如何修复应用程序启动期间SAP Cloud SDK抛出的目标accessexception

Question

我想用Spring应用程序扩展S/4HANA云系统。可以在没有任何错误的情况下构建应用程序，也可以将其部署到SAP云平台。当后端应用程序启动时，它会引发错误。日志中的错误如下：

[.../WEB-INF/classes/com/sap/controllers/ExportController.class]: Unsatisfied dependency expressed through constructor parameter 0; 
nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'exportServiceImpl' defined in file [.../WEB-INF/classes/com/sap/services/ExportServiceImpl.class]: Unsatisfied dependency expressed through constructor parameter 0;
nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'adsService' defined in class path resource [com/sap/ads/service/ServiceConfiguration.class]: Bean instantiation via factory method failed;
nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.sap.ads.service.Service]: Factory method 'service' threw exception;
nested exception is com.sap.cloud.sdk.cloudplatform.connectivity.exception.DestinationAccessException: Failed to get ConnectivityConfiguration: no RequestContext available. Have you correctly configured a RequestContextServletFilter or have you wrapped your logic in a RequestContextExecutor when executing background tasks that are not triggered by a request?

之后，似乎在 serviceconfiguration.class 的 destinationAccessException 中发生错误。

我已经检查了一下，并包括了以下内容：创建ERPCONFIGCONTEXT投掷异常

不幸的是，错误仍然相同。

这是受影响部件的实现：

service.class ：

[...]
public interface Service {
    [...]
    public static final String DESTINATION_NAME = "myDestination";
    @RequestLine("POST /example/path")
    Response doSomething(Request myRequest);
}

serviceconfiguration.class ：

[...]
@Configuration
public class ServiceConfiguration {
    @Bean
    public Service service() {
        return Feign.builder()
                .encoder(new JacksonEncoder())
                .decoder(new JacksonDecoder())
                .client(DestinationHelper.getHttpClient(Service.DESTINATION_NAME))
            .target(Service.class, DestinationHelper.getUrl(service.DESTINATION_NAME));
    }
}

destinationHelper.class ：

[...]
public class DestinationHelper {
    /**
     * @return the URL of the destination with {@code destinationName}
     */
    public static String getUrl(String destinationName) {
        return DestinationAccessor
                .getDestination(destinationName)
                .getUri()
                .toString();
    }
    /**
     * @return an HTTP client preconfigured for the destination
     */
    public static ApacheHttpClient getHttpClient(final String destinationName) {
        return new ApacheHttpClient(HttpClientAccessor.getHttpClient(destinationName));
    }
}

服务实施中是否存在错误的实施甚至缺失？遵循错误日志，似乎该服务实际上无法建立与目的地的正确连接。

Answer 1

这里的问题是，在应用程序启动期间，尚无RequestContext。

应解决的问题是在RequestContextExecutor中包装您的相关代码，如下所示：

@Bean
public Service service() throws Exception {
    return new RequestContextExecutor().execute(() -> {
        return Feign.builder()
            .encoder(new JacksonEncoder())
            .decoder(new JacksonDecoder())
            .client(DestinationHelper.getHttpClient(Service.DESTINATION_NAME))
        .target(Service.class, DestinationHelper.getUrl(service.DESTINATION_NAME));
    };
}