java.lang.IllegalStateException:Current user principal is not of type when i try to integrate keycloak with spring boot web + spring security project

Question

I Created a spring boot web project (.war) to be deployed in an application server.I want to integrate keycloak sso with spring security.The redirection to keycloak login page is working fine. But after that it is throwing error in browser.

Error which is getting thrown in browser

There was an unexpected error (type=Internal Server Error, status=500). Current user principal is not of type [org.keycloak.KeycloakPrincipal]: org.keycloak.adapters.springsecurity.token.KeycloakAuthenticationToken@450ca8a1: Principal: da02ad1b-32c1-4dde-a6f4-b56a06d7dc2e; Credentials: [PROTECTED]; Authenticated: true; Details: org.keycloak.adapters.springsecurity.account.SimpleKeycloakAccount@20e00226; Not granted any authorities

Error in application server console

2019-11-12 14:29:38.306 ERROR 6280 --- [nio-8089-exec-5] osbwservlet.support.ErrorPageFilter: Forwarding to error page from request [/] due to exception [Current user principal is not of type [org.keycloak.KeycloakPrincipal]: org.keycloak.adapters.springsecurity.token.KeycloakAuthenticationToken@f4a97409: Principal: da02ad1b-32c1-4dde-a6f4-b56a06d7dc2e; Credentials: [PROTECTED]; Authenticated: true; Details: org.keycloak.adapters.springsecurity.account.SimpleKeycloakAccount@11f292bf; Granted Authorities: KeycloakRole{role='user-premium'}, KeycloakRole{role='user'}]

java.lang.IllegalStateException: Current user principal is not of type [org.keycloak.KeycloakPrincipal]: org.keycloak.adapters.springsecurity.token.KeycloakAuthenticationToken@f4a97409: Principal: da02ad1b-32c1-4dde-a6f4-b56a06d7dc2e; Credentials: [PROTECTED]; Authenticated: true; Details: org.keycloak.adapters.springsecurity.account.SimpleKeycloakAccount@11f292bf; Granted Authorities: KeycloakRole{role='user-premium'}, KeycloakRole{role='user'} at org.springframework.web.servlet.mvc.method.annotation.ServletRequestMethodArgumentResolver.resolveArgument(ServletRequestMethodArgumentResolver.java:166) ~[spring-webmvc-5.1.6.RELEASE.jar:5.1.6.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.ServletRequestMethodArgumentResolver.resolveArgument(ServletRequestMethodArgumentResolver.java:121) ~[spring-webmvc-5.1.6.RELEASE.jar:5.1.6.RELEASE] at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:126) ~[spring-web-5.1.6.RELEASE.jar:5.1.6.RELEASE] at org.springframework.Z2567A5EC9705EB 7AC2C984033E06189DZ.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:166) ~[spring-web-5.1.6.RELEASE.jar:5.1.6.RELEASE]

Answer 1

exception [Current user principal is not of type [org.keycloak.KeycloakPrincipal]

you should use KeycloakAuthenticationToken instead of KeycloakPrincipal

Answer 2

Issue was like i used KeycloakPrincipal principal in contoller method