How to Authenticate Against openLDAP Without Knowing DN Using java

In fact you can’t do it without knowing DN! There is an anonymous access in openLDAP which is enabled by default. The anonymous access let one to query(search filter) openLDAP without knowing bind username/password. Run following command on your openLDAP server : ldapwhoami -H ldap:// -x If you get “anonymous” as result you are all […]

How to use CompletableFuture in SpringBoot 2

In Spring Boot there is an annotation @Async to assist developers for developing concurrent applications. But using this feature is quite tricky. In this blog we will see how to use this feature along with CompletableFuture. I assumed you know the drill about CompletableFuture, so I won’t repeat the concept here. First of all you […]

How to install maven on Ubuntu manually with any specific version

For installing Maven on Ubuntu you have two ways  the easy way and the manual method. The easy way is just execute following command : sudo apt-get install maven Or if you use Ubuntu 16+ you can use following command too : sudo apt install maven Just remember you need to have root privileges. The […]

How to install JDK on Ubuntu

Installing Java JDK is easy and straightforward in Windows and OSX but not in Ubuntu. Here is how I am installing JDK on Ubuntu. Download the latest JDK package from Oracle website. If you don’t know which file to choose you ought to select .tar.gz files whether 32bit or 64bit depends on your requirements. after […]