form validate: when using System.out.println() ,there is information print

[wu qihua]

   I want to get the information about a field the form bean,and let it 
print the information in the funtion of validate.but actually it did not 
work according to my intention,it DO print nothing.every time I refresh the 
browse ,and click the submit button.It just print this information

  2002-8-28 11:11:10 org.apache.struts.action.RequestProcessor process
   information: Processing a 'POST' for path '/logon'


public ActionErrors validate( ...)
  {
      System.out.println(book);
      if (book=="java"){
        System.out.println(book);
                throw new UnsupportedOperationException("Easy Struts : not ....");
          }
       else
           return null;
        }



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