Larry McCay created KNOX-564:
--------------------------------
Summary: 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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