pom.xml无法从外部属性文件读取属性

<build>
    <plugins>
        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>properties-maven-plugin</artifactId>
            <version>1.0.0</version>
            <executions>
                <execution>
                    <goals>
                        <goal>read-project-properties</goal>
                    </goals>
                    <phase>initialize</phase>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

database.url=jdbc:mysql://localhost:3306/mydb
database.username=root
database.password=secret

<properties>
    <database.url>${database.url}</database.url>
    <database.username>${database.username}</database.username>
    <database.password>${database.password}</database.password>
</properties>