JInternalFrame nao mostra formulario [ RESOLVIDO ]

:cry:pessoal, eu tenho uma classe que JFrame que utiliza de botoes pra chamar um formulario que está em um jinternalframe
Seriam 5 formularios mas ele so mostra os dois primeiros
Ja nao sei o que fazer…tentei copiar os formularios que funcionam e fazer os outros utilizndo eles mas da o mesmo erro

“O JINTERNALFRAME APARECE SO QUE SEM O FORMULARIO!!!”

SEGUE AS CLASSES

classe inicio que chama os formularios

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * Inicio.java
 *
 * Created on 22/10/2009, 17:29:48
 */

package visao;


/**
 *
 * @author Bill
 */
public class Inicio extends javax.swing.JFrame {
    private int cont;
    private String m;
    CadastrarAluno ca;
    CriarConta co;
    Parcelas pa;
    CadastroCurso cc;
    Matricula ma;
    /** Creates new form Inicio */
    public Inicio() {
        initComponents();
        cont=0;
        m="";
        
    }
    
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        cAluno = new javax.swing.JButton();
        cConta = new javax.swing.JButton();
        cCurso = new javax.swing.JButton();
        jLabel1 = new javax.swing.JLabel();
        jComboBox1 = new javax.swing.JComboBox();
        janela = new javax.swing.JDesktopPane();
        cParcela = new javax.swing.JButton();
        matricula = new javax.swing.JButton();
        jMenuBar1 = new javax.swing.JMenuBar();
        jMenu1 = new javax.swing.JMenu();
        jMenuItem1 = new javax.swing.JMenuItem();
        jMenu2 = new javax.swing.JMenu();
        jMenuItem2 = new javax.swing.JMenuItem();
        jMenuItem3 = new javax.swing.JMenuItem();
        jMenu3 = new javax.swing.JMenu();
        jMenuItem4 = new javax.swing.JMenuItem();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Controle de Mensalidades");
        setMinimumSize(new java.awt.Dimension(1024, 768));
        setName("Inicio"); // NOI18N

        cAluno.setText("Cadastrar Aluno");
        cAluno.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                cAlunoActionPerformed(evt);
            }
        });

        cConta.setText("Criar Conta");
        cConta.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                cContaActionPerformed(evt);
            }
        });

        cCurso.setText("Cadastrar Curso");
        cCurso.setMaximumSize(new java.awt.Dimension(1024, 768));
        cCurso.setMinimumSize(new java.awt.Dimension(800, 600));
        cCurso.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                cCursoActionPerformed(evt);
            }
        });

        jLabel1.setText("Editar:");

        jComboBox1.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Aluno", "Curso", "Conta" }));

        cParcela.setText("Parcelas");
        cParcela.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                cParcelaActionPerformed(evt);
            }
        });

        matricula.setText("Matricular");
        matricula.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                matriculaActionPerformed(evt);
            }
        });

        jMenu1.setText("Arquivo");

        jMenuItem1.setText("Sair");
        jMenu1.add(jMenuItem1);

        jMenuBar1.add(jMenu1);

        jMenu2.setText("Usuário");

        jMenuItem2.setText("Editar Usuario");
        jMenu2.add(jMenuItem2);

        jMenuItem3.setText("Novo Usuário");
        jMenu2.add(jMenuItem3);

        jMenuBar1.add(jMenu2);

        jMenu3.setText("Ajuda");
        jMenu3.setMinimumSize(new java.awt.Dimension(800, 600));

        jMenuItem4.setText("Tópicos de Ajuda");
        jMenu3.add(jMenuItem4);

        jMenuBar1.add(jMenu3);

        setJMenuBar(jMenuBar1);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(10, 10, 10)
                        .addComponent(janela, javax.swing.GroupLayout.DEFAULT_SIZE, 988, Short.MAX_VALUE))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(cAluno)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(cConta, javax.swing.GroupLayout.PREFERRED_SIZE, 110, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(cParcela, javax.swing.GroupLayout.PREFERRED_SIZE, 103, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(cCurso, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(matricula, javax.swing.GroupLayout.PREFERRED_SIZE, 145, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(18, 18, 18)
                        .addComponent(jLabel1)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, 150, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(cAluno)
                    .addComponent(cConta)
                    .addComponent(cParcela)
                    .addComponent(cCurso, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(matricula)
                    .addComponent(jLabel1)
                    .addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addComponent(janela, javax.swing.GroupLayout.DEFAULT_SIZE, 657, Short.MAX_VALUE)
                .addContainerGap())
        );
    }// </editor-fold>

