JOL is the set of tools for examining field and object layouts in JVM.
'org.openjdk.jol:jol-core:0.3'
<dependency>
<groupId>org.openjdk.jol</groupId>
<artifactId>jol-core</artifactId>
<version>0.3</version>
</dependency>
<dependency org="org.openjdk.jol" name="jol-core" rev="0.3"/>
"org.openjdk.jol", "jol-core", "0.3"