JAVA official website diagnosis and tuning documentation

Diagnostic tools:

　　http://docs.oracle.com/javase/8/docs/technotes/guides/troubleshoot/

Tuning parameters

　　http://docs.oracle.com/javase/8/docs/technotes/guides/vm/gctuning/

jvm

        http://docs.oracle.com/javase/8/docs/technotes/guides/vm/index.html

        http://docs.oracle.com/javase/8/docs/technotes/tools/unix/java.html