Question

如何指示我的端点（或理想情况下，全局：所有端点）在发送之前需要将POJO转换为application/json格式？

说，我有一个REST控制器，它将端点注入rabbitmq交换，我希望通过这个交换发送的对象被序列化为json，不知何故这样：

@RestController
public class Partners {
    @EndpointInject(uri = "rabbitmq:core/partners/create")
    private ProducerTemplate partnersCreate;

    @RequestMapping("/partners/create")
    public Partner create(Partner partner) {

        return partnersCreate.requestBody(partner, Partner.class);
    }
}

但问题是骆驼显然不知道如何处理POJO：

org.apache.camel.NoTypeConversionAvailableException: No type converter available to convert from type: com.example.core.client.model.Partner to the required type: byte[] with value com.example.core.client.model.Partner@29069cf5
at org.apache.camel.impl.converter.BaseTypeConverterRegistry.mandatoryConvertTo(BaseTypeConverterRegistry.java:206) ~[camel-core-2.21.1.jar:2.21.1]
at org.apache.camel.component.rabbitmq.RabbitMQMessagePublisher.publish(RabbitMQMessagePublisher.java:86) ~[camel-rabbitmq-2.21.1.jar:2.21.1]
at org.apache.camel.component.rabbitmq.RabbitMQEndpoint.publishExchangeToChannel(RabbitMQEndpoint.java:216) ~[camel-rabbitmq-2.21.1.jar:2.21.1]
at org.apache.camel.component.rabbitmq.RabbitMQProducer$2.doWithChannel(RabbitMQProducer.java:289) ~[camel-rabbitmq-2.21.1.jar:2.21.1]
at org.apache.camel.component.rabbitmq.RabbitMQProducer$2.doWithChannel(RabbitMQProducer.java:286) ~[camel-rabbitmq-2.21.1.jar:2.21.1]
at org.apache.camel.component.rabbitmq.RabbitMQProducer.execute(RabbitMQProducer.java:90) ~[camel-rabbitmq-2.21.1.jar:2.21.1]
at org.apache.camel.component.rabbitmq.RabbitMQProducer.basicPublish(RabbitMQProducer.java:286) ~[camel-rabbitmq-2.21.1.jar:2.21.1]
at org.apache.camel.component.rabbitmq.RabbitMQProducer.processInOut(RabbitMQProducer.java:244) ~[camel-rabbitmq-2.21.1.jar:2.21.1]
at org.apache.camel.component.rabbitmq.RabbitMQProducer.process(RabbitMQProducer.java:193) ~[camel-rabbitmq-2.21.1.jar:2.21.1]
at org.apache.camel.processor.SharedCamelInternalProcessor.process(SharedCamelInternalProcessor.java:186) ~[camel-core-2.21.1.jar:2.21.1]
at org.apache.camel.processor.SharedCamelInternalProcessor.process(SharedCamelInternalProcessor.java:86) ~[camel-core-2.21.1.jar:2.21.1]
at org.apache.camel.impl.ProducerCache$1.doInProducer(ProducerCache.java:541) ~[camel-core-2.21.1.jar:2.21.1]
at org.apache.camel.impl.ProducerCache$1.doInProducer(ProducerCache.java:506) ~[camel-core-2.21.1.jar:2.21.1]
at org.apache.camel.impl.ProducerCache.doInProducer(ProducerCache.java:369) ~[camel-core-2.21.1.jar:2.21.1]
at org.apache.camel.impl.ProducerCache.sendExchange(ProducerCache.java:506) ~[camel-core-2.21.1.jar:2.21.1]
at org.apache.camel.impl.ProducerCache.send(ProducerCache.java:264) ~[camel-core-2.21.1.jar:2.21.1]
at org.apache.camel.impl.DefaultProducerTemplate.requestBody(DefaultProducerTemplate.java:325) ~[camel-core-2.21.1.jar:2.21.1]
at com.example.admin.backend.api.Partners.create(Partners.java:16) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_152]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_152]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_152]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_152]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97) ~[spring-webmvc-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) ~[spring-webmvc-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) ~[spring-webmvc-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) ~[spring-webmvc-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967) ~[spring-webmvc-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901) ~[spring-webmvc-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) ~[spring-webmvc-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872) ~[spring-webmvc-4.3.13.RELEASE.jar:4.3.13.RELEASE]

尽管

<dependency>
  <groupId>org.apache.camel</groupId>
  <artifactId>camel-jackson-starter</artifactId>
  <version>2.21.1</version>
</dependency>

在pom.xml中执行。我的猜测是，除了简单地注册数据格式之外，我必须以某种方式告诉Camel使用它，但目前想知道究竟是怎么回事。

Answer 1

感谢@ hk6279，通过添加配置类解决了问题：

@Configuration
public class CamelContextConfig implements CamelContextConfiguration {
    @Override
    public void beforeApplicationStart(CamelContext camelContext) {

    }

    @Override
    public void afterApplicationStart(CamelContext camelContext) {
        camelContext.getGlobalOptions().put(JacksonConstants.ENABLE_TYPE_CONVERTER, "true");
        camelContext.getGlobalOptions().put(JacksonConstants.TYPE_CONVERTER_TO_POJO, "true");
    }
}

如何在spring环境中使用bean-integration时指定Apache Camel数据格式？

1 个答案: