Velocity Engine without init()

Question

I would like to know how Velocity Template works without initializaion.

There is no Initialization : like below

     Velocity.init();            
         OR
     VelocityEngine velocity = new VelocityEngine();
     velocity.init();

Code which runs without init():

System.out.println("Hello World from Java Source");     
VelocityContext context = new VelocityContext();
context.put( "name", new String("Velocity") );

Template template = Velocity.getTemplate("default-template.vm");        
StringWriter sw = new StringWriter();
template.merge( context, sw );
System.out.println(sw.toString());

Output :

Hello World from Java Source
Hello World from Velocity Template

Answer 1

the getTemplate method performs an initialization check and does the init if Velocity is not yet initialized.

From Velocity 1.7 Source:

 public Template getTemplate(String name, String  encoding)
            throws ResourceNotFoundException, ParseErrorException
        {
            requireInitialization();

            return (Template)
                    resourceManager.getResource(name,
                        ResourceManager.RESOURCE_TEMPLATE, encoding);
        }



 private void requireInitialization()
    {
        if (!initialized)
        {
            try
            {
                init();
            }
            catch (Exception e)
            {
                getLog().error("Could not auto-initialize Velocity", e);
                throw new RuntimeException("Velocity could not be initialized!", e);
            }
        }
    }