducerApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBootKafkaProducerApplication.class, args);
}
}
The model is :
User.java
package com.ranjana.demo.kafka.springbootkafkaproducer.model;
public class User {
private String name;
private String Department;
private Long Salary;
public User(String name, String department, Long salary) {
this.name = name;
Department = department;
Salary = salary;
}
//Getters and setters
}
The controller is UserResourse.java
package com.ranjana.demo.kafka.springbootkafkaproducer.resource;
import com.ranjana.demo.kafka.springbootkafkaproducer.model.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
#RestController
#RequestMapping("kafka")
public class UserResource {
#Autowired
KafkaTemplate<String, User> kafkaTemplate;
private static final String TOPIC = "demo_topic";
#GetMapping("/publish/{name}")
public String post(#PathVariable("name") final String name){
kafkaTemplate.send(TOPIC, new User(name, "Technology", 12000L));
return "Published Successfully";
}
}
There is also this configuration file:
KafkaConfiguration.java
package com.ranjana.demo.kafka.springbootkafkaproducer.config;
import com.ranjana.demo.kafka.springbootkafkaproducer.model.User;
import com.fasterxml.jackson.databind.JsonSerializer;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.common.serialization.StringSerializer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.core.DefaultKafkaProducerFactory;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.kafka.core.ProducerFactory;
import java.util.HashMap;
import java.util.Map;
#Configuration
public class KafkaConfiguration {
#Bean
public ProducerFactory<String, User> producerFactory(){
Map<String, Object> config = new HashMap<>();
config.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "127.0.0.1:9092");
config.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
config.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, JsonSerializer.class);
return new DefaultKafkaProducerFactory<>(config);
}
#Bean
public KafkaTemplate<String, User> kafkaTemplate(){
return new KafkaTemplate<>(producerFactory());
}
}
My application.properties has:
server.port=8080
The error on http://localhost:8080/kafka/publish/Peter is:
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Fri Aug 09 12:36:10 CDT 2019
There was an unexpected error (type=Internal Server Error, status=500).
Failed to construct kafka producer
Also the console shows:
"/Applications/IntelliJ IDEA.app/Contents/jbr/Contents/Home/bin/java" -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-javaagent:/Applications/IntelliJ IDEA.app/Contents/lib/idea_rt.jar=56874:/Applications/IntelliJ IDEA.app/Contents/bin" -Dfile.encoding=UTF-8 -classpath /Users/ranjanasinha/ransinha/spring-boot-kafka-producer/target/classes:/Users/ranjanasinha/.m2/repository/org/springframework/boot/spring-boot-starter-web/2.1.7.RELEASE/spring-boot-starter-web-2.1.7.RELEASE.jar:/Users/ranjanasinha/.m2/repository/org/springframework/boot/spring-boot-starter/2.1.7.RELEASE/spring-boot-starter-2.1.7.RELEASE.jar:/Users/ranjanasinha/.m2/repository/org/springframework/boot/spring-boot/2.1.7.RELEASE/spring-boot-2.1.7.RELEASE.jar:/Users/ranjanasinha/.m2/repository/org/springframework/boot/spring-boot-autoconfigure/2.1.7.RELEASE/spring-boot-autoconfigure-2.1.7.RELEASE.jar:/Users/ranjanasinha/.m2/repository/org/springframework/boot/spring-boot-starter-logging/2.1.7.RELEASE/spring-boot-starter-logging-2.1.7.RELEASE.jar:/Users/ranjanasinha/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar:/Users/ranjanasinha/.m2/repository/ch/qos/logback/logback-core/1.2.3/logback-core-1.2.3.jar:/Users/ranjanasinha/.m2/repository/org/apache/logging/log4j/log4j-to-slf4j/2.11.2/log4j-to-slf4j-2.11.2.jar:/Users/ranjanasinha/.m2/repository/org/apache/logging/log4j/log4j-api/2.11.2/log4j-api-2.11.2.jar:/Users/ranjanasinha/.m2/repository/org/slf4j/jul-to-slf4j/1.7.26/jul-to-slf4j-1.7.26.jar:/Users/ranjanasinha/.m2/repository/javax/annotation/javax.annotation