core servlets 结束第二章

<jsp-config>
    <jsp-property-group>
<url-pattern>/WEB-INF/jspPages/ustm/*</url-pattern>
      <el-ignored>true</el-ignored>
     <include-prelude>
        /WEB-INF/jspPages/USTMHeader.jsp
      </include-prelude>
      <include-coda>
/WEB-INF/jspPages/USTMFooter.jsp
      </include-coda>
    </jsp-property-group>
  </jsp-config>

 

关于cluster

the HttpSession object gets copied and shared among the cluster.

1.    Avoid instance variables and static data (such as singletons) for
shared data.

2.    Don't store data in the ServletContext.

3.    Objects stored in HttpSession must implement Serializable.
4.    Only minimal information should be stored in HttpSession.