Reproduces when running any sample with, say, JDK 7:

Exception in thread "main" java.lang.NullPointerException
at java.util.Objects.requireNonNull(Objects.java:203)
at java.lang.Class.getAnnotation(Class.java:3413)
at org.openjdk.jol.vm.ContendedSupport.isContended(ContendedSupport.java:59)
at org.openjdk.jol.info.ClassData.parse(ClassData.java:100)
at org.openjdk.jol.info.ClassData.parseClass(ClassData.java:62)
at org.openjdk.jol.info.ClassLayout.parseClass(ClassLayout.java:67)
at org.openjdk.jol.info.ClassLayout.parseClass(ClassLayout.java:51)
at org.serge.memfootprint.Layout.main(Layout.java:30)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)