Spring boot + Websockets : Connection getting closed by itself.
Problem : Getting the message “Websocket already in CLOSED or CLOSING state” from browser console after sending the first message. Reason: The packe...
Author: Kj
Kj [/.] Sreekumar programs computers as a hobby and profession. Into programming from his school days, Sree uses Codemarvels to key in facts and fixes he finds interesting while working on different projects. Some of the articles here give away a few shades of his philosophical leanings too.
UTF-8 breaks on Ubuntu (minimal install) server applications
Problem : UTF-8 content is displayed and treated as garbage (eg: DL4J vector search misses all the time) Reason: User’s default encoding not set to UTF-8....
Fixed : “Json Array should begin with [” error on UTF-8 or UTF-16 files
Problem : JSON file which store top level JSON arrays just wouldn’t parse (using org.json library), and gives out an error message like – “Jso...
Bash on VNC session – Tabs do not auto complete
Problem : Pressing Tab keys not auto-completing when using Bash within a VNC session (to guest VM running on Ubuntu and XFCE.) Reason : Unknown, possibly tabs a...
Fix: Unable to connect to RabbitMQ server from remote clients
Problem : When connected from a remote client, this error is thrown (at client) – An unexpected connection driver error occured (Exception message: Socket...
Increase Zuul timeouts for backend BOSH or Comet servers
This is how I could make Spring Zuul work with my backend XMPP (over BOSH) server which had a hanging post of 5 mins. Please find the relevant settings in appli...
MySQL Data migration from one server box to another
Here’s a quick way to move data from one MySQL server to another Let source box be ServerOne, and the target box be ServerTwo. (user-names and sche...
Add Indic fonts for use by Java in Ubuntu server
This is how I could add Indic fonts to Ubuntu server and make them available for use by Java – Run on teminal – sudo apt-get install fonts-in...
Fix : Cassandra not accessible from outside the local machine.
Problem: In Single node setup of cassandra, after installation and starting Cassandra, the native port (9042) is not accessible from outside the local box. Reas...
Install Artefactory Maven repository on Ubuntu 16.04
Follow these steps to install Artifactory Maven repository on Ubuntu 16.04 ( terminal commands, mostly )- wget -c -O- “https://bintray.com/user/dow...