Eccoti il file .java e il file .html dove viene richiamto l'applet.
Il file .html è una prova: in quello che uso, al posto dei valori stabiliti ci sono valori provenienti da un recordset.
Il problema però si verifica anche con questo file.

QUESTO E' IL FILE GRAPHER.JAVA

package Graficatore;

import javax.swing.JLabel;

public class Grapher extends javax.swing.JApplet {

private JLabel[] verde1;
private JLabel[] azzurro2;
private JLabel[] blu3;
private JLabel[] rosso4;

public void init() {
initComponents();
int numV = Integer.parseInt(getParameter("fa1"));
int numA = Integer.parseInt(getParameter("fa2"));
int numB = Integer.parseInt(getParameter("fa3"));
int numR = Integer.parseInt(getParameter("fa4"));
verde1 = new JLabel[] { jLabel2, jLabel3, jLabel5, jLabel4, jLabel6,
jLabel7, jLabel11, jLabel10, jLabel8, jLabel9 };
azzurro2 = new JLabel[] { jLabel12, jLabel13, jLabel15, jLabel14,
jLabel16, jLabel17, jLabel21, jLabel20,
jLabel18, jLabel19 };
blu3 = new JLabel[] { jLabel22, jLabel23, jLabel25, jLabel24, jLabel26,
jLabel27, jLabel31, jLabel30, jLabel28, jLabel29 };
rosso4 = new JLabel[] { jLabel32, jLabel33, jLabel35, jLabel34, jLabel36,
jLabel37, jLabel41, jLabel40, jLabel38, jLabel39 };
for (int i = 0; i < 10; i++) {
if (i >= numV)
verde1[i].setVisible(false);
if (i >= numA)
azzurro2[i].setVisible(false);
if (i >= numB)
blu3[i].setVisible(false);
if (i >= numR)
rosso4[i].setVisible(false);
}
}

private void initComponents() {//GEN-BEGIN:initComponents
jPanel1 = new javax.swing.JPanel();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jLabel5 = new javax.swing.JLabel();
jLabel6 = new javax.swing.JLabel();
jLabel7 = new javax.swing.JLabel();
jLabel8 = new javax.swing.JLabel();
jLabel9 = new javax.swing.JLabel();
jLabel10 = new javax.swing.JLabel();
jLabel11 = new javax.swing.JLabel();
jLabel12 = new javax.swing.JLabel();
jLabel13 = new javax.swing.JLabel();
jLabel14 = new javax.swing.JLabel();
jLabel15 = new javax.swing.JLabel();
jLabel16 = new javax.swing.JLabel();
jLabel17 = new javax.swing.JLabel();
jLabel18 = new javax.swing.JLabel();
jLabel19 = new javax.swing.JLabel();
jLabel20 = new javax.swing.JLabel();
jLabel21 = new javax.swing.JLabel();
jLabel22 = new javax.swing.JLabel();
jLabel23 = new javax.swing.JLabel();
jLabel24 = new javax.swing.JLabel();
jLabel25 = new javax.swing.JLabel();
jLabel26 = new javax.swing.JLabel();
jLabel27 = new javax.swing.JLabel();
jLabel28 = new javax.swing.JLabel();
jLabel29 = new javax.swing.JLabel();
jLabel30 = new javax.swing.JLabel();
jLabel31 = new javax.swing.JLabel();
jLabel32 = new javax.swing.JLabel();
jLabel33 = new javax.swing.JLabel();
jLabel34 = new javax.swing.JLabel();
jLabel35 = new javax.swing.JLabel();
jLabel36 = new javax.swing.JLabel();
jLabel37 = new javax.swing.JLabel();
jLabel38 = new javax.swing.JLabel();
jLabel39 = new javax.swing.JLabel();
jLabel40 = new javax.swing.JLabel();
jLabel41 = new javax.swing.JLabel();

jPanel1.setLayout(null);

jPanel1.setBackground(new java.awt.Color(248, 253, 181));
jLabel1.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/Blank.png")));
jPanel1.add(jLabel1);
jLabel1.setBounds(10, 10, 250, 220);

jLabel2.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaVerde.png")));
jPanel1.add(jLabel2);
jLabel2.setBounds(38, 180, 36, 14);

jLabel3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaVerde.png")));
jPanel1.add(jLabel3);
jLabel3.setBounds(38, 166, 36, 14);

jLabel4.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaVerde.png")));
jPanel1.add(jLabel4);
jLabel4.setBounds(38, 138, 36, 14);

jLabel5.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaVerde.png")));
jPanel1.add(jLabel5);
jLabel5.setBounds(38, 152, 36, 14);

jLabel6.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaVerde.png")));
jPanel1.add(jLabel6);
jLabel6.setBounds(38, 124, 36, 14);

jLabel7.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaVerde.png")));
jPanel1.add(jLabel7);
jLabel7.setBounds(38, 110, 36, 14);

jLabel8.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaVerde.png")));
jPanel1.add(jLabel8);
jLabel8.setBounds(38, 68, 36, 14);

jLabel9.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaVerde.png")));
jPanel1.add(jLabel9);
jLabel9.setBounds(38, 54, 36, 14);

jLabel10.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaVerde.png")));
jPanel1.add(jLabel10);
jLabel10.setBounds(38, 82, 36, 14);

