Until the fix for JDK-8209506 [1] is available in Java 11 builds,
SSL connections to services using Google's SSL certificate do not work
due to a lack of trust. This affects both our OAuth2 client samples
which were using https://accounts.google.com as an OpenID Connect
provider.
This commit switches the two samples to use Yahoo in place of Google.
See gh-14028
[1] https://bugs.openjdk.java.net/browse/JDK-8209506
Unlike Java 8, 9, and 10, Java 11 does not tolerate a null URL being
used to create a URLClassLoader. The Atmosphere sample looks for
a resource named /WEB-INF/classes which only exists in a packaged
war application. In all other cases the resulting URL is null.
Atmosphere uses this to create a URLClassLoader which fails on Java
11.
This commit updates the sample to customize the handlers path. There
are other web application-specific assumptions in Atmosphere, such as
the scanning of WEB-INF/lib by default. This change appears to get
the sample going, but we should, perhaps, consider removing it in the
longer term, particularly as Boot itself has no Atmosphere
integration.
See gh-14028
Update `TomcatResources` so that `META-INF/resources` folders in
`src/main/resources` no longer fail with a "URI is not hierarchical"
exception.
Closes gh-13265
Use `spring-javaformat` to format and check code. Code formatting can
now be applied using the `spring-javaformat-maven-plugin` from the
command line. Existing checkstyle rules have also been replaced and
the CONTRIBUTING.adoc file has been updated.
Closes gh-13255
Andy Wilkinson
Johnny Lim
Stephane Nicoll
Madhura Bhave
Spring Buildmaster
Phillip Webb
Vedran Pavic