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From "Guillaume Pool (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NIFI-1752) EvaluateXPath invalid when starting processor
Date Wed, 13 Apr 2016 10:55:25 GMT

    [ https://issues.apache.org/jira/browse/NIFI-1752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15239066#comment-15239066
] 

Guillaume Pool commented on NIFI-1752:
--------------------------------------

Thanks

> 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
>             Fix For: 0.7.0
>
>
> 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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