    private void cAlunoActionPerformed(java.awt.event.ActionEvent evt) {                                       
       if(cont==0){
           
            ca=new CadastrarAluno();
            janela.add(ca);
            cont=1;
            m="aluno";
       }else{
            if(m.contains("conta")){
               co.sair();
               ca=new CadastrarAluno();
               janela.add(ca);
               m="aluno";
           }else if(m.contains("parcela")){
               pa.sair();
               ca=new CadastrarAluno();
               janela.add(ca);
               m="aluno";
           }else if(m.contains("cCurso")){
               cc.sair();
               ca=new CadastrarAluno();
               janela.add(ca);
               m="aluno";
           }else if(m.contains("matricula")){
               ma.sair();
               ca=new CadastrarAluno();
               janela.add(ca);
               m="aluno";
           }

       }
        
}                                      

    private void cContaActionPerformed(java.awt.event.ActionEvent evt) {                                       

        if(cont==0){
            co=new CriarConta();
            janela.add(co);
            cont=1;
            m="conta";
       }else{
           if(m.contains("aluno")){
               ca.sair();
               co=new CriarConta();
               janela.add(co);
               m="conta";
           }else if(m.contains("parcela")){
               pa.sair();
               co=new CriarConta();
               janela.add(co);
               m="conta";
           }else if(m.contains("cCurso")){
               cc.sair();
               co=new CriarConta();
               janela.add(co);
               m="conta";
           }else if(m.contains("matricula")){
               ma.sair();
               co=new CriarConta();
               janela.add(co);
               m="conta";
           }

       }
}                                      

    private void cParcelaActionPerformed(java.awt.event.ActionEvent evt) {                                         
        if(cont==0){
            pa=new Parcelas();
            janela.add(pa);
            cont=1;
            m="parcela";
       }else{
           if(m.contains("aluno")){
               ca.sair();
               pa=new Parcelas();
               janela.add(pa);
               m="parcela";
           }else if(m.contains("conta")){
               co.sair();
               pa=new Parcelas();
               janela.add(pa);
               m="parcela";

           }else if(m.contains("cCurso")){
               cc.sair();
               pa=new Parcelas();
               janela.add(pa);
               m="parcela";
           }else if(m.contains("matricula")){
               ma.sair();
               pa=new Parcelas();
               janela.add(pa);
               m="parcela";
           }

       }
}                                        

    private void cCursoActionPerformed(java.awt.event.ActionEvent evt) {                                       
 if(cont==0){
            cc=new CadastroCurso();
            janela.add(cc);
            cont=1;
            m="cCurso";
       }else{
           if(m.contains("aluno")){
               ca.sair();
               cc=new CadastroCurso();
               janela.add(cc);
               m="cCurso";
           }else if(m.contains("conta")){
               co.sair();
               cc=new CadastroCurso();
               janela.add(cc);
               m="cCurso";

           }else if(m.contains("parcela")){
               pa.sair();
               cc=new CadastroCurso();
               janela.add(cc);
               m="cCurso";
           }else if(m.contains("matricula")){
               ma.sair();
               cc=new CadastroCurso();
               janela.add(cc);
               m="cCurso";
           }

       }
}                                      

    private void matriculaActionPerformed(java.awt.event.ActionEvent evt) {                                          
        if(cont==0){
            ma=new Matricula();
            janela.add(ma);
            cont=1;
            m="matricula";
       }else{
           if(m.contains("aluno")){
               ca.sair();
               ma=new Matricula();
               janela.add(ma);
               m="matricula";
           }else if(m.contains("conta")){
               co.sair();
               ma=new Matricula();
               janela.add(ma);
               m="matricula";

           }else if(m.contains("parcela")){
               pa.sair();
               ma=new Matricula();
               janela.add(ma);
               m="matricula";
           }else if(m.contains("cCurso")){
               cc.sair();
               ma=new Matricula();
               janela.add(ma);
               m="matricula";
           }

       }
}                                         

    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                
            }
        });
    }

