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https://issues.apache.org/jira/browse/NUTCH-1253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13193042#comment-13193042
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Ferdy Galema commented on NUTCH-1253:
-------------------------------------
Hi,
Looking at the revision history it seems that 3 years ago the library actually
WAS updated to 1.9.11, whereafter a few months later is was reverted to 0.9.4
and later on to 0.9.5 but the plugin version remained at 1.9.11. The fact that
they bothered to change this version number in the first place is pretty
curious in itself, because most plugins simply remain at version 1.0 despite
several changes. Not that it matters, but just to indicate that this number has
no real purpose. As to nekohtml jar, am not sure why it's still at this
specific version, or why it is the preferred setting. Digging up the issues or
mailing lists might give you some more info about this. It might be worth
looking into tagsoup.
I do find your AbstractMethodError curious though. Are you sure it's because of
nekohtml and xerces? Can you provide a stracktrace?
> Incompatible neko and xerces versions
> -------------------------------------
>
> Key: NUTCH-1253
> URL: https://issues.apache.org/jira/browse/NUTCH-1253
> Project: Nutch
> Issue Type: Bug
> Affects Versions: 1.4
> Environment: Ubuntu 10.04
> Reporter: Dennis Spathis
>
> The Nutch 1.4 distribution includes
> - nekohtml-0.9.5.jar (under .../runtime/local/plugins/lib-
> nekohtml)
> - xercesImpl-2.9.1.jar (under .../runtime/local/lib)
> These two JARs appear to be incompatible versions. When the HtmlParser
> (configured to use neko) is invoked during a local-mode crawl, the parse
> fails due to an AbstractMethodError. (Note: To see the AbstractMethodError,
> rebuild the HtmlParser plugin and add a
> catch(Throwable) clause in the getParse method to log the stacktrace.)
> I found that substituting a later, compatible version of nekohtml (1.9.11)
> fixes the problem.
> Curiously, and in support of the above, the nekohtml plugin.xml file in
> Nutch 1.4 contains the following:
> <plugin
> id="lib-nekohtml"
> name="CyberNeko HTML Parser"
> version="1.9.11"
> provider-name="org.cyberneko">
> <runtime>
> <library name="nekohtml-0.9.5.jar">
> <export name="*"/>
> </library>
> </runtime>
> </plugin>
> Note the conflicting version numbers (version tag is "1.9.11" but the
> specified library is "nekohtml-0.9.5.jar").
> Was the 0.9.5 version included by mistake? Was the intention rather to
> include 1.9.11?
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