Here is my short list, a compilation of links from the article https://www.sitepoint.com/10-java-blogs-follow-2017/ by Thorben Jansen. However, due to my preferences I only include links that might be of interest to me personally.
| Focus | Author(s) | Link |
|---|---|---|
| JPA, Hibernate | Thorben Jansen | http://www.thoughts-on-java.org/ |
| Concurrency | Heinz Kabutz | http://www.javaspecialists.eu/archive/archive.jsp |
| Java, Spring, REST | Eugen Baeldung | http://www.baeldung.com/ |
| JBDC, SQL, JPA, jOOQ | Lukas Eder | https://blog.jooq.org/ |
| Java, Java EE | Adam Bien | http://adambien.blog/roller/abien/ |
| New Java Stuff | Takipi Team | http://blog.takipi.com/ |
| Tests | Petri Kainulainen | https://www.petrikainulainen.net/blog/ |
| Java9, JUnit5 | Nicolai Parlog | http://blog.codefx.org/ |