Accidentally I have stumbled into a change in jdk-15 that I was not aware of. Suppose I have a very simple question: what is the size of an array of 3 ...

L's code is very simple Uncommenting, running the code again will result in different results, or two completely different results. I want to kno ...

OpendJDK has a Java Object Layout (JOL) tool which allows to estimate instance real memory size of specified object. It can show an object layout for ...

Here are the two samples I would like to base my question on (assuming you have JOL here): And an example using this: And here are the two outpu ...

Intro: I used the JOL (Java Object Layout) tool to analyze the internal and external fragmentation of Java objects for research purpose. While doing ...

I've tried to measure size of one instance of the class A: Result using VisualVm was 20 bytes: But result using JOL was 16 bytes: Here is com ...

I'm trying to run a program using jol with Java 9 but with no luck. I have the following dependency in pom.xml: The program is simple: Module d ...

Using java-9 build 9-ea+149 and jol 0.6. Running this simple code: Output: This access denied part comes from FieldData.java in the method: ...

I was wondering if it is possible to prevent an object from being moved around by the GC by setting one of the bits in the mark word of the object hea ...

Here is a link to the code in question - http://hg.openjdk.java.net/code-tools/jol/file/07087260ce41/jol-samples/src/main/java/org/openjdk/jol/samples ...

I read it in multiple places that using byte[] instead of string would save you memory. I wanted to test it out using jol. Here my test: Here is m ...

I'm trying to use jol, from openJDK. I downloaded the jar from here: http://central.maven.org/maven2/org/openjdk/jol/jol-cli/0.4/jol-cli-0.4.jar Ho ...

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)" ...

The JOL tool gives ability to count object's memory layout. I've noticed, that static fields do not participate in calculating, for example: then, ...

I am trying to make sense of the output of Java object layout on a 64-bit HotSpot VM (v8). I do not understand how the first three bit of the mark wor ...

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 leas ...

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 objec ...