Apollo v1.9.2 release

Enhancements

• Update xstream version to 1.4.18 #4177

Bug fixes

• Fix the issue that property placeholder doesn't work for dubbo reference beans #4161 #4169
• Fix the NPE occurred when using EnableApolloConfig with Spring 3.1.1 #4179
• Catch LinkageError for ClassLoaderUtil.isClassPresent in case class is present but is failed to load #4187

Credits

@lonre @nobodyiam

Installation

Please refer Distributed Deployment Guide

How to upgrade from v1.9.1 to v1.9.2

There is no schema change between v1.9.1 and v1.9.2
So simply deploy v1.9.2 executables with the following sequences:

1. apollo-configservice
2. apollo-adminservice
3. apollo-portal