How the bytecode makes portability in java?

Java solves the problem of platform-independence by using
byte code. The Java compiler does not produce native
executable code for a particular machine like a C compiler
would. Instead it produces a special format called byte
code. Java byte code written in hexadecimal, byte by byte,
looks like this

CA FE BA BE 00 03 00 2D 00 3E 08 00 3B 08 00 01 08 00 20 08

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error: db5 error(11) from dbenv->open: Resource temporarily unavailable

If rpm command is not working in your system and it is giving an error message( error: db5 error(11) from dbenv->open: Resource temporarily unavailable ). What is the root cause of this issue? How to fix this issue? just a single command- [root@localhost rpm]# rpm --rebuilddb Detailed error message- [root@localhost rpm]# rpm -q firefox ^Cerror: db5 error(11) from dbenv->open: Resource temporarily unavailable error: cannot open Packages index using db5 - Resource temporarily unavailable (11) error: cannot open Packages database in /var/lib/rpm ^Cerror: db5 error(11) from dbenv->open: Resource temporarily unavailable error: cannot open Packages database in /var/lib/rpm package firefox is not installed [root@localhost rpm]# RPM manage a database in which it store all information related to packages installed in our system. /var/lib/rpm, this is directory where this information is available. [root@localhost rpm]# cd /var/lib/rpm ...

Failed to get D-Bus connection: Operation not permitted

" Failed to get D-Bus connection: Operation not permitted " - systemctl command is not working in Docker container. If systemctl command is not working in your container and giving subjected error message then simple solution of this error is, create container with -- privileged option and also provide init file full path /usr/sbin/init [root@server109 ~]# docker container run -dit --privileged --name systemctl_not_working_centos1 centos:7 /usr/sbin/init For detailed explanation and understanding I am writing more about it, please have look below. If we have a daemon based program(httpd, sshd, jenkins, docker etc.) running inside a container and we would like to start/stop or check status of daemon inside docker then it becomes difficult for us to perform such operations , because by default systemctl and service commands don't work inside docker. Normally we run below commands to check services status in Linux systems. [root@server109 ~]# systemctl status ...

call to function "map" failed: the "map" function was deprecated in Terrafrom

How to change map method to tomap method? Let's say you have multiple tags in your code which was written quite back and that time it was working fine on old Terraform version before v0.12 but if the same code you execute on updated/latest Terrafrom you get subjected error while try to run Terrafrom plan command. Then this article will help you to fix your issue. What is simple solution to fix this issue? Just replace " map " method to " tomap " and just to little bit formatting for the same. Syntax:- map ({"Name", "My_Name"), map("AppName", "My_App")}) tomap ({"Name" = "My_Name", "App_Name" = "My_App"}) or tomap ({ "Name" = "My_Name", "App_Name" = "My_App" }) #Code with " map " method resource "aws_instance" "My_instance" ami = my_ami instance_type = my_type tags = merge(var.tag...

Rakesh Kumar

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