关于如何使用无密码代码（取自 API 端点“/api/passwordless/start”）并使用它在前端重定向用户的任何建议？
我认为这会起作用，但它没有：
- 来自 API 端点“/api/passwordless/start”的请求代码
- 来自 API 端点的回复：“JriRpuGHmecXAD2qRB3_s-Ud4jMKxmtuD57bfYAjYn4”
- 打开/重定向到 URL：http://localhost:9011/oauth2/passwordless/JriRpuGHmecXAD2qRB3_s-Ud4jMKxmtuD57bfYAjYn4?tenantId=57810835-47f7-683f-02ed-420592eface2
相反，我收到此错误：
Jan 23, 2020 9:21:27.276 AM ERROR io.fusionauth.app.primeframework.error.ExceptionExceptionHandler - An unhandled exception was thrown
java.lang.NullPointerException: null
at io.fusionauth.app.action.oauth2.BaseOAuthAction.handleInteractiveLoginResponse(BaseOAuthAction.java:391)
at io.fusionauth.app.action.oauth2.PasswordlessAction.authenticateAuthorizationGrant(PasswordlessAction.java:135)
at io.fusionauth.app.action.oauth2.PasswordlessAction.get(PasswordlessAction.java:50)
at sun.reflect.GeneratedMethodAccessor90.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.primeframework.mvc.util.ReflectionUtils.invoke(ReflectionUtils.java:414)
at org.primeframework.mvc.action.DefaultActionInvocationWorkflow.execute(DefaultActionInvocationWorkflow.java:79)
at org.primeframework.mvc.action.DefaultActionInvocationWorkflow.perform(DefaultActionInvocationWorkflow.java:62)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.validation.DefaultValidationWorkflow.perform(DefaultValidationWorkflow.java:47)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.security.DefaultSecurityWorkflow.perform(DefaultSecurityWorkflow.java:60)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.parameter.DefaultPostParameterWorkflow.perform(DefaultPostParameterWorkflow.java:50)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.content.DefaultContentWorkflow.perform(DefaultContentWorkflow.java:52)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.parameter.DefaultParameterWorkflow.perform(DefaultParameterWorkflow.java:57)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.parameter.DefaultURIParameterWorkflow.perform(DefaultURIParameterWorkflow.java:102)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.scope.DefaultScopeRetrievalWorkflow.perform(DefaultScopeRetrievalWorkflow.java:58)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.message.DefaultMessageWorkflow.perform(DefaultMessageWorkflow.java:45)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at io.fusionauth.app.primeframework.FrontEndTenantWorkflow.perform(FrontEndTenantWorkflow.java:76)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.action.DefaultActionMappingWorkflow.perform(DefaultActionMappingWorkflow.java:126)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.workflow.StaticResourceWorkflow.perform(StaticResourceWorkflow.java:97)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.parameter.RequestBodyWorkflow.perform(RequestBodyWorkflow.java:89)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.security.DefaultSavedRequestWorkflow.perform(DefaultSavedRequestWorkflow.java:57)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at io.fusionauth.app.primeframework.CORSFilter.handleNonCORS(CORSFilter.java:291)
at io.fusionauth.app.primeframework.CORSFilter.doFilter(CORSFilter.java:252)
at io.fusionauth.app.primeframework.CORSRequestWorkflow.perform(CORSRequestWorkflow.java:48)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at io.fusionauth.app.primeframework.FusionAuthMVCWorkflow.perform(FusionAuthMVCWorkflow.java:88)
at org.primeframework.mvc.workflow.DefaultWorkflowChain.continueWorkflow(DefaultWorkflowChain.java:44)
at org.primeframework.mvc.servlet.FilterWorkflowChain.continueWorkflow(FilterWorkflowChain.java:50)
at org.primeframework.mvc.servlet.PrimeFilter.doFilter(PrimeFilter.java:84)
at com.inversoft.maintenance.servlet.MaintenanceModePrimeFilter.doFilter(MaintenanceModePrimeFilter.java:59)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.inversoft.servlet.UTF8Filter.doFilter(UTF8Filter.java:27)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:798)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:808)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
注意：通过电子邮件发送的无密码登录有效。