[Nutch Wiki] Update of "ErrorMessages" by ChiragChaman

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The following page has been changed by ChiragChaman:
http://wiki.apache.org/nutch/ErrorMessages

New page:

= Error messages, reasons and solutions =

Please feel free to add error messages, reasons and solutions!

Please report bugs to the mailing list!

  * Fetching
  * Updating
  * Searching

== Errors Fetching ==

'''Why do I get error "123456 104934 fetch of http://mydomain/index.html failed with: net.nutch.net.protocols.http.HttpError: HTTP Error: 401" when crawling?'''
  * An HTTP 401 error is returned from a remote webserver when you not authorized to view the page. Currently nutch does not support HTTP authentication but it will be trivial to add when the new HTTPClient fetcher code is committed.

'''/etc/host.conf: line 1: cannot specify more then 4 services'''
  * Please have a look at http://sources.redhat.com/ml/bug-glibc/2002-07/msg00269.html

== Errors Updating ==

'''Until updating my DB I got a OutOfMemoryException or a 'to many files open' error.'''
  * The problems is that nutch opens more files then your OS allows to open. You can check the limits of your machine with "ulimit -a". In case you run nutch as superuser you can set the limit of open files for the actual session with "ulimit -n 65536". To change this limit permanently please read: http://bbcr.uwaterloo.ca/~brecht/servers/openfiles.html

== Errors Searching ==

'''Tomcat reports root cause: java.lang.OutOfMemoryError and does not find anything.'''
  * Try to give java / tomcat some more memory. Add to catalina.sh (linux): JAVA_OPTS=-Xmx256m

== Errors installing ==

See GettingNutchRunningOnDebian for some help.