Dedetok: My Experience Notes: Debian Jessie: installing OpenJDK-8, Mysql JDBC and PostgreSQL JDBC

Friday, October 28, 2016

Debian Jessie: installing OpenJDK-8, Mysql JDBC and PostgreSQL JDBC

Install all packages:

# apt-get install openjdk-8-jdk libmysql-java libpostgresql-jdbc-java libpostgresql-jdbc-java-doc

Note: openjdk-8-jdk requires backports repository, add this into /etc/apt/sources.list

deb http://ftp.de.debian.org/debian jessie-backports main

To set Java Environment for all users, add/edit /etc/environment:

JAVA_HOME="/usr/lib/jvm/java-8-openjdk-amd64"
CLASSPATH=".:/usr/share/java/mysql.jar:/usr/share/java/postgresql-jdbc4.jar"

Note: if you prefered to use postgresql-jdbc3, replace /usr/share/java/postgresql-jdbc4.jar with /usr/share/java/postgresql.jar

Example Java code loading MySQL:

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

import java.util.Properties;

class TestDB {

/*

/usr/share/java

http://dev.mysql.com/doc/connector-j/5.1/en/

https://jdbc.postgresql.org/documentation/documentation.html

*/

static Connection conn = null;

public static void main(String[] args) {

// MySQL

try {

System.out.println("Loading Class com.mysql.jdbc.Driver");

Class.forName("com.mysql.jdbc.Driver") ;

System.out.println("Loading com.mysql.jdbc.Driver Successful");

conn = DriverManager.getConnection("jdbc:mysql://localhost/database?user=user&password=password");

// Do something with the Connection

System.out.println("Test Connection Successful");

} catch (SQLException ex) {

// handle any errors

System.out.println("SQLException: " + ex.getMessage());

System.out.println("SQLState: " + ex.getSQLState());

System.out.println("VendorError: " + ex.getErrorCode());

} catch (ClassNotFoundException ex) {

System.out.println("Class Not Found: " + ex.getMessage());

}

// PostgreSQL

try {

System.out.println("Loading Class org.postgresql.Driver");

Class.forName("org.postgresql.Driver");

System.out.println("Loading org.postgresql.Driver Successful");

String url = "jdbc:postgresql://localhost/database";

Properties props = new Properties();

props.setProperty("user","user");

props.setProperty("password","password");

props.setProperty("ssl","true");

conn = DriverManager.getConnection(url, props);

// or

url = "jdbc:postgresql://localhost/database?user=user&password=password&ssl=true";

Connection conn = DriverManager.getConnection(url);