about the constructor of a Servlet class

[Bo Xu]

Hi dear friends,

I have a question about the constructor of a Servlet class(its name is
myServlet.class):
   * I find if I write a constructor:
           - public myServlet(){...}
           - public myServlet(int i){...}
           - myServlet(){...}
           - myServlet(int i){...}

      I can complier myServlet.java, but when I run it, it seems that only
      the following can work:
          - public myServlet(){...}
      it seems that others can not work.

   * so:
       - I guess perhaps Servlet container uses something like the following:
         ...
         URL [] urls=new URL[]{new URL("file:ServletPath/")};}
         ClassLoader cl=new URLClassLoader(urls);
         Class c=cl.loadClass("myServlet");
         myServlet sServlet=(myServlet)c.newInstance();
         ...
       - when I test the above code in a Java Application(and use another
          simple Java class mySimple.class to replace myServlet.class), I got
          the same result:
          I only can write "public mySimple(){...}", otherwise I wil get:
             - "java.lang.InstantiationException: mySimple"  for the following
constructor:
                public mySimple(int i){...}
                or
                mySimple(int i){...}
             - "java.lang.IllegalAccessException: mySimple"  for the following
constructor:
                mySimple(){...}

     *  so could anybody tell me:
             does Servlet container use the above way to make a instance for my

             Servlet class? because I want to know how to keep a object
refrenced by
             a field in my Servlet class in JVM as long as possible.


Thanks in advance!  Happy new year!:-)

Bo
Dec.31, 2000

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