Server side validation( using StringBuilder object, to store error messages)

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Java

Hello guys

I am trying to do server side validation. i am storing error messages in StringBuilder object. If, I enter values in wrong format, Then it is working fine.....but ,if I enter values in proper format, it is failing to display success msg...

I found that Problem is with StringBuilder object. but unable to figure out the exact problem.

If I use length(), method instead of equals() method then it works fine.

...pls help me to sort out this issue

public void validateForm(ActionRequest request, ActionResponse actionResponse)
	   
	{   
	        String firstName = request.getParameter("firstName");
	       
	        String lastName =  request.getParameter("lastName");
	        
	        String telephone = request.getParameter("phone");
	        
	        String email =  request.getParameter("email");
	        
	        String comments= request.getParameter("comments");
	        
	        StringBuilder errorMsg=new StringBuilder();
	        
	        //StringBuffer errorMsg=new StringBuffer();
	        
	        System.out.println(errorMsg.equals(""));
	        System.out.println(errorMsg.length());
	        System.out.println("errrr="+errorMsg);
	       
	        String fname="[a-zA-z]+([ '-][a-zA-Z]+)*";
	        
	        String lname="[a-zA-z]+([ '-][a-zA-Z]+)*";
	        
	        String matchPhoneNumberPattern="[0-9]*";
	        
	        String emailPattern="^[\\w-_\\.+]*[\\w-_\\.]\\@([\\w]+\\.)+[\\w]+[\\w]$";
	        
	        if (firstName == null ||firstName.equals(""))
	        {
	        	errorMsg.append("Please Enter First Name "+"<br />");
	            
	        }
	        else if(!firstName.matches(fname))
	        {
	            errorMsg.append("Please Enter First Namet "+"<br />");
	            
	        }
	       
	        if(lastName == null ||lastName .isEmpty())
	        {
	            errorMsg.append("Please Enter Last Name "+"<br />");
	            
	        }
	        else if(!lastName.matches(lname))
	        {
	            errorMsg.append("Enter lastname in Name Format "+"<br />");
	           
	        }
	       
	        if(telephone  == null || telephone.isEmpty())
	        {
	            errorMsg.append("Please Enter Telephone Number "+"<br />");
	            
	        }
	        else if(!telephone.matches(matchPhoneNumberPattern))
	        {
	           
	            errorMsg.append("Invalid Number please Enter valid number"+"<br />");
	          
	        }
	        if(email == null ||  email.isEmpty())
	        {
	            errorMsg.append("Please Enter Email "+"<br />");
	            
	        }
	        else if(!email.matches(emailPattern))
	        {
	           
	            errorMsg.append("Invalid email id"+"<br />");
	       
	        }
	        if (comments == null ||  comments.equals(""))
	        {
	            errorMsg.append("You must Enter Comments "+"<br />");
	            
	        }
	        
	       
	      /*IN all cases this if block is executing,EVen though i enter all fields in proper format */
	        System.out.println(errorMsg.equals(""));
	        
               if(!errorMsg.equals(""))
	        
	        {
	            request.setAttribute("errorMsg", errorMsg);
	            request.setAttribute("phone", telephone);
	            request.setAttribute("email", email);

	           System.out.println("If block..........!");
	           
	        }
	        else
	        {
	            String successMsg="Form Submited Successfully";
	           
	            request.setAttribute("successMsg", successMsg);
	            System.out.println("done..........!");
	        }
	                      
	      
	        	    }