title: How to remove part of a message java.lang.IllegalArgumentException on Excpetion handling
body: <p>I'm developping a Swing application, with a form on which I process several validations using exceptions. Knowing that since Java 7 it is possible to use a mutli-catch statement, I used it to improve my code, but since then the Stacktrace always begins with : </p>
  
  <p><strong>"java.lang.Exeption :"</strong> + Handling Exception Message.</p>
  
  <p>How I could remove <strong>"java.lang.Exeption :"</strong> of this message ?</p>
  
  <p>Here is an example from some of my validations and execution.</p>
  
  <p><strong>ActionEvent:</strong></p>
  
  <pre><code>  public void actionPerformed(ActionEvent arg0){
  
         //Validation 1
         NomeGrupoVazio(string1);
  
         //Validation 2
         ValidaString(string2);
  
         //Validation 3
         DiferenciarRMs(int1, int2, int3, int4);
  
  
     }
  </code></pre>
  
  <p><strong>Valitadions:</strong></p>
  
  <pre><code>private void NomeGrupoVazio(String nome) {
              if (nome.isEmpty()) {
                     throw new IllegalArgumentException("Preencha o nome do grupo!");
      }
  }
  
  private void ValidaString(String s) {
  
      Pattern pattern = Pattern.compile("[0-9]");
      Matcher matcher = pattern.matcher(s);
      if (matcher.find()) {
          throw new IllegalArgumentException(
                  "Por favor digite apenas caracteres não numéricos nos campos referentes aos nomes");
      }
  }
  
  private void DiferenciarRMs(int rm1, int rm2, int rm3, int rm4) {
      if (rm4 == 0) {
          if (rm1 == rm2 || rm1 == rm2 || rm1 == rm3 || rm2 == rm3) {
              throw new IllegalArgumentException(
                      "Todos os RM's precisam ser diferentes");
  
          }
      } else if (rm1 == rm2 || rm1 == rm3 || rm1 == rm4 || rm2 == rm3
              || rm2 == rm4 || rm3 == rm4) {
          throw new IllegalArgumentException(
                  "Todos os RM's precisam ser diferentes");
      }
  </code></pre>
  
  <p>Thanks in advance!</p>