Calculate the size of a cache using jol (Java Object Layout) (eviction concerns not taken care of)

CacheSizing.java

public class CacheSizing {
    public static final int _10_MEGABYTE = 10_000_000;
    // The type Value is a Value Object whose max size is known, that is :
    //  - no string with "unbounded" variable length
    //  - no Collection with any size

    @Test
    public void possible_cache_size_value() {  
        int possible_cache_size_per_server = 10_000;
        LoadingCache<String, Value> c = CacheBuilder.newBuilder()
                                                    .maximumSize(possible_cache_size_per_server)
                                                    .recordStats()
                                                    .build(new CacheLoader<String, Value>() {
                                                        @Override
                                                        public Value load(String accessToken) {
                                                            return ...;
                                                        }
                                                    });
        c.putAll(Stream.generate(ValueFactory::create)
                       .limit(10_000)
                       .collect(toMap(Value::key, Function.identity())));
                       
        System.out.println(GraphLayout.parseInstance(c).toFootprint());
        assertThat(GraphLayout.parseInstance(c).toFootprint()).isLessThan(_10_MEGABYTE);
    }
}

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 http://maven.apache.org/xsd/maven-4.0.0.xsd">

        <dependencies>
            <dependency>
                <groupId>org.openjdk.jol</groupId>
                <artifactId>jol-core</artifactId>
                <version>${jol-core.version}</version>
                <scope>test</scope>
            </dependency>
        </dependencies>
        
</pom>