Servlet problems TOMCAT months in a Web application, and want to TOMCAT loaded in the application, automatically loading a servlet, and the operation of certain way (for variable initialized to the whole, such as the database connection pool removed the data source object and preservation), it should be how do? Servlet problems Put an object inside a structure, the sound of static objects. Public class commonvalue{ String aa; String bb; Private static commonvalue commonvalue instance = new (); Boolean inited; Static commonvalue getinstance () ( If (flag) ( Return instance; }else{ Commonvalue instance = new (); 4003rd initialization of variables. 4003rd return Return instance;        }     }         /** *return          */ Public String getAa () ( Return aa;         }         /** *return          */ Public String getBb () ( Return bb;         }         /** *param String          */ Public void setAa (String string) ( Aa = string;         }         /** *param String          */ Public void setBb (String string) ( Bb = string;         } } Then getinstance () below. This is required? Servlet problems Thank you. The question is how will be able to use its Web application loaded automatically loaded? Servlet problems Init Servlet problems This is the first visit when loading If you want to start service in the loading web.xml Lane should have a label to handle. For example, the tomcat conf\\web.xml Lane [code] "Servlet>; "Servlet-name>;invoker</servlet-name>; "Servlet-class>; Org.apache.catalina.servlets.InvokerServlet "/servlet-class>; "Init-param>; "Param-name>;debug</param-name>; "Param-value>;0</param-value>; "/init-param>; "Load-on-startup>;2</load-on-startup>; "/servlet>; [/code] Load-on-startup designated start is the type of loading. Servlet problems Try first, I would like to thank first Servlet problems In web.xml configuration file "Servlet>; "Servlet-name>;Sname</servlet-name>;                 "Servlet-class>;test.Sname</servlet-class>; "Load-on-startup>;1</load-on-startup>;                 "/servlet>; Servlet problems OK, 3x [ Closed window ]