Are there any good Java blogs around?

What are some good resources for an experienced Java (EE) developer to improve his use of the language?

Effective Java is great, but are there any other consensus must-read books, blogs, etc. that would help improve one's understanding of the language? Of particular interest would be resources about scaling large (mostly) Java (distributed) systems, performance, and concurrency.
Answer:

http://www.buggybread.com/2013/09/java-online-practice-tests.html http://www.buggybread.com/2014/05/interview-questions-and-answers.html http://javarevisited.blogspot.com/ http://www.tutorialspoint.com/java/java_interview_questions.htm http://www.journaldev.com/

Vivek Vermani at Quora Visit the source

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