Configuring Entity wrapping with Spring Data Rest. Ember Data HAL 9000 for example requires this.

Project.java

package com.cedricziel.tcagen.backend.domain;

@Data
@NoArgsConstructor
@Entity
@Table(name = "projects")
// JsonRootDetermines the enclosuere for the entity in json responses
@JsonRootName("project")
public class Project implements Serializable {
  // ..
}

SpringDataRestConfig.java

package com.cedricziel.tcagen.backend.config;

import com.cedricziel.tcagen.backend.domain.Extension;
import com.cedricziel.tcagen.backend.domain.Project;
import com.cedricziel.tcagen.backend.domain.TcaTable;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.rest.core.config.RepositoryRestConfiguration;
import org.springframework.data.rest.webmvc.config.RepositoryRestMvcConfiguration;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;

@Configuration
public class SpringDataRestConfig extends RepositoryRestMvcConfiguration {

    @Autowired(required = false)
    private Jackson2ObjectMapperBuilder objectMapperBuilder;

    @Bean
    @ConfigurationProperties(prefix = "spring.data.rest")
    @Override
    public RepositoryRestConfiguration config() {

        return super.config();
    }

    @Override
    protected void configureJacksonObjectMapper(ObjectMapper objectMapper) {

        if (this.objectMapperBuilder != null) {
            this.objectMapperBuilder.configure(objectMapper);
        }
        objectMapper.configure(DeserializationFeature.UNWRAP_ROOT_VALUE, true);
    }

    @Override
    protected void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {

        super.configureRepositoryRestConfiguration(config);

        config.exposeIdsFor(Project.class);
        config.exposeIdsFor(Extension.class);
        config.exposeIdsFor(TcaTable.class);
    }
}