-api/1.3.2/javax.annotation-api-1.3.2.jar:/Users/ranjanasinha/.m2/repository/org/yaml/snakeyaml/1.23/snakeyaml-1.23.jar:/Users/ranjanasinha/.m2/repository/org/springframework/boot/spring-boot-starter-json/2.1.7.RELEASE/spring-boot-starter-json-2.1.7.RELEASE.jar:/Users/ranjanasinha/.m2/repository/com/fasterxml/jackson/core/jackson-databind/2.9.9/jackson-databind-2.9.9.jar:/Users/ranjanasinha/.m2/repository/com/fasterxml/jackson/core/jackson-annotations/2.9.0/jackson-annotations-2.9.0.jar:/Users/ranjanasinha/.m2/repository/com/fasterxml/jackson/core/jackson-core/2.9.9/jackson-core-2.9.9.jar:/Users/ranjanasinha/.m2/repository/com/fasterxml/jackson/datatype/jackson-datatype-jdk8/2.9.9/jackson-datatype-jdk8-2.9.9.jar:/Users/ranjanasinha/.m2/repository/com/fasterxml/jackson/datatype/jackson-datatype-jsr310/2.9.9/jackson-datatype-jsr310-2.9.9.jar:/Users/ranjanasinha/.m2/repository/com/fasterxml/jackson/module/jackson-module-parameter-names/2.9.9/jackson-module-parameter-names-2.9.9.jar:/Users/ranjanasinha/.m2/repository/org/springframework/boot/spring-boot-starter-tomcat/2.1.7.RELEASE/spring-boot-starter-tomcat-2.1.7.RELEASE.jar:/Users/ranjanasinha/.m2/repository/org/apache/tomcat/embed/tomcat-embed-core/9.0.22/tomcat-embed-core-9.0.22.jar:/Users/ranjanasinha/.m2/repository/org/apache/tomcat/embed/tomcat-embed-el/9.0.22/tomcat-embed-el-9.0.22.jar:/Users/ranjanasinha/.m2/repository/org/apache/tomcat/embed/tomcat-embed-websocket/9.0.22/tomcat-embed-websocket-9.0.22.jar:/Users/ranjanasinha/.m2/repository/org/hibernate/validator/hibernate-validator/6.0.17.Final/hibernate-validator-6.0.17.Final.jar:/Users/ranjanasinha/.m2/repository/javax/validation/validation-api/2.0.1.Final/validation-api-2.0.1.Final.jar:/Users/ranjanasinha/.m2/repository/org/jboss/logging/jboss-logging/3.3.2.Final/jboss-logging-3.3.2.Final.jar:/Users/ranjanasinha/.m2/repository/com/fasterxml/classmate/1.4.0/classmate-1.4.0.jar:/Users/ranjanasinha/.m2/repository/org/springframework/spring-web/5.1.9.RELEASE/spring-web-5.1.9.RELEASE.jar:/Users/ranjanasinha/.m2/repository/org/springframework/spring-beans/5.1.9.RELEASE/spring-beans-5.1.9.RELEASE.jar:/Users/ranjanasinha/.m2/repository/org/springframework/spring-webmvc/5.1.9.RELEASE/spring-webmvc-5.1.9.RELEASE.jar:/Users/ranjanasinha/.m2/repository/org/springframework/spring-aop/5.1.9.RELEASE/spring-aop-5.1.9.RELEASE.jar:/Users/ranjanasinha/.m2/repository/org/springframework/spring-expression/5.1.9.RELEASE/spring-expression-5.1.9.RELEASE.jar:/Users/ranjanasinha/.m2/repository/org/springframework/kafka/spring-kafka/2.2.8.RELEASE/spring-kafka-2.2.8.RELEASE.jar:/Users/ranjanasinha/.m2/repository/org/springframework/spring-context/5.1.9.RELEASE/spring-context-5.1.9.RELEASE.jar:/Users/ranjanasinha/.m2/repository/org/springframework/spring-messaging/5.1.9.RELEASE/spring-messaging-5.1.9.RELEASE.jar:/Users/ranjanasinha/.m2/repository/org/springframework/spring-tx/5.1.9.RELEASE/spring-tx-5.1.9.RELEASE.jar:/Users/ranjanasinha/.m2/repository/org/springframework/retry/spring-retry/1.2.4.RELEASE/spring-retry-1.2.4.RELEASE.jar:/Users/ranjanasinha/.m2/repository/org/apache/kafka/kafka-clients/2.0.1/kafka-clients-2.0.1.jar:/Users/ranjanasinha/.m2/repository/org/lz4/lz4-java/1.4.1/lz4-java-1.4.1.jar:/Users/ranjanasinha/.m2/repository/org/xerial/snappy/snappy-java/1.1.7.1/snappy-java-1.1.7.1.jar:/Users/ranjanasinha/.m2/repository/org/slf4j/slf4j-api/1.7.26/slf4j-api-1.7.26.jar:/Users/ranjanasinha/.m2/repository/org/springframework/spring-core/5.1.9.RELEASE/spring-core-5.1.9.RELEASE.jar:/Users/ranjanasinha/.m2/repository/org/springframework/spring-jcl/5.1.9.RELEASE/spring-jcl-5.1.9.RELEASE.jar com.ranjana.demo.kafka.springbootkafkaproducer.SpringBootKafkaProducerApplication
. ____ _ __ _ _
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( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.7.RELEASE)
