IneligibleMethodException：找到多个参数类型候选 - Spring Integration

Question

我正在使用

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-integration</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.integration</groupId>
        <artifactId>spring-integration-http</artifactId>
    </dependency>

我有这个控制器，在那里我收到了一个路径变量和请求正文

@PatchMapping("/applications/{applicationId}/disclosure")
public void piSubmission(@PathVariable(value = "applicationId") String applicationId,
                         @RequestBody DisclosureInfo disclosureInfo) {

    disclosureGateway.process(applicationId, disclosureInfo);
    
}

我使用网关初始化进程，因此我将 2 个值传递给它

@MessagingGateway
public interface DisclosureGateway {
    
    @Gateway(requestChannel = "disclosure")
    void process(String applicationId, DisclosureInfo disclosureInfo);
    
    
}

但是我得到了跟随错误

Caused by: java.lang.IllegalArgumentException: org.springframework.integration.handler.support.MessagingMethodInvokerHelper$IneligibleMethodException: Found more than one parameter type candidate: [java.lang.String] and [v3.b.engine.domain.kernel.DisclosureInfo]
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.createHandlerMethod(MessagingMethodInvokerHelper.java:396)
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.<init>(MessagingMethodInvokerHelper.java:255)
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.<init>(MessagingMethodInvokerHelper.java:206)
at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.<init>(MessagingMethodInvokerHelper.java:210)
at org.springframework.integration.handler.MethodInvokingMessageProcessor.<init>(MethodInvokingMessageProcessor.java:50)
at org.springframework.integration.transformer.MethodInvokingTransformer.<init>(MethodInvokingTransformer.java:38)
at org.springframework.integration.config.annotation.TransformerAnnotationPostProcessor.createHandler(TransformerAnnotationPostProcessor.java:71)
at org.springframework.integration.config.annotation.AbstractMethodAnnotationPostProcessor.postProcess(AbstractMethodAnnotationPostProcessor.java:158)
at org.springframework.integration.config.annotation.MessagingAnnotationPostProcessor.postProcessMethodAndRegisterEndpointIfAny(MessagingAnnotationPostProcessor.java:230)
at org.springframework.integration.config.annotation.MessagingAnnotationPostProcessor.lambda$processAnnotationTypeOnMethod$1(MessagingAnnotationPostProcessor.java:220)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
at org.springframework.integration.config.annotation.MessagingAnnotationPostProcessor.afterSingletonsInstantiated(MessagingAnnotationPostProcessor.java:141)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:963)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:923)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:588)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:767)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:326)
at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:123)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124)
... 67 more
Caused by: org.springframework.integration.handler.support.MessagingMethodInvokerHelper$IneligibleMethodException: Found more than one parameter type candidate: [java.lang.String] and [v3.b.engine.domain.kernel.DisclosureInfo]
    at org.springframework.integration.handler.support.MessagingMethodInvokerHelper$HandlerMethod.setExclusiveTargetParameterType(MessagingMethodInvokerHelper.java:1334)
    at org.springframework.integration.handler.support.MessagingMethodInvokerHelper$HandlerMethod.processMethodParameterForExpression(MessagingMethodInvokerHelper.java:1199)
    at org.springframework.integration.handler.support.MessagingMethodInvokerHelper$HandlerMethod.generateExpression(MessagingMethodInvokerHelper.java:1152)
    at org.springframework.integration.handler.support.MessagingMethodInvokerHelper$HandlerMethod.<init>(MessagingMethodInvokerHelper.java:1091)
    at org.springframework.integration.handler.support.MessagingMethodInvokerHelper.createHandlerMethod(MessagingMethodInvokerHelper.java:391)

我错过了什么？

Answer 1

请让自己更熟悉什么是 Spring Integration 中的消息传递网关：https://docs.spring.io/spring-integration/docs/current/reference/html/messaging-endpoints.html#gateway。

简而言之：网关是一个在其方法调用上发送消息的接口。

Message 是这样的：

public interface Message<T> {

    /**
     * Return the message payload.
     */
    T getPayload();

    /**
     * Return message headers for the message (never {@code null} but may be empty).
     */
    MessageHeaders getHeaders();

}

由于您没有 Message 类型作为参数之一，因此框架不知道将其中的哪一个映射到将要创建的消息的有效负载。

请确保使用@Payload 将哪个参数传递给有效负载。以及将使用@Header 注释将哪一个添加到标题中。所有这些信息都包含在我一开始链接的文档中。