problemas al generar el .JAR en netbeans (Xlint)

Cuando pulso sobre clean and build me aprecen algunos errores como:

E:\Carpeta de catalogo\Nuevo catalogo\Catalogo\src\principal\cargar_imagenes.java:180: warning: [unchecked] unchecked call to addElement(E) as a member of the raw type DefaultListModel
modelo.addElement(cdr.getString(2));
where E is a type-variable:
E extends Object declared in class DefaultListModel
E:\Carpeta de catalogo\Nuevo catalogo\Catalogo\src\principal\cargar_imagenes.java:183: warning: [unchecked] unchecked call to setModel(ListModel) as a member of the raw type JList
jl_clientes.setModel(modelo);
where E is a type-variable:
E extends Object declared in class JList

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Y este es el codigo donde marca el error:

--------------------------------------------------------------

private void jtf_clienteKeyReleased(java.awt.event.KeyEvent evt) {
ResultSet cdr = null;
if(jtf_cliente.getText().isEmpty()){
modelo.clear();
}else{
try {
String nombre = jtf_cliente.getText();
String consulta = "Select * from clientes where nombre_cliente like '%"+nombre+"%';";
cdr = Gestion.Consultas(consulta);
modelo.clear();
while(cdr.next()){

modelo.addElement(cdr.getString(2));

}
jl_clientes.setModel(modelo);
} catch (SQLException ex) {
JOptionPane.showMessageDialog(null,"No se pudo realizar consulta:"+ex,"Error",JOptionPane.ERROR_MESSAGE);
}
}

// TODO add your handling code here:
}