    // Variables declaration - do not modify
    private javax.swing.JButton cAluno;
    private javax.swing.JButton cConta;
    private javax.swing.JButton cCurso;
    private javax.swing.JButton cParcela;
    private javax.swing.JComboBox jComboBox1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JMenu jMenu1;
    private javax.swing.JMenu jMenu2;
    private javax.swing.JMenu jMenu3;
    private javax.swing.JMenuBar jMenuBar1;
    private javax.swing.JMenuItem jMenuItem1;
    private javax.swing.JMenuItem jMenuItem2;
    private javax.swing.JMenuItem jMenuItem3;
    private javax.swing.JMenuItem jMenuItem4;
    private javax.swing.JDesktopPane janela;
    private javax.swing.JButton matricula;
    // End of variables declaration

}

/////////////////////////////////////////////////////////////////////////////////////////////////

classe jinternalframe com formulario que funciona

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * CadastrarAluno.java
 *
 * Created on 24/10/2009, 18:04:56
 */

package visao;

/**
 *
 * @author Bill
 */
public class CadastrarAluno extends javax.swing.JInternalFrame {

    /** Creates new form CadastrarAluno */
    public CadastrarAluno() {
        initComponents();
        setBorder(null);
        setAutoscrolls(true);
        setFrameIcon(null);
        setLayout(null);
        setTitle("Cadastro de Aluno");
        setResizable(false);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }
    public void sair(){
        dispose();
    }
    
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        buttonGroup1 = new javax.swing.ButtonGroup();
        buttonGroup2 = new javax.swing.ButtonGroup();
        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();
        jTextField1 = new javax.swing.JTextField();
        jTextField2 = new javax.swing.JTextField();
        jTextField3 = new javax.swing.JTextField();
        jTextField4 = new javax.swing.JTextField();
        jTextField5 = new javax.swing.JTextField();
        jTextField6 = new javax.swing.JTextField();
        jTextField7 = new javax.swing.JTextField();
        jRadioButton1 = new javax.swing.JRadioButton();
        jRadioButton2 = new javax.swing.JRadioButton();
        jRadioButton3 = new javax.swing.JRadioButton();
        jButton1 = new javax.swing.JButton();
        jRadioButton4 = new javax.swing.JRadioButton();
        jRadioButton5 = new javax.swing.JRadioButton();
        jRadioButton6 = new javax.swing.JRadioButton();
        jRadioButton7 = new javax.swing.JRadioButton();
        jLabel13 = new javax.swing.JLabel();
        jTextField8 = new javax.swing.JTextField();
        jTextField9 = new javax.swing.JTextField();
        jTextField10 = new javax.swing.JTextField();
        jTextField11 = new javax.swing.JTextField();
        jLabel14 = new javax.swing.JLabel();

        setMaximumSize(new java.awt.Dimension(764, 489));
        setMinimumSize(new java.awt.Dimension(764, 489));
        setPreferredSize(new java.awt.Dimension(764, 489));
        getContentPane().setLayout(null);

        jLabel1.setFont(new java.awt.Font("Tahoma", 0, 36));
        jLabel1.setText("Cadastro de Alunos");
        getContentPane().add(jLabel1);
        jLabel1.setBounds(10, 10, 320, 50);

        jLabel2.setText("Data de Nascimento:");
        getContentPane().add(jLabel2);
        jLabel2.setBounds(10, 300, 110, 14);

        jLabel3.setText("ID:");
        getContentPane().add(jLabel3);
        jLabel3.setBounds(10, 90, 80, 14);

        jLabel4.setText("Nome do aluno:");
        getContentPane().add(jLabel4);
        jLabel4.setBounds(10, 120, 80, 14);

        jLabel5.setText("RG:");
        getContentPane().add(jLabel5);
        jLabel5.setBounds(10, 150, 80, 14);

        jLabel6.setText("CPF:");
        getContentPane().add(jLabel6);
        jLabel6.setBounds(10, 180, 80, 14);

        jLabel7.setText("Título de Eleitor:");
        getContentPane().add(jLabel7);
        jLabel7.setBounds(10, 210, 80, 14);

        jLabel8.setText("Sexo:");
        getContentPane().add(jLabel8);
        jLabel8.setBounds(10, 330, 80, 14);

        jLabel9.setText("Nome do pai:");
        getContentPane().add(jLabel9);
        jLabel9.setBounds(10, 240, 80, 14);

        jLabel10.setText("Nome da mãe:");
        getContentPane().add(jLabel10);
        jLabel10.setBounds(10, 270, 80, 14);