2019-08-09 12:50:39.250 INFO 14006 --- [ main] d.k.s.SpringBootKafkaProducerApplication : Starting SpringBootKafkaProducerApplication on Egens-MacBook-Pro.local with PID 14006 (/Users/ranjanasinha/ransinha/spring-boot-kafka-producer/target/classes started by ranjanasinha in /Users/ranjanasinha/ransinha/spring-boot-kafka-producer)
2019-08-09 12:50:39.252 INFO 14006 --- [ main] d.k.s.SpringBootKafkaProducerApplication : No active profile set, falling back to default profiles: default
2019-08-09 12:50:39.776 INFO 14006 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.kafka.annotation.KafkaBootstrapConfiguration' of type [org.springframework.kafka.annotation.KafkaBootstrapConfiguration$$EnhancerBySpringCGLIB$$62e8d338] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2019-08-09 12:50:39.964 INFO 14006 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2019-08-09 12:50:39.985 INFO 14006 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2019-08-09 12:50:39.985 INFO 14006 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.22]
2019-08-09 12:50:40.044 INFO 14006 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2019-08-09 12:50:40.044 INFO 14006 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 755 ms
2019-08-09 12:50:40.235 INFO 14006 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2019-08-09 12:50:40.410 INFO 14006 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2019-08-09 12:50:40.415 INFO 14006 --- [ main] d.k.s.SpringBootKafkaProducerApplication : Started SpringBootKafkaProducerApplication in 1.383 seconds (JVM running for 6.925)
2019-08-09 12:50:50.531 INFO 14006 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2019-08-09 12:50:50.531 INFO 14006 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2019-08-09 12:50:50.536 INFO 14006 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 5 ms
2019-08-09 12:50:50.565 INFO 14006 --- [nio-8080-exec-1] o.a.k.clients.producer.ProducerConfig : ProducerConfig values:
acks = 1
batch.size = 16384
bootstrap.servers = [127.0.0.1:9092]
buffer.memory = 33554432
client.id =
compression.type = none
connections.max.idle.ms = 540000
enable.idempotence = false
interceptor.classes = []
key.serializer = class org.apache.kafka.common.serialization.StringSerializer
linger.ms = 0
max.block.ms = 60000
max.in.flight.requests.per.connection = 5
max.request.size = 1048576
metadata.max.age.ms = 300000
metric.reporters = []
metrics.num.samples = 2
metrics.recording.level = INFO
metrics.sample.window.ms = 30000
partitioner.class = class org.apache.kafka.clients.producer.internals.DefaultPartitioner
receive.buffer.bytes = 32768
reconnect.backoff.max.ms = 1000
reconnect.backoff.ms = 50
request.timeout.ms = 30000
retries = 0
retry.backoff.ms = 100
sasl.client.callback.handler.class = null
sasl.jaas.config = null
sasl.kerberos.kinit.cmd = /usr/bin/kinit
sasl.kerberos.min.time.before.relogin = 60000
sasl.kerberos.service.name = null
sasl.kerberos.ticket.renew.jitter = 0.05
sasl.kerberos.ticket.renew.window.factor = 0.8
sasl.login.callback.handler.class = null
sasl.login.class = null
sasl.login.refresh.buffer.seconds = 300
sasl.login.refresh.min.period.seconds = 60
sasl.login.refresh.window.factor = 0.8
sasl.login.refresh.window.jitter = 0.05
sasl.mechanism = GSSAPI
security.protocol = PLAINTEXT
send.buffer.bytes = 131072
ssl.cipher.suites = null
ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1]
ssl.endpoint.identification.algorithm = https
ssl.key.password = null
ssl.keymanager.algorithm = SunX509
ssl.keystore.location = null
ssl.keystore.password = null
ssl.keystore.type = JKS
ssl.protocol = TLS
ssl.provider = null
ssl.secure.random.implementation = null
ssl.trustmanager.algorithm = PKIX
ssl.truststore.location = null
ssl.truststore.password = null
ssl.truststore.type = JKS
transaction.timeout.ms = 60000
transactional.id = null
value.serializer = class com.fasterxml.jackson.databind.JsonSerializer
2019-08-09 12:50:50.572 INFO 14006 --- [nio-8080-exec-1] o.a.k.clients.producer.KafkaProducer : [Producer clientId=producer-1] Closing the Kafka producer with timeoutMillis = 0 ms.
