* pr/7916:
  Polish contribution
  Polish samples list in readme

Closes gh-7916

See gh-7916

Closes gh-7923

Closes gh-7923

Previously, if a failure analyzer threw an exception from its
analyze method, failure analysis would stop.

This commit updates FailureAnalyzers to catch and log any Throwable
thrown by an analyzer and continue to the next available analyzer.

Closes gh-7956

Previously, ErrorPageFilter set the value of
javax.servlet.error.exception_type to be the name of the exception,
(a java.lang.String). This commit changes it to be a java.lang.Class
as required by the Servlet spec.

Closes gh-7925

Closes gh-7984

Previously, OAuth2MethodSecurityConfiguration set the
PermissionEvaluator on the expression evaluator by looking in the
context for a PermissionEvaluator bean. This is unnecessary as
GlobalMethodSecurityConfiguration already does the same thing and does
so after the post-processor in OAuth2MethodSecurityConfiguration has
run. This commit removes the redundant logic and adds tests to check
that both the PermissionEvaluator and the RoleHierarchy are set use
beans in the context.

Closes gh-7979

Closes gh-7859

Closes gh-7768

Closes gh-7864

See gh-7962

Closes gh-7964

Closes gh-7943

* pr/7911:
  Fix configure a datasource reference doc link