问题
I am working on Spring Cloud Stream Apache Kafka example. I am developing code taking reference from : https://www.youtube.com/watch?v=YPDzcmqwCNo.
org.springframework.messaging.MessageDeliveryException: failed to send Message to channel 'pvout'; nested exception is org.springframework.messaging.converter.MessageConversionException: Could not write JSON: No serializer found for class org.springframework.core.convert.support.DefaultConversionService and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: org.springframework.cloud.stream.messaging.DirectWithAttributesChannel["conversionService"]); nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class org.springframework.core.convert.support.DefaultConversionService and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: org.springframework.cloud.stream.messaging.DirectWithAttributesChannel["conversionService"])
at org.springframework.integration.support.utils.IntegrationUtils.wrapInDeliveryExceptionIfNecessary(IntegrationUtils.java:166) ~[spring-integration-core-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:483) ~[spring-integration-core-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:403) ~[spring-integration-core-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at com.example.SpringCloudStreamKafkaStreamsJlongApplication$PageViewEventSource.lambda$run$0(SpringCloudStreamKafkaStreamsJlongApplication.java:56) ~[classes/:na]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[na:1.8.0_151]
at java.util.concurrent.FutureTask.runAndReset(Unknown Source) ~[na:1.8.0_151]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(Unknown Source) ~[na:1.8.0_151]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source) ~[na:1.8.0_151]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) ~[na:1.8.0_151]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) ~[na:1.8.0_151]
at java.lang.Thread.run(Unknown Source) ~[na:1.8.0_151]
Caused by: org.springframework.messaging.converter.MessageConversionException: Could not write JSON: No serializer found for class org.springframework.core.convert.support.DefaultConversionService and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: org.springframework.cloud.stream.messaging.DirectWithAttributesChannel["conversionService"]); nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class org.springframework.core.convert.support.DefaultConversionService and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: org.springframework.cloud.stream.messaging.DirectWithAttributesChannel["conversionService"])
at org.springframework.messaging.converter.MappingJackson2MessageConverter.convertToInternal(MappingJackson2MessageConverter.java:285) ~[spring-messaging-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.cloud.stream.converter.ApplicationJsonMessageMarshallingConverter.convertToInternal(ApplicationJsonMessageMarshallingConverter.java:71) ~[spring-cloud-stream-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.messaging.converter.AbstractMessageConverter.toMessage(AbstractMessageConverter.java:217) ~[spring-messaging-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.messaging.converter.AbstractMessageConverter.toMessage(AbstractMessageConverter.java:207) ~[spring-messaging-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.messaging.converter.CompositeMessageConverter.toMessage(CompositeMessageConverter.java:83) ~[spring-messaging-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.cloud.stream.binding.MessageConverterConfigurer$OutboundContentTypeConvertingInterceptor.doPreSend(MessageConverterConfigurer.java:263) ~[spring-cloud-stream-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.cloud.stream.binding.MessageConverterConfigurer$AbstractContentTypeInterceptor.preSend(MessageConverterConfigurer.java:295) ~[spring-cloud-stream-3.0.3.RELEASE.jar:3.0.3.RELEASE]
at org.springframework.integration.channel.AbstractMessageChannel$ChannelInterceptorList.preSend(AbstractMessageChannel.java:613) ~[spring-integration-core-5.2.2.RELEASE.jar:5.2.2.RELEASE]
at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:443) ~[spring-integration-core-5.2.2.RELEASE.jar:5.2.2.RELEASE]
... 9 common frames omitted
Caused by: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class org.springframework.core.convert.support.DefaultConversionService and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: org.springframework.cloud.stream.messaging.DirectWithAttributesChannel["conversionService"])
at com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:77) ~[jackson-databind-2.10.1.jar:2.10.1]
at com.fasterxml.jackson.databind.SerializerProvider.reportBadDefinition(SerializerProvider.java:1191) ~[jackson-databind-2.10.1.jar:2.10.1]
at com.fasterxml.jackson.databind.DatabindContext.reportBadDefinition(DatabindContext.java:404) ~[jackson-databind-2.10.1.jar:2.10.1]
