[jboss-user] [Tomcat, HTTPD, Servlets & JSP] - exception thrown: passing an object from a bean to a JSP

congrio7 do-not-reply at jboss.com
Sat Nov 25 15:11:44 EST 2006

I have a class on /lib, here is:

package auxiliar;

public class Tabla {
public String oid;
public String ip;
public int frecuencia;
public int inicio;
public int fin;

public Tabla (String oid, String ip, int frecuencia, int inicio, int fin) {
this.oid = oid;
this.ip = ip;
this.frecuencia = frecuencia;
this.inicio = inicio;
this.fin = fin;

And then I have a bean like about this:

public class VerOid {

public ArrayList ver () {

ArrayList salida = new Arraylist();
while( rs.next() ) {
salida.add(new Tabla(_oid, _ip, _frecuencia, _inicio, _fin));

And at last, I have a JSP like this:

<jsp:useBean id="id1" scope="session" class="bean.VerOid"/>


ArrayList d = id1.ver();

out.println( d.size());


out.println( ( (Tabla) (d.get(0)) ).oid );

ArrayList ff = new ArrayList();
ff.add(new Tabla ("1.1.","127.",3,4,5));

out.println( ( (Tabla) ff.get(0) ).frecuencia );


d.size no problem
With ff neither.

But out.println( ( (Tabla) (d.get(0)) ).oid ); thrown an exception java.lang.ClassCastException and I don't know why.

I have JDK 1.4.

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