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https://issues.apache.org/jira/browse/NIFI-1752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15236007#comment-15236007
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James Wing commented on NIFI-1752:
----------------------------------
Not reliably, although it has seemed to fix both environments for long enough
to get my hopes up. Sometimes, after another restart, things go back to
failing, so maybe the synchronization is irrelevant or simply moves the timing
condition around. I'm going to add some logging and try to make sense of it.
> EvaluateXPath invalid when starting processor
> ---------------------------------------------
>
> Key: NIFI-1752
> URL: https://issues.apache.org/jira/browse/NIFI-1752
> Project: Apache NiFi
> Issue Type: Bug
> Components: Extensions
> Affects Versions: 0.6.0
> Reporter: Joseph Witt
>
> Guillaume Pool:
> Hi,
>
> If anyone could help I would appreciate it:
>
> After upgrading to 0.6.0 all my EvaluateXMLPath processors report as invalid
> with nothing specific reported as the error.
>
> I use flowfile attribute as the destination, xpath query similar to
> /message/address
>
> Return type auto-detect / string
>
> Error:
>
> 2016-04-11 17:37:12,465 INFO [NiFi Web Server-64629]
> org.apache.nifi.web.filter.RequestLogger Attempting request for (anonymous)
> PUT
> http://sv-hdpdf1.hdp.supergrp.net:8443/nifi-api/controller/process-groups/d02a0bbc-c142-37ba-adaa-ee191b98790d/processors/e49acf40-76d1-3b6e-a67d-dc40153605ad
> (source ip: 172.27.0.97)
> 2016-04-11 17:37:12,474 INFO [NiFi Web Server-64629]
> o.a.n.w.a.c.IllegalStateExceptionMapper java.lang.IllegalStateException:
> EvaluateXPath[id=e49acf40-76d1-3b6e-a67d-dc40153605ad] is not in a valid
> state. Returning Conflict response.
>
> Reports this even if you drop a new processor in.
> James Wing:
> I am able to see the same EvaluateXPath issue Guillame Pool reported on NiFi
> 0.6.0. I created a template gist at
> https://gist.github.com/jvwing/7e7948d8eb5ad3643f38966b4ba3ce2e that
> illustrates this for me. You don't even need to run the whole thing, just
> try to start the EvaluateXPath processor. I see a pop-up error trying to
> start it "EvaluateXPath[id=b481c570-686a-4b6e-859c-9ebe27398fe1] is not in a
> valid state".
> Trying to troubleshoot this, I attached a debugger and found an
> IllegalStateException thrown by StandardProcessorNode.verifyCanStart() on
> line 1141. The error text was:
> 'address' validated against '/message/address' is invalid because Unable to
> initialize XPath engine due to
> javax.xml.xpath.XPathFactoryConfigurationException: No XPathFactory
> implementation found for the object model: http://saxon.sf.net/jaxp/xpath/om
> I haven't figured out what change is the root cause, but the trail seems to
> lead into validating the dynamic XPath attribute.
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