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    <p>NO YOU DONT</p> <p>GUICE does not ask you to inject every single object. GUICE will try and create only injected objects. So you can @Inject objects that you want to be injected. </p> <p>On the scope bit - Scope essentially controls how your objects gets created by GUICE. When you write your own custom scope you can have a datastructure that controls the way objects are created. When you scope a class with your custom annotation, GUICE will call your scope method before creation with a Provider for that class. You can then decide if you want to create a new object or use an existing object from a datastructure (such as hashmap or something). If you want to use an existing one you get that and return the object, else you do a provider.get() and return. </p> <p>Notice this </p> <pre><code>public &lt;T&gt; Provider&lt;T&gt; scope(final Key&lt;T&gt; key, final Provider&lt;T&gt; unscoped) { return new Provider&lt;T&gt;() { public T get() { Map&lt;Key&lt;?&gt;, Object&gt; scopedObjects = getScopedObjectMap(key); @SuppressWarnings("unchecked") T current = (T) scopedObjects.get(key); if (current == null &amp;&amp; !scopedObjects.containsKey(key)) { current = unscoped.get(); scopedObjects.put(key, current); } // what you return here is going to be injected .... // in this scope object you can have a datastructure that holds all references // and choose to return that instead depending on your logic and external // dependencies such as session variable etc... return current; } }; } </code></pre> <p>Here's a tutorial ...</p> <p><a href="http://code.google.com/p/google-guice/wiki/CustomScopes" rel="nofollow">http://code.google.com/p/google-guice/wiki/CustomScopes</a></p>
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    1. POGuice: Do I have to annotate every class of an object graph with @Inject?
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    1. COThanks for the answer but the question was if I have to put the @Inject annotation on every class in the object graph. I am not asking about instantiating all these classes.
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