Re: Created a class dynamically but could not use it to create typed objects

On May 16, 10:35 pm, Arne Vajh=F8j <a...@vajhoej.dk> wrote:


~
 OK, I think my seconds thoughts were not baseless, as tomcat showed
to me generics don't appear to depend solely on compile time checks
and/or there definitely is a way around it
~
 I think there should be a way to load and handle generic classes at
run time. Tomcat does it
~
 This is what I did to see what was going on with tc classloaders and
generic classes:
~
 1) in catalina.sh I declared: CATALINA_OPTS=-verbose:class
~
 2) in /webapps/ROOT/META-INF/context.xml I set: reloadable="true"
~
 3) then I used some test classes to play with tc loaders and see live
how it would indeed reload changed and totally new class, even generic
ones

package test.k00;
public class K00{
 public int i0;
 public long l0;
}

package test.k00;
public class K02{
 public int i2;
 public String aS2;
}

package test.k00;
import java.util.*;
// __
public class GenK00<T>{
 private String aS;
 public ArrayList<T> ALK00 = new ArrayList<T>();
// __
 public GenK00(String aS){
  this.aS = aS;
 }
}

~
 4) Inside of index.jsp I included:

           <p>
Loading Generic classes:<br/>
<%@page import="test.k00.*"%>

<%
 GenK00<String> GK0 = new GenK00<String>("<String>");
 GK0.ALK00.add("blue");
 GK0.ALK00.add("rote");
 GK0.ALK00.add("blanco");

 K00 k0 = new K00();
 k0.i0 = 0;
 k0.l0 = 0L;

 K00 k1 = new K00();
 k1.i0 = 1;
 k1.l0 = 1L;

 K00 k2 = new K00();
 k2.i0 = 2;
 k2.l0 = 2L;

 GenK00<K00> GK2 = new GenK00<K00>("K00");
 GK2.ALK00.add(k0);
 GK2.ALK00.add(k1);
 GK2.ALK00.add(k2);
 GK2.ALK00.add(k1);

 K02 J = new K02();
 J.i2 = 4748;
 J.aS2 = "aS2";
%>

<br/>
GK0.ALK00.size(): <%=GK0.ALK00.size()%>

<br/>
GK0.ALK00: <%=GK0.ALK00%>

<br/>
GK2.ALK00.size(): <%=GK2.ALK00.size()%>

<br/>
GK2.ALK00: <%=GK2.ALK00%>

<br/>
J: <%=J%>
          </p>

 So all that I needs to be done is look into tc classloaders

 Am I missing anything here?

 lbrtchx