public TokenMgrError() 
{

}

 public TokenMgrError(String message,
    int reason) 
{
      super(message);
      errorCode = reason;
}

 public TokenMgrError(boolean EOFSeen,
    int lexState,
    int errorLine,
    int errorColumn,
    String errorAfter,
    char curChar,
    int reason) 
{
      this(LexicalError(EOFSeen, lexState, errorLine, errorColumn, errorAfter, curChar), reason);
}

 protected static String LexicalError(boolean EOFSeen,
    int lexState,
    int errorLine,
    int errorColumn,
    String errorAfter,
    char curChar) 
{
      return("Lexical error at line " +
           errorLine + ", column " +
           errorColumn + ".  Encountered: " +
           (EOFSeen ? "< EOF > " : ("\"" + addEscapes(String.valueOf(curChar)) + "\"") + " (" + (int)curChar + "), ") +
           "after : \"" + addEscapes(errorAfter) + "\"");
}

Returns a detailed message for the Error when it is thrown by the token manager to indicate a lexical error. Parameters : EOFSeen : indicates if EOF caused the lexicl error curLexState : lexical state in which this error occured errorLine : line number when the error occured errorColumn : column number when the error occured errorAfter : prefix that was seen before this error occured curchar : the offending character Note: You can customize the lexical error message by modifying this method.

 protected static final String addEscapes(String str) 
{
                     
      StringBuffer retval = new StringBuffer();
      char ch;
      for (int i = 0; i <  str.length(); i++) {
        switch (str.charAt(i))
        {
           case 0 :
              continue;
           case '\b":
              retval.append("\\b");
              continue;
           case '\t":
              retval.append("\\t");
              continue;
           case '\n":
              retval.append("\\n");
              continue;
           case '\f":
              retval.append("\\f");
              continue;
           case '\r":
              retval.append("\\r");
              continue;
           case '\"":
              retval.append("\\\"");
              continue;
           case '\'":
              retval.append("\\\'");
              continue;
           case '\\":
              retval.append("\\\\");
              continue;
           default:
              if ((ch = str.charAt(i)) <  0x20 || ch  > 0x7e) {
                 String s = "0000" + Integer.toString(ch, 16);
                 retval.append("\\u" + s.substring(s.length() - 4, s.length()));
              } else {
                 retval.append(ch);
              }
              continue;
        }
      }
      return retval.toString();
}

Replaces unprintable characters by their espaced (or unicode escaped) equivalents in the given string

 public String getMessage() 
{
      return super.getMessage();
}

You can also modify the body of this method to customize your error messages. For example, cases like LOOP_DETECTED and INVALID_LEXICAL_STATE are not of end-users concern, so you can return something like : "Internal Error : Please file a bug report .... " from this method for such cases in the release version of your parser.