2019-08-09 12:50:50.581 ERROR 14006 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.apache.kafka.common.KafkaException: Failed to construct kafka producer] with root cause
java.lang.InstantiationException: null
at java.base/jdk.internal.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(InstantiationExceptionConstructorAccessorImpl.java:48) ~[na:na]
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490) ~[na:na]
at org.apache.kafka.common.utils.Utils.newInstance(Utils.java:306) ~[kafka-clients-2.0.1.jar:na]
at org.apache.kafka.common.config.AbstractConfig.getConfiguredInstance(AbstractConfig.java:302) ~[kafka-clients-2.0.1.jar:na]
at org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:370) ~[kafka-clients-2.0.1.jar:na]
at org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:289) ~[kafka-clients-2.0.1.jar:na]
at org.springframework.kafka.core.DefaultKafkaProducerFactory.createKafkaProducer(DefaultKafkaProducerFactory.java:318) ~[spring-kafka-2.2.8.RELEASE.jar:2.2.8.RELEASE]
at org.springframework.kafka.core.DefaultKafkaProducerFactory.createProducer(DefaultKafkaProducerFactory.java:305) ~[spring-kafka-2.2.8.RELEASE.jar:2.2.8.RELEASE]
at org.springframework.kafka.core.KafkaTemplate.getTheProducer(KafkaTemplate.java:448) ~[spring-kafka-2.2.8.RELEASE.jar:2.2.8.RELEASE]
at org.springframework.kafka.core.KafkaTemplate.doSend(KafkaTemplate.java:378) ~[spring-kafka-2.2.8.RELEASE.jar:2.2.8.RELEASE]
at org.springframework.kafka.core.KafkaTemplate.send(KafkaTemplate.java:193) ~[spring-kafka-2.2.8.RELEASE.jar:2.2.8.RELEASE]
at com.ranjana.demo.kafka.springbootkafkaproducer.resource.UserResource.post(UserResource.java:32) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:892) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1039) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) ~[spring-webmvc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.22.jar:9.0.22]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:853) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.22.jar:9.0.22]
at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]
And the pom.xml is:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.7.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.egen.demo.kafka</groupId>
<artifactId>spring-boot-kafka-producer</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring-boot-kafka-producer</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

Answer 1

From your console logs
value.serializer = class com.fasterxml.jackson.databind.JsonSerializer
Instead of the serializer from jackson use org.springframework.kafka.support.serializer.JsonSerializer
An exception is occurring when trying to construct the instance of the class corresponding to VALUE_SERIALIZER_CLASS_CONFIG property.
The value of VALUE_SERIALIZER_CLASS_CONFIG must be a class which implements the org.apache.kafka.common.serialization.Serializer interface.
jackson.databind.JsonSerializer doesn't satisfy this criteria and results in an InstantiationException. So use org.springframework.kafka.support.serializer.JsonSerializer which implements the above mentioned Serializer interface.

Answer 2

I have gone through this issue once I started learning Kafka
What is the issue here:
Wrong JsonSerializer class has been imported by the IDE.
What to Do:
When ever you are constructing object ProducerFactory, make sure that you are importing correct class file. In this case, when you write JsonSerializer.class then by default IDE may pick wrong classes hence we need to correct JsonSerializer.class
so import of JsonSerializer.class in this as below config.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, JsonSerializer.class);
and it must be org.springframework.kafka.support.serializer.JsonSerializer instead of com.fasterxml.jackson.databind.JsonSerializer
Happy Coding!!