[KNOX-722] Null Pointer Exception while accessing Services via Knox SSO configured for OKTA

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 0.9.0
• Fix Version/s: 0.9.1
• Component/s: Server
• Labels: features
• Environment: All
• Flags: Important
• Assignee: Larry McCay
• Reporter: Krishna Pandey
• Created: 13/Jul/16 03:22
• Updated: 28/Mar/19 14:15
• Resolved: 14/Jul/16 21:20

Description

When trying to access services e.g. Ranger using Knox Single Sign-On configured for Okta, we are getting HTTP 500 Error. Error is caused due to Null Pointer Exception which can be seen in gateway.log, relevant log below:

2016-07-12 21:24:11,131 ERROR hadoop.gateway (AbstractGatewayFilter.java:doFilter(69)) - Failed to execute filter: java.lang.NullPointerException
2016-07-12 21:24:11,132 ERROR hadoop.gateway (GatewayFilter.java:doFilter(145)) - Gateway processing failed: javax.servlet.ServletException: java.lang.NullPointerException
javax.servlet.ServletException: java.lang.NullPointerException
        at org.apache.hadoop.gateway.filter.AbstractGatewayFilter.doFilter(AbstractGatewayFilter.java:70)
        at org.apache.hadoop.gateway.GatewayFilter$Holder.doFilter(GatewayFilter.java:332)
        at org.apache.hadoop.gateway.GatewayFilter$Chain.doFilter(GatewayFilter.java:232)
        at org.apache.hadoop.gateway.GatewayFilter.doFilter(GatewayFilter.java:139)
        at org.apache.hadoop.gateway.GatewayFilter.doFilter(GatewayFilter.java:91)
        at org.apache.hadoop.gateway.GatewayServlet.service(GatewayServlet.java:138)
        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
        at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
        at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
        at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
        at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
        at org.apache.hadoop.gateway.trace.TraceHandler.handle(TraceHandler.java:51)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
        at org.apache.hadoop.gateway.filter.CorrelationHandler.handle(CorrelationHandler.java:39)
        at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
        at org.eclipse.jetty.server.Server.handle(Server.java:499)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
        at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
        at org.apache.hadoop.gateway.pac4j.filter.Pac4jDispatcherFilter.doFilter(Pac4jDispatcherFilter.java:209)
        at org.apache.hadoop.gateway.GatewayFilter$Holder.doFilter(GatewayFilter.java:332)
        at org.apache.hadoop.gateway.GatewayFilter$Chain.doFilter(GatewayFilter.java:232)
        at org.apache.hadoop.gateway.filter.XForwardedHeaderFilter.doFilter(XForwardedHeaderFilter.java:30)