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From Jason Gerlowski <gerlowsk...@gmail.com>
Subject Re: Java object binding not working
Date Fri, 08 Feb 2019 22:49:09 GMT
Hi Swapnil,

Ray did suggest a potential cause.  Your Java object has "name" as a
String, but Solr returns the "name" value as an ArrayList<String>.
Usually Solr returns ArrayLists when the field in question is
multivalued, so it's a safe bet that Solr is treating your "name"
field as multivalued.

You can check this by opening Solr's admin UI, selecting your
collection from the collection dropdown menu, and clicking on the
Schema tab.  In the "Schema" window you can select your "name" field
from the dropdown and see if the table that appears shows it as
"multivalued".

If the field is multivalued, you've got a few options:
- you can start fresh with a new collection, and modify your schema so
that "name" is single-valued
- you can try to change the field-definition in place.  I'm not sure
whether Solr will allow this, but the API to try is here:
https://lucene.apache.org/solr/guide/7_6/schema-api.html#replace-a-field
- you can just change your Java object to represent "name" as a
List<String> instead of a String.

If the field _isn't_ multivalued, then I'm not sure what's going on.

Best,

Jason

On Fri, Feb 8, 2019 at 1:40 PM Swapnil Katkar <skatkar225@gmail.com> wrote:
>
> Hi,
>
> It would be beneficial to me if you provide me at least some hint to
> resolve this problem. Thanks in advance!
>
> Regards,
> Swapnil Katkar
>
>
>
> ---------- Forwarded message ---------
> From: Swapnil Katkar <skatkar225@gmail.com>
> Date: Tue, Feb 5, 2019 at 10:58 PM
> Subject: Fwd: Java object binding not working
> To: <solr-user@lucene.apache.org>
>
>
> Hello,
>
> Could you please let me know how can I get the resolution of the mentioned
> issue?
>
> Regards,
> Swapnil Katkar
>
> ---------- Forwarded message ---------
> From: Swapnil Katkar <skatkar225@gmail.com>
> Date: Sun, Feb 3, 2019, 17:31
> Subject: Java object binding not working
> To: <solr-user@lucene.apache.org>
>
>
> Greetings!
>
> I am working on a requirement where I want to query the data and want to do
> the object mapping for the retrieved result using Solrj. For this, I am
> referring to the official document at
> *https://lucene.apache.org/solr/guide/7_6/using-solrj.html#java-object-binding
> <https://lucene.apache.org/solr/guide/7_6/using-solrj.html#java-object-binding>.*
> I
> set-up the necessary class files and the collections.
>
> With the help of this document, I can create the documents in the Solr DB,
> but it is not working for fetching and mapping the fields to the Java POJO
> class. To do the mapping, I used @Field annotation.
>
> Details are as below:
> *1)* Solrj version: 7.6.0
> *2)* The line of code which is not working: *List<Employee> employees =
> response.getBeans(Employee.class);*
> *3)* Exception stack trace:
> *Caused by: java.lang.IllegalArgumentException: Can not set
> java.lang.String field demo.apache.solr.vo.Employee.name
> <http://demo.apache.solr.vo.Employee.name> to java.util.ArrayList*
> * at
> sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(Unknown
> Source)*
> * at
> sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(Unknown
> Source)*
> * at sun.reflect.UnsafeObjectFieldAccessorImpl.set(Unknown Source)*
> * at java.lang.reflect.Field.set(Unknown Source)*
> *4)* Collection was created using
>         *solr.cmd create -c employees -s 2 -rf 2*
>
> Please find the attached source code files. Also, I attached the stack
> trace file. Can you please help me on how to resolve them?
>
> Regards,
> Swapnil Katkar
>
>
> --
> Hello,
>
>
> Regards,
> Swapnil Katkar

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