Program: 30411
Project: 30411
Buggy source:
/** 
 * Authenticate the user by prompting for a username and password. <p>
 * @return true in all cases since this <code>LoginModule</code>should not be ignored.
 * @exception FailedLoginException if the authentication fails. <p>
 * @exception LoginException if this <code>LoginModule</code>is unable to perform the authentication.
 */
public boolean login() throws LoginException {
  if (callbackHandler == null) {
    throw new LoginException("String_Node_Str" + "String_Node_Str");
  }
  try {
    String[] as=new String[ks.size()];
    String[] aliasString=new String[ks.size()];
    Enumeration aliases=ks.aliases();
    for (int i=0; i < ks.size(); i++) {
      aliasString[i]=(String)aliases.nextElement();
      as[i]=((X509Certificate)ks.getCertificate(aliasString[i])).getSubjectDN().getName();
    }
    Callback[] callbacks=new Callback[1];
    callbacks[0]=new ChoiceCallback(localStrings.getLocalString("String_Node_Str","String_Node_Str"),as,0,false);
    callbackHandler.handle(callbacks);
    String[] choices=((ChoiceCallback)callbacks[0]).getChoices();
    int[] idx=((ChoiceCallback)callbacks[0]).getSelectedIndexes();
    if (idx == null) {
      throw new LoginException("String_Node_Str");
    }
 else     if (idx[0] == -1) {
      throw new LoginException("String_Node_Str");
    }
    if (debug) {
      if (_logger.isLoggable(Level.FINE)) {
        _logger.log(Level.FINE,"String_Node_Str" + "String_Node_Str");
        for (int i=0; i < idx.length; i++) {
          _logger.log(Level.FINE,aliasString[idx[i]]);
        }
      }
    }
    this.alias=aliasString[idx[0]];
    certificate=(X509Certificate)ks.getCertificate(alias);
    if (debug) {
      if (_logger.isLoggable(Level.FINE)) {
        _logger.log(Level.FINE,"String_Node_Str" + "String_Node_Str");
      }
    }
    succeeded=true;
    return true;
  }
 catch (  java.io.IOException ioe) {
    throw new LoginException(ioe.toString());
  }
catch (  UnsupportedCallbackException uce) {
    throw new LoginException("String_Node_Str" + uce.getCallback().toString() + "String_Node_Str"+ "String_Node_Str");
  }
catch (  Exception e) {
    throw new LoginException(e.toString());
  }
}

Fixed version (ground truth):
/** 
 * Authenticate the user by prompting for a username and password. <p>
 * @return true in all cases since this <code>LoginModule</code>should not be ignored.
 * @exception LoginException if this <code>LoginModule</code>is unable to perform the authentication.
 */
public boolean login() throws LoginException {
  if (callbackHandler == null) {
    throw new LoginException("String_Node_Str" + "String_Node_Str");
  }
  try {
    String[] as=new String[ks.size()];
    String[] aliasString=new String[ks.size()];
    Enumeration aliases=ks.aliases();
    for (int i=0; i < ks.size(); i++) {
      aliasString[i]=(String)aliases.nextElement();
      as[i]=((X509Certificate)ks.getCertificate(aliasString[i])).getSubjectDN().getName();
    }
    Callback[] callbacks=new Callback[1];
    callbacks[0]=new ChoiceCallback(localStrings.getLocalString("String_Node_Str","String_Node_Str"),as,0,false);
    callbackHandler.handle(callbacks);
    int[] idx=((ChoiceCallback)callbacks[0]).getSelectedIndexes();
    if (idx == null) {
      throw new LoginException("String_Node_Str");
    }
 else     if (idx[0] == -1) {
      throw new LoginException("String_Node_Str");
    }
    if (debug) {
      if (_logger.isLoggable(Level.FINE)) {
        _logger.log(Level.FINE,"String_Node_Str" + "String_Node_Str");
        for (int i=0; i < idx.length; i++) {
          _logger.log(Level.FINE,aliasString[idx[i]]);
        }
      }
    }
    this.alias=aliasString[idx[0]];
    certificate=(X509Certificate)ks.getCertificate(alias);
    if (debug) {
      if (_logger.isLoggable(Level.FINE)) {
        _logger.log(Level.FINE,"String_Node_Str" + "String_Node_Str");
      }
    }
    succeeded=true;
    return true;
  }
 catch (  java.io.IOException ioe) {
    throw new LoginException(ioe.toString());
  }
catch (  UnsupportedCallbackException uce) {
    throw new LoginException("String_Node_Str" + uce.getCallback().toString() + "String_Node_Str"+ "String_Node_Str");
  }
catch (  Exception e) {
    throw new LoginException(e.toString());
  }
}