I try to use solr 6.5.0 to connect java . I have added following .jar files to the library:
commons-io-2.5
httpclient-4.4.1
httpcore-4.4.1
httpmine-4.4.1
jcl-over-slf4j-1.7.7
noggit-0.6
slf4j-api-1.7.7
stax2-api-3.1.4
woodstox-core-asl-4.4.1
zookeeper-3.4.6
solr-solrj-6.5.0
but when i try use following code to connect the solr:
import org.apache.http.impl.bootstrap.HttpServer;
import org.apache.solr.client.solrj.SolrQuery;
import org.apache.solr.client.solrj.SolrServerException;
import org.apache.solr.client.solrj.impl.HttpSolrServer;
import org.apache.solr.client.solrj.response.QueryResponse;
import org.apache.solr.common.SolrDocumentList;
public class SolrQuery {
public static void main(String[] args) throws SolrServerException {
HttpSolrServer solr = new HttpServer("http://localhost:8983/solr/collection1");
SolrQuery query = new SolrQuery();
query.setQuery("*");
QueryResponse response = solr.query(query);
SolrDocumentList results = response.getResults();
for (int i = 0; i < results.size(); ++i) {
System.out.println(results.get(i));
}
}
}
before i compile it, I got an error in the:
import org.apache.solr.client.solrj.impl.HttpSolrServer;
import org.apache.solr.client.solrj.SolrQuery;
HttpSolrServer solr = new HttpServer("http://localhost:8983/solr/collection1");
Can anyone help me how to solve it?
The piece of code in your question was written for an old version of Solr before ver. 5.0. You'll find many sources and example around written for old Solr versions, but in most of the cases all you have to do is change the old SolrServer class with the new SolrClient (and now correct) class.
Both were the representations of the Solr instances you want to use.
Read the Solr Documentation - Using SolrJ
I warmly suggest to not use for your classes the same name of an already existing class (in your example your class is named SolrQuery).
The catch all string for Solr queries is *:* which means: search any match for all available fields. So change the statement query.setQuery into:
query.setQuery("*:*");
I suppose you're using a Solr client for a standalone instance so, as you're already aware, the correct way to instance a SolrClient is:
String urlString = "http://localhost:8983/solr/gettingstarted";
SolrClient solr = new HttpSolrClient.Builder(urlString).build();
And this is an easier way I suggest to iterate through all returned document:
for (SolrDocument doc : response.getResults()) {
System.out.println(doc);
}
Have a look at the documentation of SolrDocument class that explain how to use it and correctly read field values.
I founded that i need to import a .jar file which is not contain in the /dist library which named slf4j-simple-1.7.25 , and also
HttpSolrServer solr = new HttpServer("http://localhost:8983/solr/gettingstarted");
SolrQuery query = new SolrQuery();
need to change to the
String urlString = "http://localhost:8983/solr/gettingstarted";
SolrClient solr = new HttpSolrClient.Builder(urlString).build();
after that it finally can run already!!!
Related
So starting to update ancient solr app to 9.1 and also the SolrJ indexer. When I try to add a document, I am getting
Exception in thread "main" org.apache.solr.client.solrj.impl.BaseHttpSolrClient$RemoteSolrException: Error from server at http://my.host:8983/solr/qmap:
Searching for Solr
You must type the correct path
Solr will respond
I can see the qmap core in the solr admin and solr is running.
Code is:
public class DocumentIndexer {
private final String fileToIndex;
private final ConcurrentUpdateHttp2SolrClient solrClient;
private final Http2SolrClient http2Client;
public DocumentIndexer(String solrUrl, String fileToIndex) {
this.fileToIndex =fileToIndex;
http2Client = new Http2SolrClient.Builder().build();
solrClient = new ConcurrentUpdateHttp2SolrClient.Builder(solrUrl, http2Client).build();
}
public void indexDocuments() throws IOException, SolrServerException{
ContentStreamUpdateRequest req = new ContentStreamUpdateRequest("/update/extract");
req.setAction(AbstractUpdateRequest.ACTION.COMMIT, true, true);
req.addFile(new File(fileToIndex),"application/xml");
req.setParam("id", fileToIndex);
req.process(solrClient);
solrClient.commit(true, true);
}
}
Simple enough - update/extract was not defined in the solrconfig. Recreating the core using the sample_techproducts_examples as template supplies this or alternatively setting up the solrconfig with the update/extract path defined.
