Troubleshoot… List all installed versions 25 Oct 201925 Oct 2019 You could use update-alternatives: sudo update-alternatives --config java
Troubleshoot… Timezone error 5 Oct 20195 Oct 2019 In older drivers timezone has to be defined explicitly. Change the connection string as shown below: jdbc:mysql://localhost/db?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
Troubleshoot… Root account cannot connect 5 Oct 201925 Oct 2019 This is actually a good restriction. As a general thumb of rule, you should not use the root account for the applications. Create another user, set the privileges accordingly and…
Troubleshoot… Hash function conflict 5 Oct 201925 Oct 2019 Reset the password using the following commands: sudo mysql -u root -p ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root';
Install Install valgrind 26 Aug 20192 Oct 2019 Installation via apt: sudo apt install valgrind On how to use valgrind for debugging read this article.
Install… Install C/C++ core 26 Aug 201927 Aug 2019 Installation via apt: sudo apt update sudo apt install build-essential It is highly recommended that you install valgrind for debugging and memory leak detection and that you install an IDE.…
Guides… Prepare your computer to write Java EE 8 REST code (jersey) 21 Jul 20196 Oct 2019 Important note: The following instructions are for the Technologies of Internet applications course of DIT (ΤΕΔ) for Java EE 8. The instructions could be used by those who will follow…
Applications… Install Apache Tomcat 21 Jul 20196 Oct 2019 It can be quite complex to setup Apache Tomcat. Before doing so, you could consider other alternative options: If you are going to use Spring Boot you can just use…
Install… Install Netbeans IDE 21 Jul 20195 Oct 2019 First, you should install Java. As a general thumb of rule, the JDK 1.8 version is the most used and the most stable JDK you could use. Read more at…
install… Install Open JDK 2 Jul 20192 Oct 2019 For a list of installed versions you can use the following command: update-java-alternatives -l If you have many versions installed, you can select which one will be the default via…
Install… Install Mysql and mysql-workbench 2 Jul 20196 Oct 2019 To install latest MySQL to Ubuntu perform the following steps: 1) Download and add the repositories Download the repositories from the official download page manually. Install them. 2) Update the…
How-To… Use valgrind to debug C/C++ applications 14 Mar 201912 Oct 2019 For simple debugging: ./valgrind program To detect memory leaks: ./valgrind --leak-check=full program Use the flag -g3 to compile the application with gcc (or g++) After the compilation run your application…
Install… Install ipython with autoload 1 Nov 20182 Oct 2019 1. Install ipython: pip install ipython 2. Create a default profile: ipython profile create 3. Edit profile at: ~/.ipython/profile_default/ipython_config.py and add (or uncomment) the following lines: c.InteractiveShellApp.exec_lines = [] c.InteractiveShellApp.exec_lines.append('%load_ext…
Guides… Install MPI 19 Sep 20186 Oct 2019 Installation via apt: sudo apt update sudo apt install build-essential sudo apt install mpich sudo apt install libmpich-dev Here are the steps: Step 1 - Update the repository sudo apt…
Guides… Install lazarus 12 Aug 20186 Oct 2019 Summary of what you are going to install: Lazarus IDEanchordocking design package for a dockable GUI 1) Install Lazarus IDE At first try to download it from the standard APT…
Guides… Prepare your computer to write Java EE 8 code 9 Jul 20186 Oct 2019 Important note: The following instructions are for the Technologies of Internet applications course of DIT (ΤΕΔ) for Java EE 8. The instructions could be used by those who will follow…
Guides… Prepare your computer to write Sunspot code 7 Jul 20186 Oct 2019 Note: These instructions are mainly for students of DIT (UoA). Summary of what you are going to install to your computer: virtualbox virtualbox extensions You will install the following software inside…
Install… Install bottle 31 May 20183 Oct 2019 Summary of what you are going to install: pythonpipbottle Install python, pip and bottle via apt: sudo apt update sudo apt install python3.6 sudo apt -y install python3-pip sudo pip3…
How-To… Hints for debugging simple TCP applications 29 May 20182 Oct 2019 Summary of what you are going to install: ncatcurl Summary of the commands: sudo apt install ncat sudo apt install curl echo "hello world" > /dev/tcp/localhost/11111 echo "hello world" |…
Books… Murach’s Java Servlets and JSP 1 Apr 201822 Jul 2019 Murach's Java Servlets and JSP The best book for Servlets and JSP. Progressive difficulty and a lots of a examples.
