Java.Servlet.If i have 2 servlets, will i have 2 instances of ServletConfig ?

If you have two servlets, the servlet container will create two separate ServletConfig instances — one for each servlet.

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🧠 Why?

Because ServletConfig is meant to hold configuration specific to one servlet, such as:

• Init parameters defined in <servlet> tag or @WebServlet
• The servlet’s name
• A reference to the shared ServletContext

Each servlet can have its own initialization settings — so it needs its own ServletConfig object.

🔧 Example

web.xml

<servlet>
  <servlet-name>LoginServlet</servlet-name>
  <servlet-class>com.app.LoginServlet</servlet-class>
  <init-param>
    <param-name>loginDb</param-name>
    <param-value>jdbc:mysql://login-db</param-value>
  </init-param>
</servlet>

<servlet>
  <servlet-name>AdminServlet</servlet-name>
  <servlet-class>com.app.AdminServlet</servlet-class>
  <init-param>
    <param-name>adminDb</param-name>
    <param-value>jdbc:mysql://admin-db</param-value>
  </init-param>
</servlet>

Servlets

public class LoginServlet extends HttpServlet {
    @Override
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        String db = config.getInitParameter("loginDb");
        System.out.println("LoginServlet using DB: " + db);
    }
}

public class AdminServlet extends HttpServlet {
    @Override
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        String db = config.getInitParameter("adminDb");
        System.out.println("AdminServlet using DB: " + db);
    }
}

✅ Each servlet gets its own ServletConfig instance, containing only its own init parameters.

🔁 What About ServletContext?

• Only one ServletContext per web application
• Shared among all servlets, filters, and listeners

✅ Summary

Concept	Scope	One per…
ServletConfig	Per servlet	✅ Yes
ServletContext	Per web app	❌ No (only one)