NPE trying to get class/instance layout

[Sergey Zaytsev]

Hi!

I got NPE while trying to get class or instance layout with the following stack trace… Event executing the very simple _first_ official sample ( from JOL page )

What might be the case and what am I doing wrong ?

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)



Best regards,
Serge