Graphlayout fails in jetty/spring

[Akbar Bash]

I am running  a web app in jetty and trying to measure the size of one of
the instances.
When i tried  from console I am getting the below warnings followed by
classnotfound error

# WARNING: Unable to get Instrumentation. Dynamic Attach failed. You may
add this JAR as -javaagent manually, or supply -Djdk.attach.allowAttachSelf
# WARNING: Unable to attach Serviceability Agent. Unable to attach even
with module exceptions: [org.openjdk.jol.vm.sa.SASupportException: Sense
failed., org.openjdk.jol.vm.sa.SASupportException: Sense failed.,
org.openjdk.jol.vm.sa.SASupportException: Sense failed.]

java.lang.ClassNotFoundException:
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:348)
        at org.openjdk.jol.util.ClassUtils.loadClass(ClassUtils.java:70)
        at
org.openjdk.jol.operations.ClasspathedOperation.run(ClasspathedOperation.java:76)
        at org.openjdk.jol.Main.main(Main.java:60)

I provided as javaagent library as part of the jetty startup configuration.

When I used the GraphLayout API in the code. parseInstance() never
returns.  The instance is wired using Spring.
Can you please let me know what should be the problem.

Regards,
Akbar