<repositories>
    <repository>
        <id>jitpack.io</id>
        <url>https://jitpack.io</url>
    </repository>
</repositories>

<dependencies>
    <dependency>
        <groupId>com.github.AchyMake</groupId>
        <artifactId>Chairs</artifactId>
        <version>1.16.5</version>
        <scope>provided</scope>
    </dependency>
</dependencies>

 

if (Chairs.isSitting(player)) {
//do something
}