rocketmq Cannot construct instance of `java.time.LocalDateTime` (no Creators-Toy模板网

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原因：RocketMQ内置使用的转换器是RocketMQMessageConverter，转换Json时使用的是MappingJackson2MessageConverter，但是这个转换器不支持时间类型。

解决办法是：文章来源地址https://www.toymoban.com/news/detail-573146.html

添加消息转换器，将MappingJackson2MessageConverter进行替换，并添加支持时间模块

package icu.kevin.mq.rocketmq.config;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import org.apache.rocketmq.spring.support.RocketMQMessageConverter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.messaging.converter.CompositeMessageConverter;
import org.springframework.messaging.converter.MappingJackson2MessageConverter;
import org.springframework.messaging.converter.MessageConverter;

import java.util.List;

@Configuration
public class RocketMQEnhanceConfig {

    /**
     * 解决RocketMQ Jackson不支持Java时间类型配置
     */
    @Bean
    @Primary
    public RocketMQMessageConverter enhanceRocketMQMessageConverter(){
        RocketMQMessageConverter converter = new RocketMQMessageConverter();
        CompositeMessageConverter compositeMessageConverter = (CompositeMessageConverter) converter.getMessageConverter();
        List<MessageConverter> messageConverterList = compositeMessageConverter.getConverters();

        for (MessageConverter messageConverter : messageConverterList) {
            if(messageConverter instanceof MappingJackson2MessageConverter){
                MappingJackson2MessageConverter jackson2MessageConverter = (MappingJackson2MessageConverter) messageConverter;
                ObjectMapper objectMapper = jackson2MessageConverter.getObjectMapper();
                objectMapper.registerModules(new JavaTimeModule());
            }
        }
        return converter;
    }

}

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