Spring Spring Boot 2.1 is fully supported in the IntelliJ IDEA 2018.3. Configuration values annotated with @DataSize are validated, using the default @DataSizeUnit if specified.

IntelliJ IDEA 2018.2 adds support for Java 11, which has not been released yet. “The next version of Java is due out in September, and IntelliJ IDEA 2018.2 is ready for it.