NPE trying to get class/instance layout

[Aleksey Shipilev]

Hi,

This is because ContendedSupport blows the annotation checks.

Fixed:
 https://bugs.openjdk.java.net/browse/CODETOOLS-7901783

-Aleksey

On 09/07/2016 01:57 PM, Sergey Zaytsev wrote:
> 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
>