I finally found a working solution. My version of the Eclipse IDE:
Version: Mars.2 Release (4.5.2)
Build Code: 20160218-0600
Installation Details β Installed Software:
Buildship: Eclipse Plug-ins for Gradle 1.0.11.v20160328-1759 org.eclipse.buildship.feature.group Eclipse Buildship Eclipse IDE for Java EE Developers 4.5.2.20160218-0600 epp.package.jee null Groovy Compiler 2.4 Feature 2.9.2.xx-201603042130-e45 org.codehaus.groovy24.feature.feature.group Codehaus.org Groovy-Eclipse Feature 2.9.2.xx-201603042130-e45 org.codehaus.groovy.eclipse.feature.feature.group Codehaus.org Spring IDE Core (required) 3.7.3.201602250914-RELEASE org.springframework.ide.eclipse.feature.feature.group Spring IDE Developers
After importing the project into the workspace, add the new Spring Boot App debugging configuration:

Enjoy the debugging.
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