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copied!<p><em>I don't think it's possible to remove the compiler warnings</em></p> <p>The best case scenario is reducing all the errors into one like @tangens does.</p> <p>Found two forum threads that show unsuccessful answers and explains the why a bit more.</p> <ul> <li><a href="http://forums.sun.com/thread.jspa?threadID=5215278" rel="nofollow noreferrer">http://forums.sun.com/thread.jspa?threadID=5215278</a></li> <li><a href="http://forums.sun.com/thread.jspa?threadID=694354" rel="nofollow noreferrer">http://forums.sun.com/thread.jspa?threadID=694354</a></li> </ul> <p>So I put together a full example to demonstrate the issue as I see it.</p> <pre><code>import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; import java.lang.reflect.Field; import java.util.List; public class Test { @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.FIELD) public @interface Detail { String example(); } public enum ExampleEnum { FOO_BAR, HELLO_WORLD } @Detail(example = "FOO_BAR") public ExampleEnum test; public static void main(String[] args) throws SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException { populate(new Test()); } public static void populate(Object o) throws IllegalArgumentException, IllegalAccessException, SecurityException, NoSuchFieldException { final Field field = o.getClass().getField("test"); final Detail detail = field.getAnnotation(Detail.class); System.out.println("Annotation = " + detail); final String example = detail.example(); final Class<?> type = field.getType(); System.out.println("Field Class = " + type.getName()); if (List.class.isAssignableFrom(type)) { } else if (Enum.class.isAssignableFrom(type)) { Class<? extends Enum> enumType = type.asSubclass(Enum.class); // Enum is a raw type. References to generic type Enum<E> should be parameterized Enum val = Enum.valueOf(enumType, example); // 1) Enum is a raw type. References to generic type Enum<E> should be parameterized // 2) Type safety: Unchecked invocation valueOf(Class<capture#7-of ? extends Enum>, String) of the generic // method valueOf(Class<T>, String) of type Enum field.set(o, val); } } } </code></pre>

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