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Author: Sreekumar Kj

Sreekumar (KJ) has been a hobby programmer from school days. Codemarvels is his personal blog from the year 2010, where he writes about technology, philosophy, society and a bit about physics. He now runs a conversational AI company - DheeYantra - focusing his efforts to help businesses improve operational efficiency using digital employees powered by AI.
technology

Fix : Touchpad not working in Ubuntu

Posted on September 6, 2017 by Sreekumar Kj / 0 Comment

Could fix the touch-pad of my Ubuntu system which went off due to an unknown reason with these commands  – Sreekumar KjSreekumar (KJ) has been a hobby prog...

notes/technology

Gnome : Bring back the maximize and minimize buttons

Posted on September 6, 2017 by Sreekumar Kj

On terminal run : gnome-tweak-tool In the dialog that pops up – Select Windows tab from the left panel. In the right panel under Tilebar buttons section – Set M...

notes/technology

Ubuntu: Load a disk on startup – the GUI way

Posted on September 6, 2017 by Sreekumar Kj

On terminal run sudo gnome-disks In the dialog box that opens, choose the disk to mount from the left panel. In the right panel click on the gears icon In the p...

Miscellaneous

Take care of this when you buy a new laptop bag..

Posted on August 21, 2017 by Sreekumar Kj

Just thought of sharing this. If you buy a new laptop bag, you have to be careful to remove the small sachets that contain small silica balls (or whatever they ...

notes/technology

Spring boot + Websockets : Connection getting closed by itself.

Posted on August 15, 2017 by Sreekumar Kj

Problem : Getting the message “Websocket already in CLOSED or CLOSING state” from browser console after sending the first message. Reason: The packet size is la...

notes/technology

UTF-8 breaks on Ubuntu (minimal install) server applications

Posted on August 8, 2017 by Sreekumar Kj

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. Fix: ...

notes/technology

Fixed : “Json Array should begin with [” error on UTF-8 or UTF-16 files

Posted on July 29, 2017 by Sreekumar Kj

Problem : JSON file which store top level JSON arrays just wouldn’t parse (using org.json library), and gives out an error message like – “Json Array should beg...

notes/technology

Bash on VNC session – Tabs do not auto complete

Posted on June 12, 2017 by Sreekumar Kj

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...

notes/technology

Fix: Unable to connect to RabbitMQ server from remote clients

Posted on May 30, 2017 by Sreekumar Kj

Problem : When connected from a remote client, this error is thrown (at client) – An unexpected connection driver error occured (Exception message: Socket close...

notes/technology

Increase Zuul timeouts for backend BOSH or Comet servers

Posted on May 29, 2017 by Sreekumar Kj

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...

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