What’s New in Spring Cloud Greenwich? Upgrade Guide and Key Features

Spring Cloud Greenwich.RELEASE Overview

On 2019‑01‑23 the Spring Cloud Greenwich release was officially launched. It requires Spring Boot 2.1.x; projects still on 2.0.x should stay on the Finchley version.

POM Coordinates for Java 11 Compatibility

<!-- Support Spring Boot 2.1.X -->
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-dependencies</artifactId>
  <version>2.1.2.RELEASE</version>
  <type>pom</type>
  <scope>import</scope>
</dependency>

<!-- Greenwich.RELEASE -->
<dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-dependencies</artifactId>
  <version>Greenwich.RELEASE</version>
  <type>pom</type>
  <scope>import</scope>
</dependency>

Upgraded Netflix Components – DiscoveryClient Supports InstanceId

The new version adds support for retrieving the InstanceId via DiscoveryClient.

Spring Cloud Config New Storage Backend

Beyond Git, File, and JDBC, the release introduces CredHub support for Cloud Foundry.

spring:
  profiles:
    active: credhub
  cloud:
    config:
      server:
        credhub:
          url: https://credhub:8844

Spring Cloud Gateway Enhancements

OAuth2 Integration

An example configuration for integrating Spring Cloud Gateway with Spring Security OAuth2 is provided. A known issue (ReactiveManagementWebSecurityAutoConfiguration) may require a specific workaround.

Response Header Rewrite Filter

spring:
  cloud:
    gateway:
      routes:
        - id: rewriteresponseheader_route
          uri: http://example.org
          filters:
            - RewriteResponseHeader=X-Response-Foo,, password=[^&]+, password=***

Feign New Features and Pitfalls

@SpringQueryMap Enhances GET Requests

The @SpringQueryMap annotation improves handling of query parameters for GET requests, but it lacks a value attribute, making it incompatible with the original OpenFeign @QueryMap.

Exception Resolution

***************************
APPLICATION FAILED TO START
***************************
Description:
The bean 'pigx-upms-biz.FeignClientSpecification' ... could not be registered. A bean with that name already exists and overriding is disabled.
Action:
Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding=true

Two practical solutions:

Set spring.main.allow-bean-definition-overriding=true in bootstrap.yml (available since Spring Boot 2.1).

Consolidate calls to the same service within a single @FeignClient and use the new contextId attribute to differentiate interfaces.

spring.main.allow-bean-definition-overriding=true

This will be used as the bean name instead of name if present, but will not be used as a service id.

Summary

Spring Cloud Finchley → Greenwich changes are minimal, mainly Java 11 compatibility.

Spring Cloud Alibaba still lacks official support.

Spring Cloud LoadBalancer remains unchanged and cannot yet replace Ribbon.

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