<Resource auth="Container" driverClassName="com.mysql.jdbc.Driver"
                       maxActive="20"
           global="jdbc/otp1"
                       maxIdle="0"
                       maxWait="10000"
                       name="jdbc/otp1"
                       password="root"
                       username="root"
                       type="javax.sql.DataSource"
                       url="jdbc:mysql://localhost:3306/test"/>

<ResourceLink name="jdbc/otp"
          global="jdbc/otp1"
          auth="Container" type="javax.sql.DataSource" />
enter code here

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <scope>runtime</scope>
    </dependency>

    <dependency>
        <groupId>org.apache.tomcat</groupId>
        <artifactId>tomcat-jdbc</artifactId>
        <version>9.0.8</version>
    </dependency>
</dependencies>
<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

@Configuration

@Bean
public DataSource getDataSource(){
    JndiDataSourceLookup dsLookup = new JndiDataSourceLookup();
    dsLookup.setResourceRef(true);
    DataSource dataSource=dsLookup.getDataSource("jdbc/otp");
    return dataSource;

}