Tools… Online Problem solver 6 Feb 20182 Oct 2019 The online solver is a mini application that comprises of a set of mini web services that solve well known problems in computer science (at bachelor level) that are frequently…
Exercises… Operation of a court with semaphores 3 Dec 20172 Oct 2019 Write a set of programs that simulate the operation of a court in a specific case scenario. Synchronization between the processes should be achieved with POSIX or System-V semaphores Resources:…
Exercises… Image Converter in NetPBM Format 3 Dec 20172 Oct 2019 Write a converter or a web application that can convert image files between any NetPBM format (support at least P1, P2, P3, P4, P5, P6 formats). Files to use as…
How-To… Use IPCS to debug IPC facilities 9 Nov 20172 Oct 2019 Prerequisites: ipcs View all memory segments and semaphore arrays: $ ipcs -s -m View details of a memory segment: $ ipcs -m -i <id> View details of a semaphore array:…
Guides… Prepare your computer to write MIPS code 7 Nov 20176 Oct 2019 Summary of what you are going to install: QtSpim Notepad++ Although you may use Linux or MAC OS as an operating system for your development computer, as a beginner it…
Install… Install XV6 Operating system 6 Nov 201727 Aug 2019 Summary of what you are going to install: qemuxv6 Summary of the commands: sudo apt update sudo apt install qemu git clone git://github.com/mit-pdos/xv6-public.git make make qemu-nox Here are the steps:…
install… Install ACM Java task force library in 64bit (Windows) 5 Nov 20172 Oct 2019 Prerequisites: Install java Summary of what you are going to install: acm library on 64 bit operating system At first you should download the acm.jar from this page. If you…
How-To… Upload files with SCP 5 Nov 20172 Oct 2019 Prerequisites: scp (pre-installed on most Linux distributions) Let's say your student ID is sdiABCDEFG and lets say you have to upload your assignment to the following address: /home/users/kXX/projectN/sdiABCDEFG/ Here are…
Install… Install LAPACKE 4 Nov 201727 Aug 2019 Prerequisites: C/C++ compiler (install link) Summary of what you are going to install: BLASLapackLapacke Summary of the commands: sudo apt update sudo apt install liblapack3 sudo apt install liblapack-dev sudo…
Books… Data Structures and Algorithm Analysis in C++ 4 Nov 20172 Oct 2019 Data Structures and Algorithm Analysis in C++, International Edition A little bit overpriced but an excellent read. Lots of examples using modern C++. The book covers almost any data structure…
Applications… Install MQTT 4 Nov 201710 Nov 2019 Summary of what you are going to install: MQTT Summary of the commands: sudo apt install mosquitto sudo apt install mosquitto-clients sudo service mosquitto status sudo service mosquitto start sudo…
Books… Design Patterns – Heads first 1 Nov 20172 Oct 2019 Head First Design Patterns - A brain friendly guide The best book for Design patterns. It is not difficult to read and It uses many illustrations which is very good…
Books… Design Patterns 1 Nov 20172 Oct 2019 Design patterns : elements of reusable object-oriented software A great book for design patterns, but it is advanced and hard to read. It is recommended as a follow up once…
Tools Linux installation script 18 Oct 20172 Oct 2019 If you use Linux, you may find useful the online Linux installation script builder. The script builder reads the data via REST and generates a table from which you can…
Tools Makefile generator 18 Oct 20172 Oct 2019 If you are writing code in C/C++ you may find useful the online makefile generator which is available as a part of the online problem solver. Please note the following:…
Books… Absolute C++ 1 Oct 20172 Oct 2019 Absolute C++, Global Edition Continue reading "Absolute C++"
Books… C++ Primer 1 Oct 20172 Oct 2019 C++ Primer C++ Primer is one of the best books to start with if you are interested in learning C++, and the first that I would recommend for a beginner.…
Books… Effective Java 1 Oct 20172 Oct 2019 Effective Java This is not a beginner's book. But it is one of the most important intermediate level books you are ever going to read. Seriously. It contains many tips…
Books… C Programming: A Modern Approach 1 Oct 20172 Oct 2019 C Programming: A Modern Approach C Programming: A Modern approach is one of the best books to start with, and the first one I recommend for C. It goes back…
How-To Computer maintenance and stability 4 Sep 20172 Oct 2019 Do not install software that advertises that it will make your computer run faster or that it will magically repair and clean up your hard drive. Most of those programs…
Guides… Prepare your computer to write Python code 20 Aug 20176 Oct 2019 Summary of what you are going to install: python pycharm Although you may use Windows or MAC OS as an operating system for your development computer, as a beginner it…
Guides… Prepare your computer to write Java code 20 Aug 20176 Oct 2019 Summary of what you are going to install: Java JDKJava IDE Although you may use Windows or MAC OS as an operating system for your development computer, as a beginner…
Guides… Prepare your computer to write C/C++ code 19 Aug 20176 Oct 2019 Summary of what you are going to install: build-essential (including gcc/g++ etc)Open JDKC/C++ IDE (netbeans)valgrind Although you may use Windows or MAC OS as an operating system for your development…