Config error mystery

[Mark Fenbers]

Greetings,

I'm moving on from the tutorials and trying to setup an index for my own 
data (from a database).  All I did was add the following to the 
solrconfig.xml (taken verbatim from the example in Solr documentation, 
except for the name="config" pathname) and I get an error in the 
web-based UI.


  class="org.apache.solr.handler.dataimport.DataImportHandler" >


/localapps/dev/EventLog/data-config.xml

  

Because of this error, no /dataimport page is available in the Admin 
user interface; therefore, I cannot visit the page 
http://localhost:8983/solr/dataimport.  The actual error is:


org.apache.solr.common.SolrException: Error Instantiating 
requestHandler, org.apache.solr.handler.dataimport.DataImportHandler 
failed to instantiate org.apache.solr.request.SolrRequestHandler

at org.apache.solr.core.SolrCore.(SolrCore.java:820)
at org.apache.solr.core.SolrCore.(SolrCore.java:659)
at org.apache.solr.core.CoreContainer.create(CoreContainer.java:727)
at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:447)
at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:438)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at 
org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor$1.run(ExecutorUtil.java:210)
at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.solr.common.SolrException: Error Instantiating 
requestHandler, org.apache.solr.handler.dataimport.DataImportHandler 
failed to instantiate org.apache.solr.request.SolrRequestHandler

at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:588)
at org.apache.solr.core.PluginBag.createPlugin(PluginBag.java:122)
at org.apache.solr.core.PluginBag.init(PluginBag.java:217)
at 
org.apache.solr.core.RequestHandlers.initHandlersFromConfig(RequestHandlers.java:130)

at org.apache.solr.core.SolrCore.(SolrCore.java:773)
... 9 more
Caused by: java.lang.ClassCastException: class 
org.apache.solr.handler.dataimport.DataImportHandler

at java.lang.Class.asSubclass(Class.java:3208)
at 
org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:475)
at 
org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:422)

at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:567)
... 13 more


If I remove the  section and restart Solr, the error 
goes away.  As best I can tell, the contents of

/localapps/dev/EventLog/data-config.xml look fine, too.  See it here:


url="jdbc:postgresql://dx1f/OHRFC" user="awips" />


deltaQuery="SELECT posttime FROM eventlogtext WHERE 
lastmodtime > '${dataimporter.last_index_time}'">







It seems to me that this problem could be a classpath issue, but I 
copied the appropriate jar file into the solr/lib directory to be sure.  
This made the (slightly different) initial error go away, but now I 
cannot make this one go away.


Any ideas?

Mark

Re: Config error mystery

[Kevin Lee]

Are you using a single instance or cloud?  What version of Solr are you using?  
In your solrconfig.xml is the path to where you copied your library specified 
in a  tag?  Do you have a jar file for the Postgres JDBC driver in your 
lib directory as well?

For simple setup in 5.x I copy the jars to a lib directory under the 
core/collection directory.  For example, under server/solr//lib I 
would have the solr-dataimporthandler-.jar and the jdbc driver jar 
file.  These should be automatically picked up without having to add anything 
to the solrconfig.xml in terms of  tags.

For a production cloud deployment, I create a lib directory outside of the 
core/collection directory somewhere else on the file system so that it is easy 
to install without having to wait for a directory to be created by the 
Collections CREATE command and add the appropriate entry to the solrconfig.xml. 
 Then stick both jars in that directory.

Your error may be different, but as long as I have both jars in one of the two 
places mentioned above with the appropriate entry in solrconfig.xml if needed, 
then it has been working in my setups.

- Kevin


> On Sep 4, 2015, at 9:40 AM, Mark Fenbers  wrote:
> 
> Greetings,
> 
> I'm moving on from the tutorials and trying to setup an index for my own data 
> (from a database).  All I did was add the following to the solrconfig.xml 
> (taken verbatim from the example in Solr documentation, except for the 
> name="config" pathname) and I get an error in the web-based UI.
> 
>   class="org.apache.solr.handler.dataimport.DataImportHandler" >
>
>/localapps/dev/EventLog/data-config.xml
>
>  
> 
> Because of this error, no /dataimport page is available in the Admin user 
> interface; therefore, I cannot visit the page 
> http://localhost:8983/solr/dataimport.  The actual error is:
> 
> org.apache.solr.common.SolrException: Error Instantiating requestHandler, 
> org.apache.solr.handler.dataimport.DataImportHandler failed to instantiate 
> org.apache.solr.request.SolrRequestHandler
>at org.apache.solr.core.SolrCore.(SolrCore.java:820)
>at org.apache.solr.core.SolrCore.(SolrCore.java:659)
>at org.apache.solr.core.CoreContainer.create(CoreContainer.java:727)
>at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:447)
>at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:438)
>at java.util.concurrent.FutureTask.run(FutureTask.java:262)
>at 
> org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor$1.run(ExecutorUtil.java:210)
>at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>at java.lang.Thread.run(Thread.java:745)
> Caused by: org.apache.solr.common.SolrException: Error Instantiating 
> requestHandler, org.apache.solr.handler.dataimport.DataImportHandler failed 
> to instantiate org.apache.solr.request.SolrRequestHandler
>at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:588)
>at org.apache.solr.core.PluginBag.createPlugin(PluginBag.java:122)
>at org.apache.solr.core.PluginBag.init(PluginBag.java:217)
>at 
> org.apache.solr.core.RequestHandlers.initHandlersFromConfig(RequestHandlers.java:130)
>at org.apache.solr.core.SolrCore.(SolrCore.java:773)
>... 9 more
> Caused by: java.lang.ClassCastException: class 
> org.apache.solr.handler.dataimport.DataImportHandler
>at java.lang.Class.asSubclass(Class.java:3208)
>at 
> org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:475)
>at 
> org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:422)
>at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:567)
>... 13 more
> 
> 
> If I remove the  section and restart Solr, the error goes 
> away.  As best I can tell, the contents of
> /localapps/dev/EventLog/data-config.xml look fine, too.  See it here:
> 
> 
> url="jdbc:postgresql://dx1f/OHRFC" user="awips" />
>
>deltaQuery="SELECT posttime FROM eventlogtext WHERE 
> lastmodtime > '${dataimporter.last_index_time}'">
>
>
>
>
> 
> 
> It seems to me that this problem could be a classpath issue, but I copied the 
> appropriate jar file into the solr/lib directory to be sure.  This made the 
> (slightly different) initial error go away, but now I cannot make this one go 
> away.
> 
> Any ideas?
> 
> Mark
> 
> 
> 

Re: Config error mystery

[Shawn Heisey]

On 9/4/2015 10:40 AM, Mark Fenbers wrote:
> Caused by: java.lang.ClassCastException: class
> org.apache.solr.handler.dataimport.DataImportHandler
> at java.lang.Class.asSubclass(Class.java:3208) 

This is the root cause of your inability to create the dataimport
handler.  This is a different message than you would get if you had not
included the dataimport jar from the contrib directory, but it is related.

Chances are good that you have multiple versions of Solr jars on your
classpath and/or specified with  directives in solrconfig.xml.  It
may be a version mismatch between the dataimport jar and the other Solr
jars in the webapp and/or on the classpath.

Thanks,
Shawn