[ http://issues.apache.org/jira/browse/NUTCH-298?page=all ]
Stefan Groschupf updated NUTCH-298:
-----------------------------------
Attachment: fixNpeRobotRuleSet.patch
fix the npe in RobotRuleSet happen in case we use a empthy RuleSet
> if a 404 for a robots.txt is returned no page is fetched at all from the host
> -----------------------------------------------------------------------------
>
> Key: NUTCH-298
> URL: http://issues.apache.org/jira/browse/NUTCH-298
> Project: Nutch
> Type: Bug
> Reporter: Stefan Groschupf
> Fix For: 0.8-dev
> Attachments: fixNpeRobotRuleSet.patch
>
> 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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