at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.failForEmpty(UnknownSerializer.java:71) ~[jackson-databind-2.10.1.jar:2.10.1]
at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.serialize(UnknownSerializer.java:33) ~[jackson-databind-2.10.1.jar:2.10.1]
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~[jackson-databind-2.10.1.jar:2.10.1]
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:722) ~[jackson-databind-2.10.1.jar:2.10.1]
at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:166) ~[jackson-databind-2.10.1.jar:2.10.1]
at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480) ~[jackson-databind-2.10.1.jar:2.10.1]
at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:319) ~[jackson-databind-2.10.1.jar:2.10.1]
at com.fasterxml.jackson.databind.ObjectMapper.writeValue(ObjectMapper.java:2795) ~[jackson-databind-2.10.1.jar:2.10.1]
at org.springframework.messaging.converter.MappingJackson2MessageConverter.convertToInternal(MappingJackson2MessageConverter.java:269) ~[spring-messaging-5.2.2.RELEASE.jar:5.2.2.RELEASE]
... 17 common frames omitted
Code:
@Slf4j
@SpringBootApplication
@EnableBinding(AnalyticsBinding.class)
public class SpringCloudStreamKafkaStreamsJlongApplication {
@Component
public static class PageViewEventSource implements ApplicationRunner{
private final MessageChannel pageViewOut;
public PageViewEventSource(AnalyticsBinding binding) {
this.pageViewOut = binding.pageViewOut();
}
@Override
public void run(ApplicationArguments args) throws Exception {
List<String> names = java.util.Arrays.asList("jlong", "sNinawe", "sKarande", "sParate", "nDekate", "kNimje");
List<String> pages = java.util.Arrays.asList("blog", "sitemap", "initializr", "news", "cricket", "football");
Runnable runnable = () -> {
String rPage = pages.get(new Random().nextInt(pages.size()));
String rName = pages.get(new Random().nextInt(pages.size()));
PageViewEvent pageViewEvent = new PageViewEvent(rName, rPage, Math.random() > .5 ? 10 : 1000);
Message<MessageChannel> message = MessageBuilder.withPayload(pageViewOut)
.setHeader(KafkaHeaders.MESSAGE_KEY, pageViewEvent.getUserId().getBytes())
.build();
try {
this.pageViewOut.send(message);
log.info("Sent "+ message.toString());
} catch (Exception e) {
log.error("", e);
}
};
Executors.newScheduledThreadPool(1).scheduleAtFixedRate(runnable, 1, 1, TimeUnit.SECONDS);
}
}
public static void main(String[] args) {
SpringApplication.run(SpringCloudStreamKafkaStreamsJlongApplication.class, args);
}
}
interface AnalyticsBinding{
String PAGE_VIEW_OUT = "pvout";
@Output(PAGE_VIEW_OUT)
MessageChannel pageViewOut();
}
@Data
@AllArgsConstructor
@NoArgsConstructor
@Builder
class PageViewEvent{
private String userId, page;
private long duration;
}
application.properties
spring.cloud.stream.kafka.streams.binder.configuration.commit.interval.mms=100
spring.cloud.stream.kafka.streams.binder.configuration.default.key.serde=org.apache.kafka.common.serialization.Serdes$StringSerde
spring.cloud.stream.kafka.streams.binder.configuration.default.value.serde=org.apache.kafka.common.serialization.Serdes$StringSerde
#
# page view out
spring.cloud.stream.bindings.pvout.destination=pvs
spring.cloud.stream.bindings.pvout.producer.header-mode=headers
pom.xml
<?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 https://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>2.2.2.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>spring-cloud-stream-kafka-streams-jlong</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring-cloud-stream-kafka-streams-jlong</name>
<description>Spring Boot Open API Spec</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Hoxton.SR3</spring-cloud.version>
<maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<!-- Web -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-stream</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-stream-binder-kafka-streams</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-stream-binder-kafka</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka</artifactId>
</dependency>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-streams</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-stream-test-support</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
回答1:
It looks like that application is a bit behind with the versions used for Spring Boot and Spring Cloud. The concepts explained in that tutorial are still perfectly valid though. I sent a PR to the original repository used for that spring-tips in which I updated the versions used. More importantly, the actual code is also upgraded to reflect the latest recommended functional model of writing components in Spring Cloud Stream. I hope that helps.
来源：https://stackoverflow.com/questions/61289866/caused-by-com-fasterxml-jackson-databind-exc-invaliddefinitionexception-no-ser