jvm – Tarik Billa

Complete list of JVM options [duplicate]

December 13, 2023 by Tarik

You can use java -XX:+UnlockDiagnosticVMOptions -XX:+PrintFlagsFinal -version to print all options and their defaults. If you have a debug build you can use this command to print comments for the various options as well: java -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+PrintFlagsFinal -XX:+PrintFlagsWithComments -version PS: There are descriptions for most of them in this blog post: http://stas-blogspot.blogspot.bg/2011/07/most-complete-list-of-xx-options-for.html

Missing tools.jar when launching STS application

December 10, 2023 by Tarik

I solved this same problem by modifying the file “eclipse.ini”. First I tried to solve it by modifying the file SpringToolSuite4.ini, but nothing happened, because I previusly had installed the eclipse ide, and the change in SpringToolSuite4.ini didn’t work. then I modified the file eclipse.ini; and it worked. The changes that I did in eclipse.ini … Read more

Android Studio Failed to Load JVM DLL

September 4, 2023 by Tarik

It is very late for my answer but still to the people who reference this in the future, I had the same issue. Mine was x64 bit OS and I was trying to open studio.exe which is x32 bit. I opened studio64.exe and it worked.

Default values for Xmx, Xms, MaxPermSize on non-server-class machines

May 8, 2023 by Tarik

Default values for JDK 1.6.0_29 on Windows 7/32-bit: -Xmx256m -XX:MaxPermSize=64m Also value of these option can be printed by following command: java -XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+PrintFlagsFinal -version 2>&1 Then look for MaxHeapSize and MaxPermSize keys and see default values. uintx InitialHeapSize := 199947456 {product} uintx MaxHeapSize := 268435456 {product} uintx MaxPermSize = 67108864 {pd product} Here … Read more

PHPStorm/Webstorm increase memory to more than 512MB

April 6, 2023 by Tarik

Changing memory settings for PHPStorm now has a menu option:

What is the difference between the JRE and JVM? [duplicate]

March 3, 2023 by Tarik

Java Runtime Environment contains JVM, class libraries, and other supporting files. It does not contain any development tools such as compiler, debugger, etc. Actually JVM runs the program, and it uses the class libraries, and other supporting files provided in JRE. JRE = JVM + Java Packages Classes (like util, math, lang, awt, swing etc) … Read more

What is the point of invokeinterface?

February 24, 2023 by Tarik

Each Java class is associated with a virtual method table that contains “links” to the bytecode of each method of a class. That table is inherited from the superclass of a particular class and extended with regard to the new methods of a subclass. E.g., class BaseClass { public void method1() { } public void … Read more

How do I start my Java program with more than one java agent?

January 17, 2023 by Tarik

How about two javaagent parameters? java -javaagent:agentA.jar -javaagent:agentB.jar MyJavaProgram

Font is not available to the JVM with Jasper Reports

January 6, 2023 by Tarik

I tried installing mscorefonts, but the package was installed and up-to-date. sudo apt-get update sudo apt-get install ttf-mscorefonts-installer I tried searching for the font in the filesystem, with: ls /usr/share/fonts/truetype/msttcorefonts/ This folder just had the README, with the correct instructions on how to install. cat /usr/share/fonts/truetype/msttcorefonts/README You need an internet connection for this: sudo apt-get … Read more

Why is the JVM stack-based and the Dalvik VM register-based?

January 1, 2023 by Tarik

There are a few attributes of a stack-based VM that fit in well with Java’s design goals: A stack-based design makes very few assumptions about the target hardware (registers, CPU features), so it’s easy to implement a VM on a wide variety of hardware. Since the operands for instructions are largely implicit, the object code … Read more