Error creating bean with name 'mongoTemplate' while connecting mongodb through Spring

You only need below dependency and it will bring you all needed jars.

 <dependency>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-data-mongodb</artifactId>  </dependency>

The error java.lang.NoSuchMethodError you are getting is for ClassTypeInformation class. Please check whether spring-data-commons-1.12.3.RELEASE.jar is present after you build your project. If not, then try cleaning up your build environment and update maven project.

A little late to the party, but here is what you need.

If you are trying to use a custom data manipulation rather than using the default inbuilt mongo repositories, then you need a mongoTemplate (kind of jdbc template but lets you define your own implementation of the client, i.e, the mongo client , in this case) and optionally mongoOperations on top of it(Mongo Operations is kind of a wrapper on top of the mongoTemplate)

You need the following dependencies - pom.xml:

        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-data-mongodb</artifactId>        </dependency> <!-- https://mvnrepository.com/artifact/org.mongodb/mongo-java-driver -->        <dependency>            <groupId>org.mongodb</groupId>            <artifactId>mongo-java-driver</artifactId>        </dependency>

MongoConfig.java

@PropertySource("classpath:application.properties")public class MongoConfig{    @Value("${spring.data.mongodb.host}")    private String mongoHost;        @Value("${spring.data.mongodb.port}")    private String mongopPort;            @Value("${spring.data.mongodb.database}")    private String mongoDB;    /*Client vs FactoryClient     *      * Factory bean that creates the com.mongodb.MongoClient instance     *      * Classes attributed with @Repostiory may throw mongo related exceptions. Declaring an instance of MonogClientFactoryBean     * helps in translating them to spring data exceptions which can then be caught using @ExceptionHandling     * */     public @Bean MongoClientFactoryBean mongo() throws Exception {          MongoClientFactoryBean mongo = new MongoClientFactoryBean();          mongo.setHost("localhost");          MongoClientOptions clientOptions = MongoClientOptions.builder().applicationName("FeddBackAPI_DB")                      .connectionsPerHost(2000)                      .connectTimeout(4000)                      //.maxConnectionIdleTime(1000000000)                      .maxWaitTime(3000)                      .retryWrites(true)                      .socketTimeout(4000)                      .sslInvalidHostNameAllowed(true)//this is very risky                                            .build();          mongo.setMongoClientOptions(clientOptions);                    return mongo;     }}

DataSourceConfig.java

@Configuration@Import(value=MongoClientFactory.class)public class DataSourceConfig {        @Autowired    Mongo mongo;        @Autowired    Environment env;        @Bean    public String test() {        System.out.println("mongo"+mongo);        return "rer";    }        @Bean    @Qualifier("customMongoTemplate")    public MongoTemplate mongoTemplate() {                //MongoClient is the actual pool used by mongo. Create it using client factory then, autoclosing of threads are handled on its own        MongoDbFactory factory = new SimpleMongoDbFactory((MongoClient) mongo, "mongo_test");        MongoTemplate template = new MongoTemplate(factory);                return template;    }        @Bean    @Qualifier(value="customMongoOps")    public MongoOperations mongoOps() {        MongoOperations ops = mongoTemplate();        return ops;    }            @Bean    public MongoDbFactory factory() {        MongoDbFactory factory = new SimpleMongoDbFactory((MongoClient) mongo, "mongo_test");        return factory;    }    //  @Bean//  public GridFsTemplate gridFsTemplate() {//      return new GridFsTemplate(mongo, converter)//  }        }

This should successfully create the mongoTemplate and mongoOperations and you should be able to make use of them in your DAO or service and access them.

PersonService.java

    @Service    public class PersonService {        @Autowired        private PersonRepository personRepo;                @Autowired        PersonSequenceServiceImpl seqService;                @Autowired        @Qualifier(value="customMongoOps")        MongoOperations mongoOps;                public List<Person> findAllPersons() {            return personRepo.findAll();        }                public List<Person> createAndFindAllPersons() {            Person p1 = new Person( "another1", "ll1", 30);            Person p2 = new Person( "another2", "ll2", 30);                        if(!mongoOps.collectionExists(Person.class)) {                mongoOps.dropCollection("Person_table");            }            //return personRepo.save(person);                                            System.out.println("P1 data before inserting:"+p1);            mongoOps.insert(Arrays.asList(p1,p2), Person.class);            //mongoOps.dropCollection(Person.class);            return mongoOps.findAll(Person.class);        }            }

I know it's not a technically justified solution. But after trying several alternatives, I just closed Eclipse and deleted all the .m2 folder content. Then, I retried to import the Project ina new Workspace and compiled. Surprise! This time it worked :)Sometimes rebooting works ;)