org.apache.solr.client.solrj.beans.BindingException - solr

Question

I have the below bean class for defining my solrInputDocument
public class VenueDocumentSolr extends SolrInputDocument {
#Field
private int id;
#Field
private String uid;
...
}
And I try to get the results using the below code:
SolrQuery query = new SolrQuery();
query.setQuery(SearchForRestaurants);
QueryResponse rsp = SolrUtil.issueSolrQuery(query);
for (SolrDocument s : rsp.getResults())
System.out.println(s);
List<VenueDocumentSolr> beans = rsp.getBeans(VenueDocumentSolr.class);
the above code works sometimes and throws the below Exception rest of the time.
I cross checked and added missing fields to my bean class. But of no use. I still get the error :(
org.apache.solr.client.solrj.beans.BindingException: Could not instantiate object of class com.zvents.common.entities.solr.VenueDocumentSolr
at org.apache.solr.client.solrj.beans.DocumentObjectBinder.getBean(DocumentObjectBinder.java:68)
at org.apache.solr.client.solrj.beans.DocumentObjectBinder.getBeans(DocumentObjectBinder.java:47)
at org.apache.solr.client.solrj.response.QueryResponse.getBeans(QueryResponse.java:480)
at com.zvents.webapp.api.DeleteData.QueryAndUpdateVenuesForSearch(DeleteData.java:117)
.........
Quoting a part of the Schema
<int name="has_images">*</int>
<arr name="cuisine">
<str>*</str>
</arr>
<arr name="venue_type">
<int>*</int>
</arr>
<double name="location_0_latLon">*</double>
<float name="venue_imp">*</float>
<date name="last_indexed">*</date>
Quoting applicable fields from bean class
#Field
private int has_images;
#Field
private List<String> cuisine;
#Field
private List<Integer> venue_type;
#Field
private double location_0_latLon;
#Field
private float venue_imp;
#Field
private String last_indexed;

Answer 1

I did it in following way:
DocumentObjectBinder binder = new DocumentObjectBinder();
beanlist = binder.getBeans(PortalBean.class, list);
package hello;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.apache.solr.client.solrj.SolrClient;
import org.apache.solr.client.solrj.SolrQuery;
import org.apache.solr.client.solrj.SolrServerException;
import org.apache.solr.client.solrj.beans.DocumentObjectBinder;
import org.apache.solr.client.solrj.impl.HttpSolrClient;
import org.apache.solr.client.solrj.response.QueryResponse;
import org.apache.solr.common.SolrDocument;
import org.apache.solr.common.SolrDocumentList;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
#RestController
public class SearchOnNameController {
#CrossOrigin(origins = "*")
#RequestMapping("search")
public List<PortalBean> searchName(#RequestParam(value = "query", defaultValue = "*") String name) {
String urlString = "http://localhost:8983/solr/kislay";
SolrClient solr = new HttpSolrClient(urlString);
SolrQuery query = new SolrQuery();
// query.addField("name");
query.setQuery("name:" + "*" + name + "*");
PortalBean bean = null;
List<PortalBean> beanlist = new ArrayList<PortalBean>();
try {
QueryResponse response = solr.query(query);
SolrDocumentList list = response.getResults();
DocumentObjectBinder binder = new DocumentObjectBinder();
beanlist = binder.getBeans(PortalBean.class, list);
} catch (SolrServerException | IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return beanlist;
}
}
The bean is mapped as :
package hello;
import org.apache.lucene.document.TextField;
import org.apache.solr.client.solrj.beans.Field;
import org.apache.solr.schema.StrField;
public class PortalBean {
private String id;
private String name;
private String image;
private String description;
private String branding;
private double rating;
private double setup_fee;
private String transaction_fees;
private String how_to_url;
private String [] currencies;
public String getId() {
return id;
}
#Field("id")
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
#Field("name")
public void setName(String name) {
this.name = name;
}
public String getImage() {
return image;
}
#Field("image")
public void setImage(String image) {
this.image = image;
}
public String getDescription() {
return description;
}
#Field("description")
public void setDescription(String description) {
this.description = description;
}
public String getBranding() {
return branding;
}
#Field("branding")
public void setBranding(String branding) {
this.branding = branding;
}
public double getRating() {
return rating;
}
#Field("rating")
public void setRating(double rating) {
this.rating = rating;
}
public double getSetup_fee() {
return setup_fee;
}
#Field("setup_fee")
public void setSetup_fee(double setup_fee) {
this.setup_fee = setup_fee;
}
public String getTransaction_fees() {
return transaction_fees;
}
#Field("transaction_fees")
public void setTransaction_fees(String transaction_fees) {
this.transaction_fees = transaction_fees;
}
public String getHow_to_url() {
return how_to_url;
}
#Field("how_to_url")
public void setHow_to_url(String how_to_url) {
this.how_to_url = how_to_url;
}
public String [] getCurrencies() {
return currencies;
}
#Field("currencies")
public void setCurrencies(String [] currencies) {
this.currencies = currencies;
}
}
Also please note that managed-schema file need to have proper definition of the fields:
example as per my use case:
<field name="branding" type="string"/>
<field name="currencies" type="strings"/>
<field name="description" type="string"/>
<field name="how_to_url" type="string"/>
<field name="id" type="string" multiValued="false" indexed="true" required="true" stored="true"/>
<field name="image" type="string"/>
<field name="name" type="string"/>
<field name="rating" type="tdouble"/>
<field name="setup_fee" type="tdouble"/>
<field name="transaction_fee" type="string"/>