Also, req.setParam("id", fileToIndex) needs to be changed to req.setParam("literal.id", fileToIndex)
I am trying to implement a simple custom request handler in Solr 7.3. I needed some clarifications on the methods available via the Solr Java API.
As per my understanding, I have extended my Java Class with "SearchHandler" and then overridden the "handleRequestBody" method. I am trying to understand the flow from the beginning. Here is a sample query in the browser.
http://localhost:8983/solr/customcollection/customhandler?
q=John&fl=id,last_name&maxRows=10
1) Once you enter the above query in the browser and press
"return" the Solr customhandler will be triggered. It will look
for the necessary jars from where the handler is created.
2) Once it finds the main class it will execute the following
method, which is overridden from the "SearchHandler" parent
class.
public void handleRequestBody(SolrRequest req, SolrResponse
resp) throws Exception
3) The SolrRequest req object will hold all the Solr Parameters
on the query, in this case, q,fl and maxRows.
4) Using the following code I unpack these parameters.
SolrParams params = req.getParams();
String q = params.get(CommonParams.Q);
String fl = params.getParams(CommonParams.FL);
String rows = params.get(CommonParams.ROWS);
5)I create a Solr object that let's me connect to my Solr Cloud
String zkHostString = "localhost:5181";
SolrClient solr = new
CloudSolrClient.Builder().withZkHost(zkHostString).build();
6) Here is where I need help
a) How do I use the unpacked Solr Parameters from the
original query and make a call to the "solr" object to
return results.
b) How do I make use of the "resp" object?
c) Most of the examples that I found on the internet show
how to print the results to STDOUT. However, since I am
using a custom handler I would like to display the results
back to the user (in this case, SOLR Admin or the browser).```
Any help is truly appreciated.
Thanks
public class SolrQueryTest extends
org.apache.solr.handler.component.SearchHandler {
String zkHostString = "localhost:5181";
SolrClient solr = new
CloudSolrClient.Builder().withZkHost(zkHostString).build();
private static final Logger log =
Logger.getLogger(SolrQueryTest.class.getName());
public void handleRequestBody(SolrRequest req, SolrResponse
resp) throws Exception {
SolrParams params = req.getParams();
String q = params.get(CommonParams.Q);
String rows = params.get(CommonParams.ROWS);
SolrQuery query = new SolrQuery(q);
query.setShowDebugInfo(true);
query.set("indent", "true");
// need to know how to call SOLR using the above query
parameters
//Once the response is received how to send it back to the
browser and NOT STDOUT
}
}
Solr version :: 6.6.1
SolrNet API with the C# based application
I wish to invoke or trigger the data import handler from the C# code with
the help of SolrNet. But i am unable to locate any tutorial in the SolrNet
API. I can easily invoke the DIH from the solr admin UI, but my need is to invoke it from an external application.
Please suggest the code snippet how do i invoke the data import action from the C# based
application ?
I don't think it's possible to do completely from Solr.NET, a brief look gives me an idea, that currently there is only class responsible for DIH status page, which is good, but not covering the initial process. I think this was discarded recently, since this functionality wasn't needed.
In the SolrBasicServer class you have:
public SolrDIHStatus GetDIHStatus(KeyValuePair<string, string> options) {
var response = connection.Get("/dataimport", null);
var dihstatus = XDocument.Parse(response);
return dihStatusParser.Parse(dihstatus);
}
which is getting the DIH. Most likely, you need to extend this class and do something similar (I'm not C# developer, so not 100% sure about the code):
connection.Post("/dataimport?command=full-import", null);
or something similar with delta-import command and then later get the status part.
If updating Solr.NET is not the case for you, you still could just trigger it via usual HTTP call with some preferable C# library and do POST request to http://host:port/solr/collection-name/dataimport?command=full-import
string solrTargetDIHUrl = "http://localhost:8983/solr/dih/dataimport?command=delta-import";
try
{
using (var solrClient = new HttpClient())
{
var resultObj = solrClient.GetAsync(new Uri(solrTargetDIHUrl)).Result;
Console.ForegroundColor = ConsoleColor.Green;
Console.WriteLine("\t\t Data Import Triggered Successfully !");
Console.ResetColor();
}
}
catch(Exception ex)
{
Console.WriteLine("ERROR in DIH Trigger >>>>> " + ex.Message + "||" + ex.StackTrace);
}
I am new in solr and i want to create a new core in solr by using java code and i don't want create it by terminal and GUI of solr, this is code that i am using and i am using 6.2.1 version of solr, please help me . thanx in advance.
