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@Scope(ScopeType.PROTOTYPE)
@Provider
public class MyProvider implements MessageBodyReader<String>{
    ...
}

Singleton Example 1

The following example shows how to define a provider with a singleton lifecycle.

@Scope(ScopeType.SINGELTON)
@Provider
public class MyProvider implements MessageBodyReader<String>{
    ...
}

Singleton Example 2

The following example shows that when the @Scope annotation is not used, the provider will be a singleton, as per the JAX-RS specification.

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