java - 尝试使用@Retryable排除异常-导致抛出ExhaustedRetryException

我试图在调用REST模板的方法上使用@Retryable。如果由于通信错误而返回错误，我想重试，否则我想在调用中抛出异常。

当发生ApiException时，而不是被@Retryable抛出并忽略，我得到了ExhaustedRetryException和提示找不到足够的“可恢复对象”(即@Recover方法)。

我以为我会发现，仅提供可恢复的方法是否会使它高兴并仍然按预期执行。没那么多。它没有引发异常，而是调用了restoreable方法。

@Retryable(exclude = ApiException include = ConnectionException, maxAttempts = 5, backoff = @Backoff(multiplier = 2.5d, maxDelay = 1000000L, delay = 150000L))
Object call(String domainUri, ParameterizedTypeReference type, Optional<?> domain = Optional.empty(), HttpMethod httpMethod = HttpMethod.POST) throws RestClientException {

    RequestEntity request = apiRequestFactory.createRequest(domainUri, domain, httpMethod)
    log.info "************************** Request Entity **************************"
    log.info "${request.toString()}"
    ResponseEntity response

    try {

        response = restTemplate.exchange(request, type)
        log.info "************************** Response Entity **************************"
        log.info "${response.toString()}"

    } catch (HttpStatusCodeException | HttpMessageNotWritableException httpException) {

        String errorMessage
        String exceptionClass = httpException.class.name.concat("-")
        if(httpException instanceof HttpStatusCodeException) {

            log.info "************************** API Error **************************"
            log.error("API responded with errors: ${httpException.responseBodyAsString}")
            ApiError apiError = buildErrorResponse(httpException.responseBodyAsString)
            errorMessage = extractErrorMessage(apiError)

            if(isHttpCommunicationError(httpException.getStatusCode().value())) {
                throw new ConnectionException(exceptionClass.concat(errorMessage))
            }
        }

        errorMessage = StringUtils.isBlank(errorMessage) ? exceptionClass.concat(httpException.message) : exceptionClass.concat(errorMessage)
        throw new ApiException(httpMethod, domainUri, errorMessage)

    }

    if (type.type == ResponseEntity) {
        response
    }
    else response.body

}

@Recover
Object connectionException(ConnectionException connEx) {
    log.error("Retry failure - communicaiton error")
    throw new ConnectionException(connEx.class.name + " - " + connEx.message)
}

任何见解将不胜感激。是错误还是运算符(operator)错误？
这使用的是Spring Boot 1.3.6和Spring-Retry 1.1.3。

最佳答案

您的include/exclude语法看起来很糟糕-甚至无法编译。

我只是编写了一个快速测试，如果您的@Recover方法为零，则它可以按预期工作...

package com.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.retry.annotation.EnableRetry;
import org.springframework.retry.annotation.Retryable;

@SpringBootApplication
@EnableRetry
public class So38601998Application {

    public static void main(String[] args) {
        ConfigurableApplicationContext context = SpringApplication.run(So38601998Application.class, args);
        Foo bean = context.getBean(Foo.class);
        try {
            bean.out("foo");
        }
        catch (Exception e) {
            System.out.println(e);
        }
        try {
            bean.out("bar");
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }


    @Bean
    public Foo foo() {
        return new Foo();
    }

    public static class Foo {

        @Retryable(include = IllegalArgumentException.class, exclude = IllegalStateException.class,
                maxAttempts = 5)
        public void out(String foo) {
            System.out.println(foo);
            if (foo.equals("foo")) {
                throw new IllegalArgumentException();
            }
            else {
                throw new IllegalStateException();
            }
        }

    }

}

结果:

foo
foo
foo
foo
foo
java.lang.IllegalArgumentException
bar
java.lang.IllegalStateException

如果你只是添加

@Recover
public void connectionException(IllegalArgumentException e) {
    System.out.println("Retry failure");
}

你得到

foo
foo
foo
foo
foo
Retry failure
bar
org.springframework.retry.ExhaustedRetryException: Cannot locate recovery method; nested exception is java.lang.IllegalStateException

因此，您需要一个包罗万象的@Recover方法...

@Recover
public void connectionException(Exception e) throws Exception {
    System.out.println("Retry failure");
    throw e;
}

结果:

foo
foo
foo
foo
foo
Retry failure
bar
Retry failure
java.lang.IllegalStateException