Partly normalizing form binding.

core/src/main/java/hudson/security/HudsonPrivateSecurityRealm.java

@@ -81,6 +81,8 @@ import java.util.MissingResourceException;
 import java.util.ResourceBundle;
 import java.util.logging.Level;
 import java.util.logging.Logger;
+import org.kohsuke.accmod.Restricted;
+import org.kohsuke.accmod.restrictions.NoExternalUse;
 
 /**
  * {@link SecurityRealm} that performs authentication by looking up {@link User}.
@@ -130,6 +132,11 @@ public class HudsonPrivateSecurityRealm extends AbstractPasswordBasedSecurityRea
         return !disableSignup;
     }
 
+    @Restricted(NoExternalUse.class) // Jelly
+    public boolean getAllowsSignup() {
+        return allowsSignup();
+    }
+
     /**
      * Checks if captcha is enabled on user signup.
      *
@@ -681,11 +688,6 @@ public class HudsonPrivateSecurityRealm extends AbstractPasswordBasedSecurityRea
         public String getDisplayName() {
             return Messages.HudsonPrivateSecurityRealm_DisplayName();
         }
-
-        @Override
-        public String getHelpFile() {
-            return "/help/security/private-realm.html"; 
-        }
     }
 
     private static final Filter CREATE_FIRST_USER_FILTER = new Filter() {

core/src/main/resources/hudson/security/HudsonPrivateSecurityRealm/config.jelly

@@ -25,8 +25,8 @@ THE SOFTWARE.
 <?jelly escape-by-default='true'?>
 <j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson"
   xmlns:f="/lib/form">
-  <f:entry title="" help="/help/security/private-realm/allow-signup.html">
-    <f:checkbox name="privateRealm.allowsSignup" checked="${h.defaultToTrue(instance.allowsSignup())}" title="${%Allow users to sign up}" />
+  <f:entry field="allowsSignup">
+    <f:checkbox default="true" title="${%Allow users to sign up}"/>
   </f:entry>
   <j:if test="${size(h.captchaSupportDescriptors) gt 0}">
     <f:entry>