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https://issues.apache.org/jira/browse/NUTCH-1253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13248223#comment-13248223
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Ferdy Galema commented on NUTCH-1253:
-------------------------------------
Wow this issue keeps getting more and more interesting. I just found out that
the exception is CAUSED BY enabling trace logging. That is why it is so
confusing. My previous statement about it not affecting nutchgora is not true
it seems. It indeed affects both trunk and nutchgora. See the following
instructions for reproducing the problem:
ferdy@ftm:~/workspace/nutchtrunk/runtime/local$ bin/nutch parsechecker
"http://www.iana.org/";
...
Version: 5
Status: success(1,0)
...
Now what happens when I add the following line to log4j.properties. (Note that
the comment by Dennis has a type in this line).
log4j.logger.org.apache.nutch.parse.html=TRACE,cmdstdout
ferdy@ftm:~/workspace/nutchtrunk/runtime/local$ bin/nutch parsechecker
"http://www.iana.org/";
...
Version: 5
Status: failed(2,200): org.apache.nutch.parse.ParseException: Unable to
successfully parse content
...
So this is very obscure. It might be a trace logging statement that triggers
the exception. It cannot be something else.
> 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
> Attachments: NUTCH-1253-nutchgora.patch, NUTCH-1253.patch
>
>
> 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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