Answer 2

Unfortunately you do not post all of your pojo and all of your schema, so I can only guess.
The only thing I see, from the code you posted is that you are trying to let solr do some sort of conversion for you.
That is for
#Field
private String last_indexed;
And
<date name="last_indexed">*</date>
Solr will not convert a Date to a String for you, just will not. But without a full schema and the full code of your Bean, I cannot give you a full answer.
Other things I noted from the code you post
why are you putting * within the elements of your schema as far as I know that does not have any effect
why are you extending SolrInputDocument? You do not need to. #Field is designed so that you do not need to subclass anything, but may use your model's POJOs right away.

Answer 3

My error was: BindingException: Could not instantiate object
I added a no variable constructor to the POJO and it started to work.
public class MyItem {
String id;
#Field("id")
public void setId(String id) {
this.id = id;
}
public String getId() {
return id;
}
public MyItem() {
}
}
To get to here the only fields in my schema were:
<field name="_version_" type="long" indexed="true" stored="true"/>
<field name="_root_" type="string" indexed="true" stored="false"/>
<field name="id" type="string" indexed="true" stored="true" required="true" multiValued="false" />
<field name="text" type="string" indexed="true" stored="false" multiValued="true"/>
<uniqueKey>id</uniqueKey>
This is the code to dump the ids in the solr.
private void dumpSolr2() throws SolrServerException {
System.out.println("dumpSolr2");
SolrQuery query = new SolrQuery();
query.setQuery( "*:*" ); // get all
query.setFields("id"); // get the id field
query.setStart(0); // row to start on. First row is 0.
query.setRows(10); // number of rows to get at a time.
System.out.println(query.toString());
QueryResponse rsp = _solr.query( query );
List<BulkLoad1Data> bulkLoad1DataList = rsp.getBeans(BulkLoad1Data.class);
RplHelper1.rplSay("bulkLoad1DataList.size(): " + bulkLoad1DataList.size());
int count = 0;
Iterator<BulkLoad1Data> i = bulkLoad1DataList.iterator();
while (i.hasNext()) {
BulkLoad1Data bld = (BulkLoad1Data) i.next();
RplHelper1.rplSay("dumpSolr2 - count: " + ++count + " " +
" id: " + bld.getId());
}
}