Custom Attributes in Liferay

Follow the steps for making custom attributes-

Go to Control Panel -> User - > Custom Attribute -> Add Custom Attribute

An Attribute is a key and type of the field (once saved) cannot be changed at all...

Accessing Custom Attribute Pragmatically

ThemeDisplay td=(ThemeDisplay)request.getAttribute(Web_Keys.THEME_DISPLAY);
User u=td.getUser();
System.out.println(u.getExpendoBridge().getAttribute("CustomAttributeName"));

Setting Attribute Pragmatically

ThemeDisplay td=(ThemeDisplay)request.getAttribute(Web_Keys.THEME_DISPLAY);
User u=td.getUser();
System.out.println(u.getExpendoBridge().setAttribute("CustomAttributeName","Value"));

Adding custom Attribute form element at Sign In Portlet

write the following code in /root/html/portlet/login/create_account.jsp

<liferay ui:custom-attribute-list
                  className="com.liferay.portal.model.user"
                  editable="<%=true%>"
                  label="<%=true%>">

but this will not visible to due to permission. So, login as admin and provide permission to guest to see and modify custom field through control panel.