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Olá, João

Esse erro é referente a alguma configuração do banco de dados que não está OK. Você está usando qual banco? Importou as dependências do banco e já configurou o seu application.properties?

Traga-nos mais informações, poste aqui o seu pom.xml e o application.properties

Oi, Mateus.

Estou usando o MySQL.

application.properties

spring.datasource.url=jdbc:mysql://localhost/vollmed_api?createDatabaseIfNotExist=true
spring.datasource.username=root
spring.datasource.password=root
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.format_sql=true
server.error.include-stacktrace=never

api.security.token.secret=${JWT_SECRET:12345678}

application-prod.properties

spring.datasource.url=${DATASOURCE_URL}
spring.datasource.username=${DATASOURCE_USERNAME}
spring.datasource.password=${DATASOURCE_PASSWORD}

spring.jpa.show-sql=false
spring.jpa.properties.hibernate.format_sql=false

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>3.1.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>med.voll</groupId>
    <artifactId>springboot_api</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot_api</name>
    <description>API Rest da aplicação Voll.med</description>
    <properties>
        <java.version>17</java.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.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>
        <dependency>
            <groupId>org.flywaydb</groupId>
            <artifactId>flyway-core</artifactId>
        </dependency>
        <dependency>
            <groupId>org.flywaydb</groupId>
            <artifactId>flyway-mysql</artifactId>
        </dependency>

        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
            <scope>runtime</scope>
        </dependency>
        
        <dependency>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        
        <dependency>
              <groupId>org.springframework.security</groupId>
              <artifactId>spring-security-test</artifactId>
              <scope>test</scope>
        </dependency>
        
        <dependency>
              <groupId>com.auth0</groupId>
              <artifactId>java-jwt</artifactId>
              <version>4.2.1</version>
        </dependency>
        
        <dependency>
              <groupId>org.springdoc</groupId>
              <artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>
              <version>2.2.0</version>
           </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>

</project>

Parece que no seu application.properties está faltando informar qual a classe do driver JDBC, o Spring não soube identificar quem é a classe driver. Acredito que adicionando esta properiedade de configuração deve funcionar:

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

spring.datasource.url=jdbc:mysql://localhost/vollmed_api?createDatabaseIfNotExist=true
spring.datasource.username=root
spring.datasource.password=root
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.format_sql=true
server.error.include-stacktrace=never

api.security.token.secret=${JWT_SECRET:12345678}

Adicione essa propriedade "spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver" nos seus dois arquivos.

O erro ainda persiste, mesmo após adicionar a propriedade "spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver".