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Initially I have setup microservice application with oauth2 and keycloak.
I was able to do that successfully. I have added all things such as SECURITY_OAUTH2_CLIENT_ACCESS_TOKEN_URI, SECURITY_OAUTH2_CLIENT_USER_AUTHORIZATION_URI, SECURITY_OAUTH2_CLIENT_CLIENT_ID, SECURITY_OAUTH2_CLIENT_CLIENT_SECRET, SECURITY_OAUTH2_CLIENT_SCOPE, SECURITY_OAUTH2_RESOURCE_USER_INFO_URI. I have jhipster registry running and gateway application running. I have created a application in okta with the openidconnect type application. Screen shot is mentioned below. I able to see the http://localhost:8080. Upon clicking on sign in button I getting the below error.

If you look in your browser’s address bar on the 400 error page, you’ll see it has “http://localhost:8080/login” as the redirect URI. Add this value to the Login redirect URIs in your Okta app and you should be good to go.

Im sensing the problem is with authentication. I have created a user called admin in my okta developer account. In java logs i saw the below error

2018-11-12 10:51:02.720 DEBUG 29646 --- [ XNIO-2 task-13]
c.m.myapp.config.OAuth2Configuration : Saving login origin URI:
http://localhost:8080/ 2018-11-12 10:51:02.721 WARN 29646 --- [
XNIO-2 task-13] o.s.c.n.zuul.web.ZuulHandlerMapping : No routes
found from RouteLocator 2018-11-12 10:51:04.015 DEBUG 29646 --- [
XNIO-2 task-13] c.m.myapp.aop.logging.LoggingAspect : Enter:
com.mycompany.myapp.repository.CustomAuditEventRepository.add() with
argument[s] = [AuditEvent [timestamp=2018-11-12T05:21:04.014Z,
principal=0oahe7g64oGVGiok50h7, type=AUTHENTICATION_SUCCESS,
data=details=remoteAddress=0:0:0:0:0:0:0:1, sessionId=,
tokenType=BearertokenValue=]] Hibernate: insert into
jhi_persistent_audit_event (event_date, event_type, principal) values
(?, ?, ?) 2018-11-12 10:51:04.022 DEBUG 29646 --- [ XNIO-2 task-13]
c.m.myapp.aop.logging.LoggingAspect : Exit:
com.mycompany.myapp.repository.CustomAuditEventRepository.add() with
result = null Hibernate: insert into jhi_persistent_audit_evt_data
(event_id, name, value) values (?, ?, ?) 2018-11-12 10:51:04.029 DEBUG
29646 --- [ XNIO-2 task-13] m.m.s.OAuth2AuthenticationSuccessHandler :
Redirecting to saved login origin URI: http://localhost:8080/
2018-11-12 10:51:05.039 DEBUG 29646 --- [ XNIO-2 task-15]
c.m.myapp.aop.logging.LoggingAspect : Enter:
com.mycompany.myapp.repository.CustomAuditEventRepository.add() with
argument[s] = [AuditEvent [timestamp=2018-11-12T05:21:05.039Z,
principal=0oahe7g64oGVGiok50h7, type=AUTHORIZATION_FAILURE,
data=details=remoteAddress=0:0:0:0:0:0:0:1, sessionId=,
tokenType=BearertokenValue=,
type=org.springframework.security.access.AccessDeniedException,
message=Access is denied]] 2018-11-12 10:51:05.039 DEBUG 29646 --- [
XNIO-2 task-15] c.m.myapp.aop.logging.LoggingAspect : Exit:
com.mycompany.myapp.repository.CustomAuditEventRepository.add() with
result = null 2018-11-12 10:51:05.079 DEBUG 29646 --- [ XNIO-2
task-16] c.m.myapp.aop.logging.LoggingAspect : Enter:
com.mycompany.myapp.web.rest.AccountResource.getAccount() with
argument[s] =
[org.springframework.security.oauth2.provider.OAuth2Authentication@cf5e6315:
Principal: 0oahe7g64oGVGiok50h7; Credentials: [PROTECTED];
Authenticated: true; Details: remoteAddress=0:0:0:0:0:0:0:1,
sessionId=, tokenType=BearertokenValue=; Not granted
any authorities] 2018-11-12 10:51:05.081 DEBUG 29646 --- [ XNIO-2
task-16] c.m.myapp.aop.logging.LoggingAspect : Enter:
com.mycompany.myapp.service.UserService.getUserFromAuthentication()
with argument[s] =
[org.springframework.security.oauth2.provider.OAuth2Authentication@cf5e6315:
Principal: 0oahe7g64oGVGiok50h7; Credentials: [PROTECTED];
Authenticated: true; Details: remoteAddress=0:0:0:0:0:0:0:1,
sessionId=, tokenType=BearertokenValue=; Not granted
any authorities] 2018-11-12 10:51:05.082 ERROR 29646 --- [ XNIO-2
task-16] c.m.myapp.aop.logging.LoggingAspect : Exception in
com.mycompany.myapp.service.UserService.getUserFromAuthentication()
with cause = 'NULL' and exception = 'null'

