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A loader does not do the reloading itself, however. Instead, it calls the Context interface's reload method.

By default, in the standard implementation of Context (the org.apache.catalina.core.StandardContext class, which is discussed in Chapter 12), reloading is not enabled. Therefore, to enable reloading of a context, you need to add a Context element for that context in your server.xml file, such as the following: <Context path="/myApp" docBase="myApp" debug="0" reloadable="true"/>

If a servlet implements this interface, you are guaranteed that no two threads will execute concurrently in a servlet's service method. The servlet container can guarantee this by synchronizing access to a single instance of the servlet, or by maintaining a pool of servlet instances and dispatching each new request to a free servlet. This interface does not prevent synchronization problems that result from servlets accessing shared resources such as static class variables or classes outside the scope of the servlet.

It is true that by implementing SingleThreadModel no two threads will execute a servlet's service method at the same time. However, to enhance performance the servlet container can create multiple instances of an STM servlet. That means, the STM servlet's service method can be ...

一个功能齐全的servlet容器要做以下这些事情：

1、当第一次调用某个servlet时候要载入servlet类,并调用其init方法。

2.针对每个request 创建一个java,servlet.ServletRequest 实例，针对每个response 创建java,servlet.ServletResponse实例。

3.调用servlet的service方法将ServletRequest对象和ServletResponse对象作为参数穿进去。

4.当关闭改Servlet类时需要调用destroy，并卸载改Servlet类

5.等待http请求

6.创建一个ServletRequest对象和一个ServletResponse对象

7.诺请求的是静态资源则调用静态资源对应的方法

8如果请求的是Servlet则载入相应的Servlet类

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