[NUTCH-2154] Nutch REST API (DB) suffering NullPointerException

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.11
• Fix Version/s: 1.11
• Component/s: REST_api
• Labels: memex
• Assignee: Chris A. Mattmann
• Reporter: Aron Ahmadia
• Created: 28/Oct/15 17:21
• Updated: 13/Mar/24 14:51
• Resolved: 30/Oct/15 23:55

Description

Not sure what's causing this. I tried this request both before and after a crawl had completed.

nutch.py: POST Endpoint: /db/crawldb
nutch.py: POST Request data:

{'type': 'stats', 'crawlId': 'crawl_aahmadia_2015-10-28T13_17_15.034351', 'confId': 'default'}

nutch.py: POST Request headers:

{'Accept': 'application/json'}

nutch.py: Response headers:

{'Date': 'Wed, 28 Oct 2015 17:18:54 GMT', 'Content-Length': '0', 'Server': 'Jetty(8.1.15.v20140411)'}

nutch.py: Response status: 500

nutch log:

java.lang.NullPointerException
at org.apache.nutch.crawl.CrawlDbReader.query(CrawlDbReader.java:747)
at org.apache.nutch.service.resources.DbResource.crawlDbStats(DbResource.java:95)
at org.apache.nutch.service.resources.DbResource.readdb(DbResource.java:52)
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:497)
at org.apache.cxf.service.invoker.AbstractInvoker.performInvocation(AbstractInvoker.java:181)
at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:97)
at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:200)
at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:99)
at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:59)
at org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:96)
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:307)
at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121)
at org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:251)
at org.apache.cxf.transport.http_jetty.JettyHTTPDestination.doService(JettyHTTPDestination.java:261)
at org.apache.cxf.transport.http_jetty.JettyHTTPHandler.handle(JettyHTTPHandler.java:70)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1088)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1024)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.Server.handle(Server.java:370)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:982)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1043)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:53)
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)