Error printing twice

Question

String error_msg = (String)((DynamoHttpServletRequest)request).getObjectParameter("message");
int msg=error_msg.indexOf("some string");
if (msg >=0) {
     StringBuffer new_error_msg= new StringBuffer();
((DynamoHttpServletRequest)request).setParameter("message",new_error_msg.toString());
else {  //when it enters this else loop, the error message is printing twice. how to restrict this
if (error_msg.startsWith("the ShipTo me")) {
     StringBuffer new_error_msg= new StringBuffer();
if (error_msg.indexOf("phone number") >= 0) {
new_error_msg.append("The " + error_msg.substring(14));
else {
          new_error_msg.append(error_msg.substring(14));
error_msg = "The "+ new_error_msg.toString();
((DynamoHttpServletRequest)request).setParameter("message",error_msg.toString());
else if (error_msg.indexOf("zip code is not valid") > -1 ) {
     ((DynamoHttpServletRequest)request).setParameter("message","Invalid Zip");
When it enters the first else loop, error messages are printing twice. how to stop this error messages printing twice?It should print error messages once.

Answer 1

I corrected the problem by doing the following:
1. created a commit action in my ui model and renamed it to save.
2. put a UniquePkValidationBean on my primary key so that the overridden setAttributeInternal method would throw a JboException
Thanks,
David