#Code Online Judge (CodeOJ)
CodeOJ is a judge system used to test correctness and efficiency of programs written for various programming languages in coding contests,Recruiters can conduct Hiring Challenges and for intra-inter college coding competitions. CodeOJ aims to build an environment for the people, specifically students,around the world to interact, practice and improve their programming skills.
##Core Technologies Used
Why Choose Java : Java makes the Application platform Independent .“Write Once, Run Anywhere”
- Java for Standard Edition (J2SE)
- Java for Enterprise Edition (J2EE)
- Object Relational Mapping (ORM) using Hibernate Framework 3 by JBOSS : Hibernate makes the Judge Database Independent
- Java Beans
- Java Mail,JSTL,JUNIT for Unit Testing
- Python for Judge Script
- Twitter Bootstrap,Ajax,jQuery,JSON,CSS,HTML (Frontend)
- Database : Mysql
- Sandboxing : chroot(jail)
##Features
-
Automatic Judging
-
Web Interface for Portability and simplicity
- Beginners Corner : Contains problems for beginners
- Practice Corner : Contains problems of previous contests
- Live Programming Contests (Past contest,Current and Upcoming)
- Admin Panel : to set the contests & problems & Rate the User
-
Designed keeping security in mind
-
All code run in private mode
-
Judge and project run inside chroot (in linux)
-
Has been used for live contest
##Sandboxing : to prevent hackers to shutdown your server
you can configure chroot(jail) on your system read chroot.txt (if interested)
- code is frequently buggy and potentially malicious.
- Code must run in a restricted environment (sandbox) to prevent it from damaging the system.
- Resources (particularly, CPU time and memory) must be restricted.
- Programs must be limited to a single thread. Programs must not be permitted to spawn other processes.
- Programs must not be permitted to initiate system calls.
- Programs must not be able to communicate through TCP/IP Sockets.
##Pre-requisites and Configuration
-
Download and install Netbeans 7.1 : Quickly and easily develop desktop, mobile and web applications with Java, JavaScript, HTML5, PHP, C/C++ and more.NetBeans IDE is FREE, open source, and has a worldwide community of users and developers.
- Select Platform Linux x64 & all section
- https://netbeans.org/downloads/
+In terminal,navigate to download directory & run
sh netbeans-8.1-linux.sh
+ select tomcat server instead of glassfish during installation
- Update your system : Ubuntu Source list generator: https://repogen.simplylinux.ch/generate.php
sudo apt-get update
sudo apt-get upgrade
- Install MySQL
sudo apt-get install mysql-server
+ Start/Stop Mysql server
```
sudo service mysql start
sudo service mysql stop
```
+ To log in to MySQL as the root user:
```
mysql -u root -p
```
+ Create a New MySQL User and Database
```
create database testdb;
create user 'testuser'@'localhost' identified by 'password';
grant all on testdb.* to 'testuser';
```
-
Install phpmyadmin : phpMyAdmin is a web application that provides a GUI to aid in MySQL database administration
-
Step 1: Install Apache2, PHP and MySQL. We assume you already have installed LAMP on your system.
- Install Apache
sudo apt-get install apache2 sudo service apache2 restart- Install PHP
sudo apt-get install php5-If you need MySQL support also install php5-mysql
sudo apt-get install php5-mysql -
Step 2: Install phpMyAdmin.
sudo apt-get install phpmyadmin- After the installation has completed, add phpmyadmin to the apache configuration. ``` sudo vi /etc/apache2/apache2.conf ``` - Add the phpmyadmin config to the file. ``` Include /etc/phpmyadmin/apache.conf ``` - Restart apache: ``` sudo service apache2 restart ``` -
#Configuration
-
Download the repository in Extract to NetBeansProjects folder of your home directory
-
Open Netbeans and import project
-
Change path in src/java/connection/Path.java
static String path = "/home/<YOUR_PC_USERNAME>/NetBeansProjects/codeoj/web";
-Give permission to codeoj folder for creating directories & codefiles
chmod -R 777 codeoj
##Install packages
```
sudo apt-get install python-psutil
sudo apt-get install python-mysqldb
```
- Install the compilers of programming languages you need on your system with sudo apt-get
- Languages : Java, C, C++, Pascal,PHP, Perl, Ruby and Python,Haskell,Pike etc.
##Database
-
Create database named "code_online_judge"
-
Change user and pass in src/java/connection/Config.java
String url = "jdbc:mysql://localhost:3306/code_online_judge";
String user = "<YOUR_MYSQL_USER>";
String pass = "<YOUR_MYSQL_PASSWORD>";
- Open judge.py in web folder & change line 72 and line 316 with your database username and password
db = MySQLdb.connect("localhost","db_user","db_pass","code_online_judge")
##To Run :
- Right click on Project codeoj & select deploy to run the project
- No need to import the database as hibernate framework will take care of it.
- Add username & password(md5) in Admin Table for admin panel access
goto http://localhost/codeoj/ap/adminpanel.jsp
-
Add Entry with integer 1 in id Table for unique codefilename generator
-
Goto admin panel to set a contest:
- Contest Code(without spaces)
- Contest Name
- Contest Timing,Poster,no. of problems and instructions for contest
-
Set problems :
- problem code (should be in format CONTESTCODE<s.no>) e.g TEST1,TEST2 (if contest name is TEST)
- Problems name,setter,tester,timelimit(should be integer in seconds)
- Problems Description and Number of TEST FILES(should be in format in<s.no>.txt and out<s.no>.txt) e.g in1.txt,in2.txt,out1.txt,out2.txt
-
During Contest User should register for contest on:
http://localhost/codeoj/index.jsp
+ User can View problems,Comment on problems,View his submissions and LeaderBoard
+ To Submit, select language and paste your code in the editor itself or browse the codefile & Judge will return the verdict in a while.
-
After Contest Ends :
- Make solutions public by clicking on "Make public" tab
- Update the Ratings of the Users participated in contest (ELO Algorithm is used to calculate Ratings)