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    <p> An enum class cannot be constructed, its only valid instances are its enum values. That menas you have to bind a specific enum value that will be injected into whatever field or parameter of that enum type.</p> <p>Guice/GIN encourages you to use binding annotations for constants, so you can possibly inject different constant values depending on context; e.g.</p> <pre class="lang-java prettyprint-override"><code>@Named("foo") @Inject MyEnum myEnum; – bindConstant().annotatedWith(Names.named("foo")).to(MyEnum.FOO); </code></pre> <p>If you don't want to use a binding annotation (because you know you'll only ever want a single enum value throughout your app), you cannot use <code>bindConstant()</code>, but you can use <code>toInstance</code>:</p> <pre class="lang-java prettyprint-override"><code>@Inject MyEnum myEnum; … bind(MyEnum.class).toInstance(MyEnum.FOO); </code></pre> <p>This will only work in Guice though, not in GIN, which <a href="https://code.google.com/p/google-gin/wiki/GinFaq#What_bindings_don%27t_work?" rel="nofollow">doesn't have <code>toInstance</code></a>. In GIN, you have to use a <code>Provider</code> class or a <code>@Provides</code> method:</p> <pre class="lang-java prettyprint-override"><code>class MyEnumProvider implements Provider&lt;MyEnum&gt; { @Override public MyEnum get() { return MyEnum.FOO; } } … bind(MyEnum.class).toProvider(MyEnumProvider.class); </code></pre> <p>or</p> <pre class="lang-java prettyprint-override"><code>@Provides MyEnum provideMyEnum() { return MyEnum.FOO; } </code></pre> <p>Both approaches above will also work with Guice.</p>
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    1. USThomas Broyer
    1. USThomas Broyer
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    1. COThank you for your explanations. My usecase would match your second alternative without annotation. But i have no method "toInstance" on "bind(...)". Maybe this is because my "ClientModule" is an extension of "AbstractPresenterModule" (GWTP).
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    2. COAw snap! My bad, `toInstance` is not in GIN, only in Guice. In GIN you have to use a `Provider` or a `@Provides` method. Answer updated.
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