if a 404 for a robots.txt is returned no page is fetched at all from the host
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Key: NUTCH-298
URL: http://issues.apache.org/jira/browse/NUTCH-298
Project: Nutch
Type: Bug
Reporter: Stefan Groschupf
Fix For: 0.8-dev
What happen:
Is no RobotRuleSet is in the cache for a host, we create try to fetch the
robots.txt.
In case http response code is not 200 or 403 but for example 404 we do "
robotRules = EMPTY_RULES; " (line: 402)
EMPTY_RULES is a RobotRuleSet created with the default constructor.
tmpEntries and entries is null and will never changed.
If we now try to fetch a page from the host that use the EMPTY_RULES is used
and we call isAllowed in the RobotRuleSet.
In this case a NPE is thrown in this line:
if (entries == null) {
entries= new RobotsEntry[tmpEntries.size()];
possible Solution:
We can intialize the tmpEntries by default and also remove other null checks
and initialisations.
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