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Posted to dev@knox.apache.org by "Kevin Minder (JIRA)" <ji...@apache.org> on 2015/07/06 23:22:05 UTC
[jira] [Commented] (KNOX-564) NPE for Topology with no Providers
Confgured
[ https://issues.apache.org/jira/browse/KNOX-564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14615687#comment-14615687 ]
Kevin Minder commented on KNOX-564:
-----------------------------------
[~zacblanco] < This might be a good one for you to tackle.
> NPE for Topology with no Providers Confgured
> --------------------------------------------
>
> Key: KNOX-564
> URL: https://issues.apache.org/jira/browse/KNOX-564
> Project: Apache Knox
> Issue Type: Bug
> Reporter: Larry McCay
> Assignee: Larry McCay
> Fix For: 0.7.0
>
>
> Deploying a topology with no providers described in the gateway element succeeds. However, when attempting to access webhdfs through Knox for this topology we get a NPE:
> {code}
> <title>Error 500 Server Error</title>
> </head>
> <body><h2>HTTP ERROR 500</h2>
> <p>Problem accessing /gateway/cluster1/webhdfs/v1/.
> And the gateway.log file contains:
> 2015-07-03 00:09:04,560 ERROR hadoop.gateway (AbstractGatewayFilter.java:doFilter(69)) - Failed to execute filter: java.lang.NullPointerException
> 2015-07-03 00:09:04,560 ERROR hadoop.gateway (GatewayFilter.java:doFilter(135)) - 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$Holder.doFilter(GatewayFilter.java:315)
> at org.apache.hadoop.gateway.GatewayFilter$Chain.doFilter(GatewayFilter.java:215)
> at org.apache.hadoop.gateway.GatewayFilter.doFilter(GatewayFilter.java:129)
> at org.apache.hadoop.gateway.GatewayServlet.service(GatewayServlet.java:121)
> at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)
> at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501)
> at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
> at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
> at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
> at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
> at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
> at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
> at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
> at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
> at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
> at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
> at org.eclipse.jetty.server.Server.handle(Server.java:370)
> at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
> at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971)
> at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1033)
> at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)
> at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
> at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
> at org.eclipse.jetty.io.nio.SslConnection.handle(SslConnection.java:196)
> at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:667)
> at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
> at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
> at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.NullPointerException
> {code}
> As long as there are no default providers for each type, we should fail to deploy the topology with appropriate logging.
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