coreName="metademo";
String solrDir = "/home/manish/Downloads/solr-6.2.1/server/solr/";
String baseSolrUrl ="http://localhost:8983/solr/";
CoreAdminRequest.Create create = new CoreAdminRequest.Create();
create.setCoreName("metademo");
create.setInstanceDir(solrDir +File.separator );
SolrClient client2=new HttpSolrClient.Builder(baseSolrUrl).build();
create.setDataDir(solrDir + File.separator + coreName + File.separator + "data");
HttpSolrServer solrServer1 = new HttpSolrServer(solrDir,client);
CoreAdminRequest.createCore(coreName, solrDir, client2);
create.createCore(coreName, solrDir, client2);
System.out.println("Created core with name: " + coreName);
First of all, you have to create the core folder in the solr directory (in your case: /home/manish/Downloads/solr-6.2.1/server/solr/metademo).
This folder has to have the same name that you'll use in your java code.
Then inside of this new core directory (in your case named "metademo") copy from /.../solr-6.2.1/server/solr/configsets/basic_configs, the so called /conf directory.
Once copied, inside the /.../solr-6.2.1/server/solr/metademo/conf folder, you have to change the name of managed-schema file in schema.xml.
I try this:
String coreName = "metademo";
String solrDir = "/.../solr-6.2.1/server/solr/metademo";
String baseSolrUrl = "http://localhost:8983/solr/";
SolrClient client = new HttpSolrClient(baseSolrUrl);
CoreAdminRequest.Create createRequest = new CoreAdminRequest.Create();
createRequest.setCoreName(coreName);
createRequest.setInstanceDir(solrDir);
createRequest.process(client);
and works. Without previous operation your code can only throw exceptions.
The following code snippet works with Solr 8.5.2:
String core = "test";
CoreAdminRequest.Create createRequest = new CoreAdminRequest.Create();
createRequest.setCoreName(core);
createRequest.setInstanceDir("./" + core);
createRequest.setConfigSet("_default");
createRequest.process(solrClient);
The call to setConfigSet() is necessary, so that the server can know how to initialize configurations for the new core based on the specified configset. Otherwise, some exception message like "Unable to create core [test] Caused by: Can't find resource 'solrconfig.xml' in classpath" would be thrown.
I am having issues selecting everything in my 25 document Solr (3.6) index via Solrj (running Tomcat).
public static void main(String[] args) throws MalformedURLException, SolrServerException {
SolrServer solr = new HttpSolrServer("http://localhost:8080/solr");
ModifiableSolrParams parameters = new ModifiableSolrParams();
parameters.set("?q", "*:*");
parameters.set("wt", "json");
QueryResponse response = solr.query(parameters);
System.out.println(response);
}
The result I get is:
{responseHeader={status=0,QTime=0,params={?q=*:*,wt=javabin,version=2}},response={numFound=0,start=0,docs=[]}}
Also, If I take the "?" out of parameters.set("?q", "*:*");I have to terminate the compilation or else it times out. The same happens if I replace the
"*:*"
with just
"*"
Also, I have tried parameters.set("qt", "/select");to no avail.
How do you select all and actually get results through Solrj?
I am not sure why this works but after failing on a hundred ideas, this one took:
public static void main(String[] args) throws MalformedURLException, SolrServerException {
SolrServer solr = new HttpSolrServer("http://localhost:8080/solr");
ModifiableSolrParams parameters = new ModifiableSolrParams();
parameters.set("q", "*:*"); //query everything thanks to user1452132!
parameters.set("facet", true);//without this I cant select all
parameters.set("fl", "id");//send back just the id values
parameters.set("wt", "json");//Id like this in json format please
QueryResponse response = solr.query(parameters);
System.out.println(response);
}
Hope this helps someone out there.
You should be using "q" as the parameter and the following is the right syntax.
parameters.set("?q", "*:*");
The reason why it returns with "?q" is that there is no query to run, so it returns fast.
First, please test through the browser. You can also set the number of rows to return, so that you are not returning a large result set.
parameters.set("rows", 5);
Once solr query returns, you have to paginate through the results. If you had a large collection you wont be able to retrieve all of them in one go.
I think you should try to also specify your core whenever you are referring to SolrServer object, i.e., write
SolrServer solr = new HttpSolrServer("http://localhost:8080/solr/collection1");
where collection1 is the name of the core that you want to use.