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PODependency Injection with Guice: Something that isn't covered by any tutorial
 

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    <p>i just tinkered around with <a href="http://code.google.com/p/google-guice/" rel="noreferrer">Google Guice</a> for Dependency Injection and started integrating it into my existing application. So far, so good. I have many classes which need, beside their dependencies, Strings, DataSources, et cetera. I know there are NamedBindings, but i really do not want to create an annotation for every simple String i have to pass to the constructor for each class. Then, there is a thing called AssistedInject, creating Factory implementions for me. Wow, but i still have to define the interface of the factory. Thats okay for classes which DO HAVE dependencies, but what about this example class:</p> <pre><code>public class FooBarClass { public FooBarClass(String name, String anotherOne) { // Some stuff } } </code></pre> <p>There are cases where i am in doubt how to use Guice or, more generally, DI the right way. "Often i hear: XYZ Framework is the new <strong>new</strong>." But this implicit that i have to create <strong>every</strong> instance with the DI framework.</p> <h1>Only one instance is required</h1> <p>What if i need only one instance of this class? This class has absolutly no dependencies beside two Strings. Think about a Shutdown Hook which will be instanciated only once and passed to the JVM as my Shutdown Hook. Should i create this instance with Guice? This looks very dumb to me, because there is nothing to inject, but i have to write a factory interface to pass Guide both parameters and have to create an interface for my FooBarClass to use DI.</p> <h1>Multiple instances are required</h1> <p>The same thing applies to a case where i need multiple instances of this class. No dependencies, but i have to create a bunch of boilerplate code to get nothing out of it. This seems wrong to me.</p> <p>So, how i am supposed to use DI and/or Guice?</p> <p>Thanks a lot!</p>
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