In this appendix we discuss what users will want to know when upgrading to Spring Framework 3.1. For a general overview of features, please see Chapter 3, New Features and Enhancements in Spring 3.1
Spring Framework 3.1 introduces a number of @Configuration
classes such as org.springframework.cache.annotation.ProxyCachingConfiguration
and
org.springframework.scheduling.annotation.ProxyAsyncConfiguration.
Because @Configuration is ultimately meta-annotated with Spring's
@Component annotation, these classes will inadvertently be scanned
and processed by the container for any component-scanning directive against the
unqualified "org" package, e.g.:
<context:component-scan base-package="org"/>Therefore, in order to avoid errors like the one reported in SPR-9843, any such directives should be updated to at least one more level of qualification e.g.:
<context:component-scan base-package="org.xyz"/>
Alternatively, an exclude-filter may be used. See
context:component-scan
documentation for details.