        jLabel11.setText("Estado Civil:");
        getContentPane().add(jLabel11);
        jLabel11.setBounds(10, 360, 80, 14);

        jLabel12.setText("1");
        getContentPane().add(jLabel12);
        jLabel12.setBounds(120, 90, 420, 14);
        getContentPane().add(jTextField1);
        jTextField1.setBounds(120, 300, 420, 20);
        getContentPane().add(jTextField2);
        jTextField2.setBounds(120, 270, 420, 20);
        getContentPane().add(jTextField3);
        jTextField3.setBounds(120, 240, 420, 20);
        getContentPane().add(jTextField4);
        jTextField4.setBounds(120, 210, 420, 20);
        getContentPane().add(jTextField5);
        jTextField5.setBounds(120, 180, 140, 20);
        getContentPane().add(jTextField6);
        jTextField6.setBounds(120, 150, 140, 20);
        getContentPane().add(jTextField7);
        jTextField7.setBounds(120, 120, 420, 20);

        buttonGroup1.add(jRadioButton1);
        jRadioButton1.setText("Masculino");
        getContentPane().add(jRadioButton1);
        jRadioButton1.setBounds(120, 330, 100, 23);

        buttonGroup1.add(jRadioButton2);
        jRadioButton2.setText("Feminino");
        getContentPane().add(jRadioButton2);
        jRadioButton2.setBounds(230, 330, 100, 23);

        buttonGroup2.add(jRadioButton3);
        jRadioButton3.setText("Solteiro");
        getContentPane().add(jRadioButton3);
        jRadioButton3.setBounds(120, 360, 100, 23);

        jButton1.setText("Cadastrar");
        getContentPane().add(jButton1);
        jButton1.setBounds(260, 400, 110, 23);

        buttonGroup2.add(jRadioButton4);
        jRadioButton4.setText("Casado");
        getContentPane().add(jRadioButton4);
        jRadioButton4.setBounds(230, 360, 100, 23);

        buttonGroup2.add(jRadioButton5);
        jRadioButton5.setText("Viúvo");
        getContentPane().add(jRadioButton5);
        jRadioButton5.setBounds(340, 360, 80, 23);

        buttonGroup2.add(jRadioButton6);
        jRadioButton6.setText("Divorciado");
        getContentPane().add(jRadioButton6);
        jRadioButton6.setBounds(540, 360, 100, 23);

        buttonGroup2.add(jRadioButton7);
        jRadioButton7.setText("Separado");
        getContentPane().add(jRadioButton7);
        jRadioButton7.setBounds(430, 360, 90, 23);

        jLabel13.setText("Email:");
        getContentPane().add(jLabel13);
        jLabel13.setBounds(270, 150, 28, 14);
        getContentPane().add(jTextField8);
        jTextField8.setBounds(490, 150, 120, 20);
        getContentPane().add(jTextField9);
        jTextField9.setBounds(360, 150, 120, 20);
        getContentPane().add(jTextField10);
        jTextField10.setBounds(490, 180, 120, 20);
        getContentPane().add(jTextField11);
        jTextField11.setBounds(360, 180, 120, 20);

        jLabel14.setText("Telefone:");
        getContentPane().add(jLabel14);
        jLabel14.setBounds(270, 180, 60, 14);

        pack();
    }// </editor-fold>                        


    // Variables declaration - do not modify                     
    private javax.swing.ButtonGroup buttonGroup1;
    private javax.swing.ButtonGroup buttonGroup2;
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel10;
    private javax.swing.JLabel jLabel11;
    private javax.swing.JLabel jLabel12;
    private javax.swing.JLabel jLabel13;
    private javax.swing.JLabel jLabel14;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JLabel jLabel6;
    private javax.swing.JLabel jLabel7;
    private javax.swing.JLabel jLabel8;
    private javax.swing.JLabel jLabel9;
    private javax.swing.JRadioButton jRadioButton1;
    private javax.swing.JRadioButton jRadioButton2;
    private javax.swing.JRadioButton jRadioButton3;
    private javax.swing.JRadioButton jRadioButton4;
    private javax.swing.JRadioButton jRadioButton5;
    private javax.swing.JRadioButton jRadioButton6;
    private javax.swing.JRadioButton jRadioButton7;
    private javax.swing.JTextField jTextField1;
    private javax.swing.JTextField jTextField10;
    private javax.swing.JTextField jTextField11;
    private javax.swing.JTextField jTextField2;
    private javax.swing.JTextField jTextField3;
    private javax.swing.JTextField jTextField4;
    private javax.swing.JTextField jTextField5;
    private javax.swing.JTextField jTextField6;
    private javax.swing.JTextField jTextField7;
    private javax.swing.JTextField jTextField8;
    private javax.swing.JTextField jTextField9;
    // End of variables declaration                   

