This change moves a dynamic list of classes passed to
`SpringApplicationBuilder.sources` to a `DeferredImportSelector` loaded
by a simple `@Configuration` class. `BootstrapImportSelector` now loads
the classes and orders them and returns the class names so that
`@Conditional` annotations (such as `@ConditionalOnClass`) function
properly.
This was exposed while using java 11.
fixes gh-438
Due to the fact that some users have problem with setting up Spring Cloud application, we've decided
to add a compatibility verification mechanism. It will break if your current setup is not compatible
with Spring Cloud requirements, together with a report, showing what exactly went wrong.
At the moment we verify which version of Spring Boot is added to your classpath.
Example of a report
```
***************************
APPLICATION FAILED TO START
***************************
Description:
Your project setup is incompatible with our requirements due to following reasons:
- Spring Boot [1.5.16.RELEASE] is not compatible with this Spring Cloud release train
Action:
Consider applying the following actions:
- Change Spring Boot version to one of the following versions [1.2.x, 1.3.x] .
You can find the latest Spring Boot versions here [https://spring.io/projects/spring-boot#learn].
If you want to learn more about the Spring Cloud Release train compatibility, you can visit this page [https://spring.io/projects/spring-cloud#overview] and check the [Release Trains] section.
```
In order to disable this feature, set `spring.cloud.compatibility-verifier.enabled` to `false`.
If you want to override the compatible Spring Boot versions, just set the
`spring.cloud.compatibility-verifier.compatible-boot-versions` property with a comma separated list
of compatible Spring Boot versions.
fixes gh-442
* Added the service instance id to the `ServiceInstance` interface
* Updated `toString()`, `equals()` and `hashCode()`
* Updated Javadoc to fix warnings
