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POWhen and how are annotations initialized in Java? Can I control this?
 

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    <p>I have specified a custom annotation for use in Java bean-validation. I use the same annotation class for all of my fields and pass a string parameter with the name of the field, like this:</p> <pre><code>@CustomConstraint(value="name") private String name; @CustomConstraint(value="address1") private String addressLine1; </code></pre> <p>My constraint validator maintains a HashMap that maps String keys (name of field) to an Interface for my validation classes. I statically initialize this map by pairing particular field names with concrete subclasses of the interface that will be used to validate the field, like this:</p> <pre><code>private static final Map&lt;String, CustomValidatorClass&gt; fieldMapper; static { Map&lt;String, CustomValidatorClass&gt; map = new HashMap&lt;String, CustomValidatorClass&gt;(); map.put("name", new NameValidator()); map.put("address1", new Address1Validator()); fieldMapper = Collections.unmodifiableMap(map); } </code></pre> <p>My concern is that this initialization process could be quite expensive (I have dozens of fields), and that it may be initialized for every single field which I am validating. I am hoping that there is some way to specify that the annotation should be initialized once and reused, or that this is the default behavior. </p> <p>EDIT: I am using JSF 2.0 along with bean-validation, so I am not directly reading or calling these annotations. That is handled by the framework, which is why I could not determine exactly how it was operating.</p>
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    1. USKurt Koller
    1. USKurt Koller
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    1. COmaybe [this manual](http://www.jcabi.com/jcabi-aspects/jsr-303.html) can help you
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      1. USyegor256
 

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