Can I disable somehow Checkstyle warning?
Missing package-info.java file.
My IDE is IntelliJ IDEA.
If you haven't configured anything yet, and you are using IntelliJ, this means you are using the Sun checks configuration. You may not like this answer, but don't shoot the messenger ...
<module name="JavadocPackage">...</module>
from the XML.There is currently (as of Checkstyle 7.1.1) no other way to disable a rule from the standard configuration.
If you just want to suppress a single violation, or a group of violations, you may also consider the many suppression configuration options. In order to suppress one rule entirely, you would still have to change the XML, so the above method is better.