jvm相关

参考：http://blog.chinaunix.net/uid-29632145-id-4697079.html

    http://www.cnblogs.com/redcreen/archive/2011/05/04/2037057.html

    http://www.importnew.com/14086.html

        http://lxy2330.iteye.com/blog/1101597

    http://www.cnblogs.com/redcreen/archive/2011/05/09/2040977.html