Some features that were available in Spring Boot 1.x but are no longer supported in Spring Boot 2.0 are as follows:

• Disabled CRaSH support—Spring Boot 1.x had an integrated Java shell that was used to SSH and Telnet in a Spring Boot application. This is no longer available and the spring-boot-starter-remote-shell dependency can no longer provide support in monitoring and manage Spring Boot applications.
• Removed auto-configuration support for Spring Mobile.
• Removed auto-configuration support for Spring Social.
• Removed dependency management support for commons-digester.