Issue: SPR-17104

Issue: SPR-17032

This revision considers any java/javax and org.springframework.lang annotations as not synthesizable upfront, checking not only in isSynthesizable but also at synthesizeAnnotation(Array) level.

Issue: SPR-16933

Issue: SPR-17074

Includes revision of web.servlet.tags.form for non-null conventions.

Issue: SPR-15540

Empty Maps are preferably initialized without capacity (not initializing them at all or lazily initializing with default capacity when needed).

Issue: SPR-17105

Issue: SPR-16993

Obvious Fix

Issue: SPR-17090

Issue: SPR-16993

Issue: SPR-17091

Based on discussion under
https://github.com/spring-projects/spring-framework/pull/1901

Issue: SPR-17096

Issue: SPR-17094

Fix the error message when PropertySources are not applied

Issue: SPR-17095

Issue: SPR-17093

'AbstractFactoryBean#getEarlySingletonInstance' documentation mentions "eager singleton". I'm quite sure it should be fixed to "early singleton".

Issue: SPR-15338

Sample output at TRACE:
```
DispatcherServlet - Initializing Servlet 'org.springframework.web.servlet.DispatcherServlet-7a8c8dcf'
AnnotationConfigWebApplicationContext - Refreshing WebApplicationContext for namespace 'org.springframework.web.servlet.DispatcherServlet-7a8c8dcf-servlet', started on Wed Jul 25 17:46:38 EDT 2018
AnnotationConfigWebApplicationContext - Registering [org.springframework.web.servlet.mvc.method.annotation.RequestPartIntegrationTests$CommonsMultipartResolverTestConfig]
AnnotationConfigWebApplicationContext - No 'messageSource' bean, using [Empty MessageSource]
AnnotationConfigWebApplicationContext - No 'applicationEventMulticaster' bean, using [SimpleApplicationEventMulticaster]
AnnotationConfigWebApplicationContext - No 'lifecycleProcessor' bean, using [DefaultLifecycleProcessor]
...
DispatcherServlet - Initialization completed in 3361 ms
```

Issue: SPR-16946

Includes related polishing in the advice interceptor implementations.

Issue: SPR-17088

Includes nullability declarations for the protobuf package.

Issue: SPR-15776

Issue: SPR-17086

Issue: SPR-16585
Issue: SPR-17012