Spring Boot + Elasticsearch

Spring Data Elasticsearch	Elasticsearch
2.0.0.RELEASE	2.2.0
1.4.0.m1	1.7.3
1.3.0.RELEASE	1.5.2
1.2.0.RELEASE	1.4.4
1.1.0.RELEASE	1.3.2
1.0.0.RELEASE

Https://github.com/helloworldtang/spring-data-elasticsearch

1. None of the configured nodes is available or

Org.elasticsearch.transport.RemoteTransportException:Failed to deserialize exception response from stream

Cause: The version of Spring data ElasticSearch does not match the spring boot, elasticSearch version.

Solve:

Spring Boot Version (x)	Spring Data Elasticsearch Version (y)	Elasticsearch Version (z)
X <= 1.3.5	Y <= 1.3.4	Z <= 1.7.2*
X >= 1.4.x	2.0.0 <=y < 5.0.0**	2.0.0 <= Z < 5.0.0**

This is the correspondence between versions. Spring boot 1.3.5 The default Elasticsearch version is 1.5.2, at which point the Elasticsearch client connection under version 1.7 is OK.

Note: Note that the ES default connection port for Java is 9300,9200 is the HTTP port, and these two should be differentiated in use.

2, caused by:java.lang.IllegalArgumentException: @ConditionalOnMissingBean annotations must specify at least one bean (ty PE, name or annotation)

Cause: Spring boot is a 1.3.x version, and ES has a 2.x version. Some classes have been removed in the 2.x version of ES, and these classes are still being used in the 1.3.x version of spring boot, causing this error.

Workaround: Launch a specific version of ES according to the version of issue 1.

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We often use Elasticsearch to improve performance application, especially searching and caching ation scale and adapt in real-time.

Elasticsearch is a flexible and powerful open source, distributed, real-time search and analytics engine. In this article, I would like to introduce how to use Elasticsearch in Java applications:by using Spring Boot data elasti Csearch. Spring Boot now easy and powerful, and we can build fast Java and Web applications with a simple configuration.

By following the steps below, you can start writing your first application.

Source Code:https://github.com/herotl2005/spring-data-elasticsearch-sample

Requirement enviroment

1. Install Elasticsearch

2. Install Gradle

3. IDE Eclipse or Intellij idea

Step by Step Coding

1. Gradle Build

dependencies {testcompile group: ' JUnit ', Name: ' JUnit ', Version: ' 4.11 ' compile ' org.springframework.boot: Spring-boot-starter-data-elasticsearch:1.2.0.release ' Compile ' Org.springframework.data:spring-data-cassandra : 1.1.1.RELEASE ' compile ' org.springframework:spring-test:4.1.2.release ' compile ' org.springframework.boot: Spring-boot-starter-logging:1.2.0.release ' Compile ' org.springframework.boot:spring-boot-starter-web:1.2.0. RELEASE ' compile ' org.springframework.boot:spring-boot-starter-actuator:1.2.0.release '}

2. Elasticsearch Configuration

@[email protected] (value = "Classpath:elasticsearch.properties") @EnableElasticsearchRepositories (basepackages = " Co.paan.repository ") public class Elasticsearchconfiguration {    @Resourceprivate environment environment;@ Beanpublic Client Client () {        transportclient client = new Transportclient (); Transportaddress address = new Inetsockettransportaddress (Environment.getproperty ("Elasticsearch.host"), Integer.parseint (Environment.getproperty ("Elasticsearch.port")); client.addtransportaddress (address);        return client;}    @Beanpublic elasticsearchoperations elasticsearchtemplate () {        return new Elasticsearchtemplate (client ());}     }

You put Elasticsearch host and post in your application properties file.

Elasticsearch.host = localhost # If you use the local elasticsearch Hostelasticsearch.port = 9300

3. Data Mapping object:

In this application, we have 2 entities data Object Mapping:post and Tag

@Document (IndexName = "POST", type = "POST", shards = 1, replicas = 0) public class Post {@Idprivate String ID;    Private String title;//@Field (type= fieldtype.nested) private list<tag> tags;    Public String getId () {        return ID;}    public void SetId (String id) {        this.id = ID;}    Public String GetTitle () {        return title;}    public void Settitle (String title) {        this.title = title;}    Public list<tag> GetTags () {        return tags;}    public void Settags (list<tag> tags) {        this.tags = tags;}}

public class Tag {private String ID;    private String name;    Public String getId () {        return ID;    }    public void SetId (String id) {        this.id = ID;    }    Public String GetName () {        return name;    }    public void SetName (String name) {        this.name = name;  }}

4. Repository:we extends from Elasticsearchrepository

Public interface Postrepository extends Elasticsearchrepository<post, string>{    page<post> Findbytagsname (String name, pageable pageable);}

5. Data Access Service

Public interface Postservice {    post Save (post post);    Post FindOne (String ID);    Iterable<post> findAll ();    Page<post> Findbytagsname (String tagName, Pagerequest pagerequest);}

@Servicepublic class Postserviceimpl implements postservice{    @Autowiredprivate postrepository postrepository;@ Overridepublic Post Save (post Post) {        postrepository.save (post);                      return post;       }    @Overridepublic Post FindOne (String id) {        return postrepository.findone (ID);   }    @Overridepublic iterable<post> FindAll () {        return postrepository.findall ();   }    @Overridepublic page<post> findbytagsname (String tagName, Pagerequest pagerequest) {        return Postrepository.findbytagsname (TagName, pagerequest);}   }

6. Testing and the result

 @Testpublic void Testfindbytagsname () throws Exception {tag tag = new Tag (); Tag.setid ("1") ; Tag.setname ("Tech"); Tag tag2 = new Tag (), Tag2.setid ("2"), Tag2.setname ("Elasticsearch"); Post post = new post ();p Ost.setid ("1");p Ost.settitle ("Bigining with spring boot application and Elasticsearch"); Post.settags (arrays.aslist (tag, tag2));p ostservice.save (POST); Post Post2 = new post ();p Ost2.setid ("1");p Ost2.settitle ("Bigining with Spring Boot application");p Ost2.settags ( Arrays.aslist (tag));p ostservice.save (POST); Page<post> posts = postservice.findbytagsname ("Tech", New Pagerequest (0,10)); page<post> posts2 = postservice.findbytagsname ("Tech", New Pagerequest (0,10)); page<post> posts3 = Postservice.findbytagsname ("Maz", New Pagerequest (0,10)); Assertthat ( Posts.gettotalelements (), is (1L)), Assertthat (Posts2.gettotalelements (), is (1L)); Assertthat ( Posts3.gettotalelements (), is (0L));} 

7. You can find detail project at Github:https://github.com/herotl2005/spring-data-elasticsearch-sample

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Spring Boot + Elasticsearch