Fix links to `actuator-noweb`, `actuator-log4j` and `hornetq` samples.

Fixes gh-1613

Update RelaxedConversionService to also support String to char[]
conversion. Primarily to support the `password` field in
MongoProperties.

Fixes gh-1572

Update ConfigFileApplicationListener to include more debug level output.
Debug messages are recorded during onApplicationEnvironmentPreparedEvent
but not actually output until onApplicationPreparedEvent. This is
because the logging level might not have been correctly set until the
context is completely prepared.

Fixes gh-1584

Previously, only the state of the primary connector was checked when
verifying that the embedded Tomcat instance has started successfully.
This commit updates the verification logic to examine all of the
service's connectors, thereby also detecting startup failures of any
additional connectors the have been configured.

A check on the primary connector's state has been removed from
initialize as, at this stage, its state will always be NEW.

Fixes gh-1591

See gh-1599

Closes gh-1596

Some frameworks handle all requests in a Filter, so you have to
explicitly register it as an ERROR dispatcher.

See gh-1272

Done in order to align with the rest of the configuration. Absent this
check, the bean will be installed in non-web applications without the
corresponding dependencies, causing the bootstrap to fail.

Closes gh-1588

Corrected the documentation to refer to file as tests.groovy, rather
than test.groovy. Updated cope snippet as tests.groovy should expect
"Hello World!" rather than "Hello World".

Closes gh-1593

... or couldn't hurt anyway.

1. Extends the definition of a web application for @ConditionalOnWebapp
so that a StandardEnvironment can be used (cutting out JNDI failures
for Environment properties)

2. Doesn't bother using StandardServletEnvironment in integration tests

3. Make the NON_ENUMERABLE_ENUMERABLES in PropertySourcesPropertyValues
static so they only get initialized once (not a huge issue at all)

Use File.separator rather than hard-coding the use of ‘/‘

Closes gh-1571

Update `LogbackLoggingSystem` to call the `reset()` method on the
`LoggerContext` before initialization.

This will hopefully reset the context to prevent the same appenders
from being accidentally added more than once.

Fixes gh-1091

This is a continuation of the changes made in 611f9781. It makes some
more @Bean methods public and adds tests to spring-boot-actuator and
spring-boot-autoconfigure to prevent against non-public methods being
introduced in the future

Closes gh-1571

Fixes gh-1571

Fixes gh-1570
Cherry-picked from 0960908b and 258c6f11

Fixes gh-1548 again

Previously, EnableAutoConfigurationImportSelector assumed that it
would always find auto-configuration attributes from an
@EnableAutoConfiguration annotation. This assumption does not hold
true in certain circumstances, although exactly what those
circumstances are is unclear. It could occur if the import selector
were used directly, but it's package-private making that unlikey. In
such circumstances a NullPointerException was being thrown.

This commit asserts that the attributes are non-null and, should the
assertion fail, produces an error that is more helpful than an NPE.

Closes gh-1512

Closes gh-1522

Closes gh-1540

The fix for gh-1475 introduced the use of an artifact's group to
discriminate between two libraries with the same name (artifact id)
and version. However, in the case of Gradle, a group name was not
provided for libraries that have been resolved from a repository.

This commit updates ResolvedArtifactLibrary to use the group obtained
from the underlying ResolvedArtifact as its discriminator.

Fixes gh-1543

User can set those properties (optionally) to use a different
DataSource than the default.

Fixes gh-1558

When MVC path matchers are used as metric keys, they can still contain
invalid characters and patterns (like asterisks). This change removes
some more special characters and also tidies up the names a bit so
no key part starts or ends with "-" (which is ugly).

Fixes gh-1528

Protecting /error doesn't make a great deal of sense and if it is
protected you don't get the ErrorPageFilter for the attempt at loading
it, so Tomcat renders its own HTML error page (when deployed as WAR).

Fixes gh-1548

Fixes gh-1534

There was too much state really in the old implementation of
AuthenticationManagerConfiguration, and it was leading occasionally
to null pointers when method A assumed that method B had already
been called and it hadn't. This change manages to concentrate all the
references to an AuthenticationManagerBuilder into a single method
call, removoing the need for storing it at all.

Fixes gh-1556

The applicationDefaultJvmArgs property was added in Gradle 1.7. This
commit updates RunPluginFeatures to access the property defensively
so that the plugin can be used with Gradle 1.6.

Fixes gh-1511

Closes gh-1503
Closes gh-1505

Closes gh-1524

Closes gh-1510