org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor#generateReferenceBeanCacheKey has a bug

[zonghaishang]

• I have searched the issues of this repository and believe that this is not a duplicate.
• I have checked the FAQ of this repository and believe that this is not a duplicate.

Environment

• Dubbo version: 2.6.2+
• Operating System version: mac
• Java version: jdk8

Steps to reproduce this issue

refer: https://github.com/apache/incubator-dubbo/issues/2511， Multiple reference configurations on the same interface will be overwritten

reproduce this issue: https://github.com/freeseawind/copycat-dubbo

Expected Result

@reference does not affect each other on the same interface

[cvictory]

@zonghaishang how is it going? If you fix it, please edit the milestone to 2.6.5.

[zonghaishang]

fixed, close it now. see : #2649