目录JVM中GC Root对象有哪些（一）虚拟机栈中引用的对象（二）方法区中类静态属性引用的对象（三）方法区中常量引用的对象（四）本地方法栈中引用的对象JVM 中的 GC Roots 和可达链什么是GC Root 对象?常用的GC算法G
Is it possible to listen to relation database update? For example, my web app want to send data update to client through Comet technology. I can have the program to poll the database periodically, but
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