I'm attempting to use Java Object Layout (JOL) to measure the instance size of an object that holds onto instances of some Java Records. I am getting an UnsupportedOperationException with a descrip...

Accidentally I have stumbled into a change in Java 15 that I was not aware of. Suppose I have a very simple question: what is the size of an array of 3 integers? For this, I use JOL. The code is fa...

Here are the two samples I would like to base my question on (assuming you have JOL here): Layouter layout32Bits = new HotSpotLayouter(new X86_32_DataModel()); Layouter layout64BitsComp = new HotS...

Intro: I used the JOL (Java Object Layout) tool to analyze the internal and external fragmentation of Java objects for research purpose. While doing so, I stumbled across the following: x@pc:~/U...

I'm trying to run a program using jol with Java 9 but with no luck. I have the following dependency in pom.xml: <dependency> <groupId>org.openjdk.jol</groupId> <artifactId&...

Using java-9 build 9-ea+149 and jol 0.6. Running this simple code: ArrayList<Integer> list = new ArrayList<>(); list.add(12); System.out.println(ClassLayout.parseInstance(list).toPr...

When using jol's GraphLayout class to print the graph of objects referenced from an object instance, some of the output entries say "(something else)" instead of a type and reference path. For exam...

Could you give me some information on what is exactly stored in object header? I know, that it's probably JVM dependent, but maybe for HotSpot at least? I'm looking for exact description specifical...

I'm fairly familiar with the layout of objects on the heap in HotSpot, but not so much for Android. For example, in a 32-bit HotSpot JVM, an object on the heap is implemented as an 8-byte header, ...