}

////////////////////////////////////////////////////////////////////////////////////////////////////////////

classe jinternalframe com formulario q nao funciona

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * Matricula.java
 *
 * Created on 26/10/2009, 18:11:04
 */

package visao;

/**
 *
 * @author Bill
 */
public class Matricula extends javax.swing.JInternalFrame {

    /** Creates new form Matricula */
    public Matricula() {
        initComponents();
        setBorder(null);
        setAutoscrolls(true);
        setFrameIcon(null);
        setLayout(null);
        setTitle("Matricula");
        setResizable(false);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }
     public void sair(){
        dispose();
    }
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jTextField1 = new javax.swing.JTextField();
        jButton1 = new javax.swing.JButton();
        jLabel3 = new javax.swing.JLabel();
        jLabel4 = new javax.swing.JLabel();
        jLabel5 = new javax.swing.JLabel();
        jComboBox1 = new javax.swing.JComboBox();
        jButton2 = new javax.swing.JButton();

        setTitle("Matricula");
        setMaximumSize(new java.awt.Dimension(764, 489));
        setMinimumSize(new java.awt.Dimension(764, 489));
        setName("Matricula"); // NOI18N
        setPreferredSize(new java.awt.Dimension(764, 489));

        jLabel1.setFont(new java.awt.Font("Tahoma", 0, 36)); // NOI18N
        jLabel1.setText("Matricula");

        jLabel2.setText("Nome do Aluno:");

        jButton1.setText("Buscar");

        jLabel3.setText("ID Aluno:");

        jLabel4.setText("0");

        jLabel5.setText("Curso:");

        jComboBox1.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));

        jButton2.setText("Matricular");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addContainerGap()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel1)
                            .addGroup(layout.createSequentialGroup()
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                    .addComponent(jLabel2)
                                    .addComponent(jLabel3)
                                    .addComponent(jLabel5))
                                .addGap(44, 44, 44)
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                    .addComponent(jLabel4)
                                    .addGroup(layout.createSequentialGroup()
                                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                                            .addComponent(jComboBox1, javax.swing.GroupLayout.Alignment.LEADING, 0, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                            .addComponent(jTextField1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 388, Short.MAX_VALUE))
                                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                                        .addComponent(jButton1))))))
                    .addGroup(layout.createSequentialGroup()
                        .addGap(266, 266, 266)
                        .addComponent(jButton2)))
                .addContainerGap(32, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jLabel1)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jButton1))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel3)
                    .addComponent(jLabel4))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel5)
                    .addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(75, 75, 75)
                .addComponent(jButton2)
                .addContainerGap(150, Short.MAX_VALUE))
        );

        getAccessibleContext().setAccessibleName("Matricula");

        pack();
    }// </editor-fold>                        


    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JComboBox jComboBox1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JTextField jTextField1;
    // End of variables declaration                   
 :roll: 
}

MEAJUDEMPELAMORDEDEUS :cry: :cry: :cry: :cry: :cry: :cry: :cry:

Antes de tentar responder sua pergunta, um conselho: evite postar listagens de código muito longas, isso afugenta possíveis respondentes. Mas, prosseguindo, peço que experimente o seguinte:

janela.add(<variável do JInternalFrame>);
<variável do JInternalFrame>.setLocation(0, 0);
<variável do JInternalFrame>.setSize(100, 100);
<variável do JInternalFrame>.setVisible(true);

Valeu pela dica
Na verdade tive que por o codigo todo(nao toooodo) porq provavelmente nao teria como ver o problema sem compilar ele

Eu tentei setar essas propriedades que vc postou tambem e nao muda em nada

Eu to aqui refazendo todo ele :cry: vamo ver se nao da o mesmo erro

Esse projeto eu mostrei pro meu professor e ele tambem nao conseguiu visualizar erros, mas nao imagin o porque dele simplesmente nao mostrar o formulario

:? :? :? :roll: :roll:

Pessoal
Acho que esse erro vai continuar no mistério
Criei outro projeto e dessa vez nao apresentou erros

Obrigado pela atencao de todos