java.lang.NullPointerException: null at
com.mycompany.myapp.service.UserService.getUserFromAuthentication(UserService.java:153)
at
com.mycompany.myapp.service.UserService$$FastClassBySpringCGLIB$$2169c3ce.invoke()
at
org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at
org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:746)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
at
org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:88)
at
com.mycompany.myapp.aop.logging.LoggingAspect.logAround(LoggingAspect.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498) at
org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:644)
at
org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:633)
at
org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:70)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at
org.springframework.aop.aspectj.AspectJAfterThrowingAdvice.invoke(AspectJAfterThrowingAdvice.java:62)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at
org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:294)
at
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at
org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at
org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688)
at
com.mycompany.myapp.service.UserService$$EnhancerBySpringCGLIB$$599f99c8.getUserFromAuthentication()
at
com.mycompany.myapp.web.rest.AccountResource.getAccount(AccountResource.java:59)
at
com.mycompany.myapp.web.rest.AccountResource$$FastClassBySpringCGLIB$$bb2cce5e.invoke()
at
org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at
org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:746)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
at
org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:88)
at
com.mycompany.myapp.aop.logging.LoggingAspect.logAround(LoggingAspect.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498) at
org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:644)
at
org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:633)
at
org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:70)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at
org.springframework.aop.aspectj.AspectJAfterThrowingAdvice.invoke(AspectJAfterThrowingAdvice.java:62)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at
org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at
com.ryantenney.metrics.spring.TimedMethodInterceptor.invoke(TimedMethodInterceptor.java:48)
at
com.ryantenney.metrics.spring.TimedMethodInterceptor.invoke(TimedMethodInterceptor.java:34)
at
com.ryantenney.metrics.spring.AbstractMetricMethodInterceptor.invoke(AbstractMetricMethodInterceptor.java:59)
at
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at
org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688)
at
com.mycompany.myapp.web.rest.AccountResource$$EnhancerBySpringCGLIB$$fc91dc3c.getAccount()
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498) at
org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209)
at
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)
at
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)
at
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:891)
at
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797)
at
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991)
at
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)
at
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974)
at
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:866)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687) at
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at
io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74)
at
io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)
at
com.codahale.metrics.servlet.AbstractInstrumentedFilter.doFilter(AbstractInstrumentedFilter.java:111)
at
io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at
io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101)
at
io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at
io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at

Thanks, I solved the issue. The solution was, The user with which i was trying to login was not created in users table. For that I have created another user in okta and assigned the roles to it. Reset the password and tried logging to account. Upon invoking "http://localhost:8080" and clicking on "sign in" button it redirected to okta login page and logged in with the above created user and it redirected me to home page of my gateway.

Thank you