Erro ao consumir uma api

Olá pessoal, resolvi criar uma api para fixar os conteudos passados no curso, primeiramente estou fazendo uma api vai mostrar a cotação do dolár diário, porém ao executar o programa é lançaco um erro interno (ERRO 500), verifiquei a URL que estou passando no postman e os dados são retornados, porem ao chamar pelo programa é gerado este erro e não consegui identificar, abaixo as classes que utilizei: Classe DTO

public class DolarDiarioDto {

    private String cotacaoCompra;
    private String cotacaoVenda;
    private String dataHoraCotacao;
    /* getters e setters*/

Classe Service

import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;
import br.com.cotacaoapi.model.dto.DolarDiarioDto;
import br.com.cotacaoapi.util.BaseUrlConstante;


@Service
public class CotacaoService {

    public DolarDiarioDto retornarValorDiario()  {
        RestTemplate restTemplate = new RestTemplate();

        String uri = BaseUrlConstante.BASE_URL+ BaseUrlConstante.DOLAR_DIARIO+"'07-02-2021'";
        System.out.println("### URL ####\n");
        System.out.println(uri);
        DolarDiarioDto  retorno = restTemplate.getForObject("https://olinda.bcb.gov.br/olinda/servico/PTAX/versao/v1/odata/CotacaoDolarDia(dataCotacao=@dataCotacao)?%40dataCotacao='07-02-2021'", DolarDiarioDto.class);

        return retorno;
    }
}

Controller

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


import br.com.cotacaoapi.model.dto.DolarDiarioDto;
import br.com.cotacaoapi.service.CotacaoService;

@RestController
@RequestMapping("/cotacao")
public class CotacaoApiController {
    @Autowired
    private  CotacaoService cotacaoService;

    @GetMapping("/dolardiario")
    public ResponseEntity<DolarDiarioDto> exemplo(){


            DolarDiarioDto dados = cotacaoService.retornarValorDiario();
            return ResponseEntity.ok(dados);

    }
}

Pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>br.com.cotacaoapi</groupId>
    <artifactId>cotacaoapi</artifactId>
    <version>0.0.1</version>
    <name>cotacaoapi</name>
    <description>API para cotação Dólar</description>
    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>2020.0.3</spring-cloud.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
    </dependencies>


    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
</project>