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OpenFeign doesn't work with kotlin suspend method

See original GitHub issue

I have an API interface where the methods are kotlin suspend methods:

@FeignClient(path = "/api/masker", contextId = "MaskerApi", name = Const.SERVICE, configuration = [FeignConfig::class])
interface MaskerApi {

    @PostMapping("/mask")
    suspend fun mask(
        @Valid @RequestBody maskRequest: MaskRequest,
    ): RestResponse<List<CharSequence>>

    @PostMapping("/matches")
    suspend fun matches(
        @Valid @RequestBody maskRequest: MaskRequest,
    ): RestResponse<List<Boolean>>
}

But when I run the program, the program throws an exception:

Caused by: java.lang.IllegalStateException: Method has too many Body parameters: public abstract java.lang.Object io.github.xhstormr.masker.web.api.masker.MaskerApi.matches(io.github.xhstormr.masker.model.masker.MaskRequest,kotlin.coroutines.Continuation)
Warnings:
- 
	at feign.Util.checkState(Util.java:121) ~[feign-core-11.7.jar:na]
	at feign.Contract$BaseContract.parseAndValidateMetadata(Contract.java:142) ~[feign-core-11.7.jar:na]
	at org.springframework.cloud.openfeign.support.SpringMvcContract.parseAndValidateMetadata(SpringMvcContract.java:193) ~[spring-cloud-openfeign-core-3.1.0.jar:3.1.0]
	at feign.Contract$BaseContract.parseAndValidateMetadata(Contract.java:65) ~[feign-core-11.7.jar:na]
	at feign.ReflectiveFeign$ParseHandlersByName.apply(ReflectiveFeign.java:151) ~[feign-core-11.7.jar:na]
	at feign.ReflectiveFeign.newInstance(ReflectiveFeign.java:49) ~[feign-core-11.7.jar:na]
	at feign.Feign$Builder.target(Feign.java:268) ~[feign-core-11.7.jar:na]
	at org.springframework.cloud.openfeign.DefaultTargeter.target(DefaultTargeter.java:30) ~[spring-cloud-openfeign-core-3.1.0.jar:3.1.0]
	at org.springframework.cloud.openfeign.FeignClientFactoryBean.loadBalance(FeignClientFactoryBean.java:373) ~[spring-cloud-openfeign-core-3.1.0.jar:3.1.0]
	at org.springframework.cloud.openfeign.FeignClientFactoryBean.getTarget(FeignClientFactoryBean.java:421) ~[spring-cloud-openfeign-core-3.1.0.jar:3.1.0]
	at org.springframework.cloud.openfeign.FeignClientFactoryBean.getObject(FeignClientFactoryBean.java:396) ~[spring-cloud-openfeign-core-3.1.0.jar:3.1.0]
	at org.springframework.cloud.openfeign.FeignClientsRegistrar.lambda$registerFeignClient$0(FeignClientsRegistrar.java:235) ~[spring-cloud-openfeign-core-3.1.0.jar:3.1.0]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.obtainFromSupplier(AbstractAutowireCapableBeanFactory.java:1249) ~[spring-beans-5.3.14.jar:5.3.14]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1191) ~[spring-beans-5.3.14.jar:5.3.14]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.14.jar:5.3.14]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.14.jar:5.3.14]
	... 28 common frames omitted

This kotlin.coroutines.Continuation parameter is generated by the kotlin compiler at compile time, so I can’t modify this parameter, how can I tell FeignClient to ignore this Continuation parameter?

Issue Analytics

State:
Created 2 years ago
Comments:16 (4 by maintainers)

Top GitHub Comments

1reaction

XhstormRcommented, May 29, 2022

@tmdgusya I see what you mean. The problem with this issue is to make FeignClient annotated classes to resolve suspend method calls.

0reactions

velocommented, Jun 22, 2022

Well, not sure if I will have enough time for this

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