jLabel11.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaVerde.png")));
jPanel1.add(jLabel11);
jLabel11.setBounds(38, 96, 36, 14);

jLabel12.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaAzzurro.png")));
jPanel1.add(jLabel12);
jLabel12.setBounds(77, 180, 36, 14);

jLabel13.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaAzzurro.png")));
jPanel1.add(jLabel13);
jLabel13.setBounds(77, 166, 36, 14);

jLabel14.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaAzzurro.png")));
jPanel1.add(jLabel14);
jLabel14.setBounds(77, 138, 36, 14);

jLabel15.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaAzzurro.png")));
jPanel1.add(jLabel15);
jLabel15.setBounds(77, 152, 36, 14);

jLabel16.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaAzzurro.png")));
jPanel1.add(jLabel16);
jLabel16.setBounds(77, 124, 36, 14);

jLabel17.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaAzzurro.png")));
jPanel1.add(jLabel17);
jLabel17.setBounds(77, 110, 36, 14);

jLabel18.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaAzzurro.png")));
jPanel1.add(jLabel18);
jLabel18.setBounds(77, 68, 36, 14);

jLabel19.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaAzzurro.png")));
jPanel1.add(jLabel19);
jLabel19.setBounds(77, 54, 36, 14);

jLabel20.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaAzzurro.png")));
jPanel1.add(jLabel20);
jLabel20.setBounds(77, 82, 36, 14);

jLabel21.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaAzzurro.png")));
jPanel1.add(jLabel21);
jLabel21.setBounds(77, 96, 36, 14);

jLabel22.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaBlu.png")));
jPanel1.add(jLabel22);
jLabel22.setBounds(116, 180, 36, 14);

jLabel23.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaBlu.png")));
jPanel1.add(jLabel23);
jLabel23.setBounds(116, 166, 36, 14);

jLabel24.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaBlu.png")));
jPanel1.add(jLabel24);
jLabel24.setBounds(116, 138, 36, 14);

jLabel25.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaBlu.png")));
jPanel1.add(jLabel25);
jLabel25.setBounds(116, 152, 36, 14);

jLabel26.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaBlu.png")));
jPanel1.add(jLabel26);
jLabel26.setBounds(116, 124, 36, 14);

jLabel27.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaBlu.png")));
jPanel1.add(jLabel27);
jLabel27.setBounds(116, 110, 36, 14);

jLabel28.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaBlu.png")));
jPanel1.add(jLabel28);
jLabel28.setBounds(116, 68, 36, 14);

jLabel29.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaBlu.png")));
jPanel1.add(jLabel29);
jLabel29.setBounds(116, 54, 36, 14);

jLabel30.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaBlu.png")));
jPanel1.add(jLabel30);
jLabel30.setBounds(116, 82, 36, 14);

jLabel31.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaBlu.png")));
jPanel1.add(jLabel31);
jLabel31.setBounds(116, 96, 36, 14);

jLabel32.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaRosso.png")));
jPanel1.add(jLabel32);
jLabel32.setBounds(155, 180, 36, 14);

jLabel33.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaRosso.png")));
jPanel1.add(jLabel33);
jLabel33.setBounds(155, 166, 36, 14);

jLabel34.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaRosso.png")));
jPanel1.add(jLabel34);
jLabel34.setBounds(155, 138, 36, 14);

jLabel35.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaRosso.png")));
jPanel1.add(jLabel35);
jLabel35.setBounds(155, 152, 36, 14);

jLabel36.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaRosso.png")));
jPanel1.add(jLabel36);
jLabel36.setBounds(155, 124, 36, 14);

jLabel37.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaRosso.png")));
jPanel1.add(jLabel37);
jLabel37.setBounds(155, 110, 36, 14);

jLabel38.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaRosso.png")));
jPanel1.add(jLabel38);
jLabel38.setBounds(155, 68, 36, 14);

jLabel39.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaRosso.png")));
jPanel1.add(jLabel39);
jLabel39.setBounds(155, 54, 36, 14);

jLabel40.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaRosso.png")));
jPanel1.add(jLabel40);
jLabel40.setBounds(155, 82, 36, 14);

jLabel41.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Graficatore/UnitaRosso.png")));
jPanel1.add(jLabel41);
jLabel41.setBounds(155, 96, 36, 14);

getContentPane().add(jPanel1, java.awt.BorderLayout.CENTER);

}//GEN-END:initComponents
// Variables declaration - do not modify//GEN-BEGIN:variables
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel9;
private javax.swing.JPanel jPanel1;

(HO OMESSO TUTTE LE ALTRE VARIABILI...)
// End of variables declaration//GEN-END:variables
}

QUESTO E' IL FILE GRAPHER.HTML

<HTML>
<HEAD>
<TITLE>Applet HTML Page</TITLE>
</HEAD>
<BODY>

<H3><HR WIDTH="100%">Applet HTML Page<HR WIDTH="100%"></H3>




<APPLET codebase="../" code="Graficatore/Grapher.class" width=251 height=231>
<param name="fa1" value="2">
<param name="fa2" value="5">
<param name="fa3" value="10">
<param name="fa4" value="8">
</APPLET>
</P>

<HR WIDTH="100%"><FONT SIZE=-1>Generated by NetBeans IDE</FONT>
</BODY>
</HTML>