How to install Java and Maven on FreeBSD

FreeBSD is a powerful and reliable operating system that is widely used by developers and system administrators. If you are a Java developer, you will need to install both Java and Maven on your FreeBSD system to build and run your Java applications. In this post, we will walk you through the steps to install Java and Maven on FreeBSD. Java We will start by switching to the root account, and installing java.

How to install postgres on FreeBSD

PostgreSQL, also known as Postgres, is a popular open-source relational database management system (RDBMS) that is widely used by developers and organizations around the world. FreeBSD, a free and open-source operating system, is well-known for its reliability, performance, and security features. In this blog post, we will guide you through the process of installing PostgreSQL in FreeBSD. Whether you’re a developer or a system administrator, this step-by-step tutorial will help you get started with it.

Why you should not initialize a random generator with a static number

The following examples use random generated numbers initialized with a static seed. Never do it like this. Run the following examples multiple times to understand why it is important to have a good seed. PHP version: #!/usr/bin/php <?php srand(2); echo rand(0,10)."\n"; echo rand(0,5)."\n"; echo rand(0,4)."\n"; echo rand(0,6)."\n"; Java version: import java.util.*; /** * @see */ public class RandomDemo { public static void main( String args[] ){ Random r = new Random(2); System.

Common tasks when working with MySQL

How to install MySQL server in Ubuntu It’s pretty simple: sudo apt-get install mysql-server How to connect to MySQL using Java This is a useful and simple snippet: import java.sql.Connection; import java.sql.DriverManager; public class Test { public static void main(String[] args) { try { Class.forName("com.mysql.jdbc.Driver"); Connection c = DriverManager.getConnection( "jdbc:mysql://localhost/?user=root&password="); c.close(); System.out.println("Success"); } catch (Exception e) { e.printStackTrace(); } } } How to connect to MySQL using C# Go to http://www.

Recommended libraries for Java

This article lists a curated list of Java libraries that I have used over the years for different projects. They are all well documented, and for most of them, plenty of examples can be found on the web. Apache Commons Email Commons Email Commons Email aims to provide a API for sending email. It is built on top of the Java Mail API, which it aims to simplify. User Guide Apache Commons StringUtils <dependency> <groupId>org.

Running Pentaho Data Integration on Mac OSX

Run Pentaho Data Integration on Mac OSX. The following procedure works with all the latest OSX versions. My local configuration OSX Mojave OpenJDK 11 Procedure Download from Unzip it Using the terminal, cd into the unzipped directory Run the application open Data\ If you get the following error: LSOpenURLsWithRole() failed with error -10810 for the file Data then run the following command (it is permissions related):

PlayFramework – Java

So far I have really liked this concept. The only con is that some times is difficult to find full examples that use the latest version. Installing sbt We need sbt for compiling and running Play applications. brew install sbt@1 Executing a first application Check the tutorials page to see how to create a first project. Pretty much: sbt new playframework/play-java-seed.g8 sbt run And then visit localhost:9000 Play 2.

How to run a custom update using Java JPA

From time to time it is necessary to execute a query without using Java’s JPA infrastructure. In order to do it, we have to define a NamedQuery to execute. In this example, I will run an update against the database. @Entity @NamedQueries ({ @NamedQuery ( name = "SomeEntity.TestQuery", query = "update SomeEntity se set se.myField = '' where = 0" ) }) public class SomeEntity implements Serializable { // .

Quick lessons on working with Java’s BigDecimal

Today I bring an example of the different results you can expect when using Java’s BigDecimal class. From instantiation to applying different arithmetic operations, it is important to understand how they affect the resulting instances. The following program shows different scenarios and results applied to BigDecimal’s. package test; import java.math.BigDecimal; import java.math.RoundingMode; public class Test { public static void main(String[] args) { BigDecimal a = new BigDecimal("1.204165"); System.out.println("a (from string): " + a); // 1.

Read all tables and columns from a database using Java

This Java example finds all the tables and their corresponding columns from a database. The code iterates over the entities and columns found and shows them on the console. Minor changes are necessary to process the found values in a different way. Connection conn; DatabaseMetaData dmd; ResultSet rs1, rs2; ResultSetMetaData rsmd; Statement s; try { conn = getConnection(); dmd = conn.getMetaData(); rs1 = dmd.getTables("database_name", null, "%", null); s = conn.createStatement(); while (rs1.