# Multiple LoginFormsProviderFactory implementations **URL:** \ **Category:** Extending the server\ **Tags:** authentication, themes\ **Created:** [December 22, 2023, 10:43am UTC](https://forum.keycloak.org/t/multiple-loginformsproviderfactory-implementations/23840 "2023-12-22T10:43:51Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![npasic](https://avatars.discourse-cdn.com/v4/letter/n/e19b73/32.png) [@npasic](https://forum.keycloak.org/u/npasic)\ **Post date:** [December 22, 2023, 10:43am UTC](https://forum.keycloak.org/t/multiple-loginformsproviderfactory-implementations/23840/1 "2023-12-22T10:43:51Z")
Hi, Probably, some of you already tried to do something similar but I wasn’t able to find any valuable response. The problem is: There is a need to have multiple (currently 2) themes deployed in a Keycloak server instance, different themes are used by different Realms. Those themes are trying to change the default login theme behavior. I’m implementing LoginFormsProviderFactory in order to provide my own LoginFormsProvider that extends FreeMarkerLoginFormsProvider. But the problem is, that only 1 is visible to the Keycloak, the other one is ignored, unless, I uninstall one theme from Keycloak. There is no possibility of having multiple implementations of LoginFormsProviderFactory (one per theme/jar) deployed at the same time in the Keycloak. It seems that Keycloak is specifically asking for getId() method from Factory to be exactly like this: ```auto @Override public String getId() { return "freemarker"; } ``` If anything else, is returned, the Keycloak does not see it, the login page rendering fails and an error is thrown ```auto ERROR [org.keycloak.services.error.KeycloakErrorHandler] (executor-thread-2) Uncaught server error: java.lang.NullPointerException: Cannot invoke "org.keycloak.forms.login.LoginFormsProvider.setAuthenticationSession(org.keycloak.sessions.AuthenticationSessionModel)" because the return value of "org.keycloak.models.KeycloakSession.getProvider(java.lang.Class)" is null ``` Does anyone have any idea how to overcome this problem? I’m using Keycloak 21.0.2 at the moment. Regards ---
**Author:** ![dasniko](https://yyz2.discourse-cdn.com/free1/user_avatar/forum.keycloak.org/dasniko/32/2969_2.png) [@dasniko](https://forum.keycloak.org/u/dasniko)\ **Post date:** [December 22, 2023, 1:58pm UTC](https://forum.keycloak.org/t/multiple-loginformsproviderfactory-implementations/23840/2 "2023-12-22T13:58:10Z")
Try to implement a kind of “composite” factory, which delivers a proper provider depending on the current realm. Set this provider factory as the default: ```java public class CompositeLoginFormsProviderFactory implements LoginFormsProviderFactory { public static final String PROVIDER_ID = "composite"; @Override public LoginFormsProvider create(KeycloakSession session) { if (session.getContext().getRealm().getName().equals("myRealm")) { return new CustomLoginFormsProvider(session); } else { return new FreeMarkerLoginFormsProvider(session); } } @Override public void init(Config.Scope config) { } @Override public void postInit(KeycloakSessionFactory factory) { } @Override public void close() { } @Override public String getId() { return PROVIDER_ID; } } ``` Configure as default provider: ```auto spi-login-provider=composite ``` ---
**Author:** ![npasic](https://avatars.discourse-cdn.com/v4/letter/n/e19b73/32.png) [@npasic](https://forum.keycloak.org/u/npasic)\ **Post date:** [December 22, 2023, 3:40pm UTC](https://forum.keycloak.org/t/multiple-loginformsproviderfactory-implementations/23840/3 "2023-12-22T15:40:34Z")
> [@dasniko](#): > > Try to implement a kind of “composite” factory, which delivers a proper provider depending on the current realm. Set this provider factory as the default: Hi @dasniko, Thanks for the answer. Well, the problem is a bit deeper than that. The problem is that 2 themes are deployed within 2 different jars. For example, within **jarA** there is a **ThemeA** , and _login forms provider_ should do one thing, and within **jarB** , there is a **ThemeB** which does a different thing. Obviously, I can’t create 1 class like you shared, since I can’t “call” **jarB** from **jarA** and the way around. I would expect that If I set **ThemeA** as the login theme for **RealmA** , the _login forms provider_ from **ThemeA** should be invoked, the same when talking about **RealmB**. The case here is that even if I set **ThemeB** for the **RealmB** _login_ theme, **ThemeA** will be invoked, and the _login forms provider_ from **ThemeA** will be invoked, even though, I try login into **RealmB**. Probably, there is some logic behind that decides which forms provider should be invoked, since, obviously, the required one is not invoked. Is there any propagation, like: you provided **2** _login forms providers_ with the same **id=freemarker** , I’ll invoke firstly the one from **ThemeA** , and if you return the default one _FreeMarkerLoginFormsProvider_, I’ll call then **ThemeB**? Detailed Example: I try to log in into **RealmB** which uses **ThemeB** , and Keycloak, for some reason, invokes _login forms provider_ from **ThemeA** , where I make something similar to what you shared in the code example above, and since the check said that **ThemeA** forms provider should not be used, and I provide the default one like you did, will then Keycloak call again forms provider from the **ThemeB**? If what I described above is possible, then, probably somewhere I should add all those custom providers, right? ---
**Author:** ![ElsevierVivek](https://yyz2.discourse-cdn.com/free1/user_avatar/forum.keycloak.org/elseviervivek/32/9775_2.png) [@ElsevierVivek](https://forum.keycloak.org/u/ElsevierVivek)\ **Post date:** [February 14, 2024, 9:15am UTC](https://forum.keycloak.org/t/multiple-loginformsproviderfactory-implementations/23840/4 "2024-02-14T09:15:03Z")
Hi , did you get a solution for this issue. ---
**Author:** ![npasic](https://avatars.discourse-cdn.com/v4/letter/n/e19b73/32.png) [@npasic](https://forum.keycloak.org/u/npasic)\ **Post date:** [April 9, 2024, 9:52am UTC](https://forum.keycloak.org/t/multiple-loginformsproviderfactory-implementations/23840/5 "2024-04-09T09:52:05Z")
Hi, There is no solution to using it in the described way. Keycloak can’t handle multiple jars with the same/similar implementation since it’s not “smart” enough to check the name of the Theme when it should invoke a lib. This is very poorly solved. I solved this by merging 2 libs into one, making a “parent” Factory that does the check to where the request should go, and creating an instance of the required class. So now, each time the check is performed.