问Spring Boot在读取第二个数据库时无法解析占位符

EN

@Configuration
@PropertySource(value={"classpath:application.properties"})
@ConfigurationProperties(prefix = "spring.second-datasource")
public class DatabaseConfiguration {

    @Value("${url}")
    private String url;
    @Value("${username}")
    private String user;
    @Value("${password}")
    private String password;

    public String getUrl() {
        return url;
    }

    public String getUser() {
        return user;
    }

    public String getPassword() {
        return password;
    }
}

private DatabaseConfiguration databaseConfiguration;
databaseConfiguration.getUrl();
.
.
.

Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'url' in value "${url}"

<artifactId>//artifactID</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>fraud-core</name>
<description>Demo project for Spring Boot</description>

<parent>
   //Parent
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
    <HMN_CDM_Facade.version>TEST-SNAPSHOT</HMN_CDM_Facade.version>
    <hmn.dependency.scope>compile</hmn.dependency.scope>
</properties>

<dependencies>
    //DEPENDENCIES
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>

    <resources>
        <resource>
            <directory>src/main/resources</directory>
            <filtering>true</filtering>
            <includes>
                <include>**/*.properties</include>
            </includes>
        </resource>
    </resources>
</build>