JAVA 官网诊断及调优文档

诊断工具：

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

调优参数

　　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