JOL is the set of tools for examining field and object layouts in JVM.
'org.openjdk.jol:jol-parent:0.2'
<dependency>
<groupId>org.openjdk.jol</groupId>
<artifactId>jol-parent</artifactId>
<version>0.2</version>
</dependency>
<dependency org="org.openjdk.jol" name="jol-parent" rev="0.2"/>
"org.openjdk.jol", "jol-parent", "0.2"