code: protected void validate(String operationType) throws Exception
  	{
  		super.validate(operationType);
  
  		MPSString sessionid_validator = new MPSString();
  		sessionid_validator.setConstraintIsReq(MPSConstants.DELETE_CONSTRAINT, true);
  		sessionid_validator.validate(operationType, sessionid, "\"sessionid\"");
  		
  		MPSString username_validator = new MPSString();
  		username_validator.setConstraintCharSetRegEx(MPSConstants.GENERIC_CONSTRAINT,"[ a-zA-Z0-9_#.:@=-]+");
  		username_validator.setConstraintMaxStrLen(MPSConstants.GENERIC_CONSTRAINT, 128);
  		username_validator.setConstraintMinStrLen(MPSConstants.GENERIC_CONSTRAINT, 1);
  		username_validator.setConstraintIsReq(MPSConstants.ADD_CONSTRAINT, true);
  		username_validator.validate(operationType, username, "\"username\"");
  		
  		MPSString password_validator = new MPSString();
  		password_validator.setConstraintMaxStrLen(MPSConstants.GENERIC_CONSTRAINT, 128);
  		password_validator.setConstraintMinStrLen(MPSConstants.GENERIC_CONSTRAINT, 1);
  		password_validator.setConstraintIsReq(MPSConstants.ADD_CONSTRAINT, true);
  		password_validator.validate(operationType, password, "\"password\"");
  		
  		MPSInt session_timeout_validator = new MPSInt();
  		session_timeout_validator.validate(operationType, session_timeout, "\"session_timeout\"");
  		
  	}
docs: <pre>
  Performs generic data validation for the operation to be performed
  </pre>