Finally application only authentication has come. Many thanks to @komiya_atsushi!

Application only authentication is an OAuth 2.0 based technique to make API calls without getting users’ permission. To enable application only authentication, you need to explicitly set enableApplicationOnlyAuth=true in your twitter4j.properties.

For more information, check dev.twitter.com and the test case.
– Application-only authentication | Twitter Developers
– twitter4j/twitter4j-core/src/test/java/twitter4j/auth/ApplicationOnlyAuthTest.java at master · yusuke/twitter4j · GitHub

Application-only authentication is currently available only with the latest snapshot build.

Still want to celebrate #Twitter4J6thAnniversary? Please consider making donation.
– Celebrating​ #Twitter4J6thAnniversary | Twitter4J blog

Thanks, and happy tweeting!
Yusuke