12.2.1 migration - new generics introduce compilation errors

I am currently moving projects consistent with 12.2.1 (since 12.1.2.x) and the code compiles more.

I see that some types of coherence have been changed to generics and this introduces errors or type checking type mismatches.

The Live event interceptor next used to work:

Public MustInherit class MyInterceptor implements {EventInterceptor < EntryEvent >

{} public void onEvent (EntryEvent evt)

{for (be BinaryEntry: {evt.getEntrySet ())}

. . .

}

}

}

Now, he seems to have will be replaced by:

/ public abstract class MyInterceptor implements EventInterceptor < EntryEvent <? > > {}

{} public void onEvent (EntryEvent evt)

{for (be BinaryEntry: ((Set < BinaryEntry <?,? >>)) {evt.getEntrySet ())}

. . .

}

}

}

Any more elegant way to adjust this code?

This is documented somewhere in the coherence 12.2.1 release notes?

Unfortunately this is a problem with the Java compiler, more precisely how the compiler infers and 'excessively' clears type information in a type, including those of inherited types (classes / interfaces) in the absence of soft types.  That is to say: How do you treat the erasure.

Let us look at the part of the EntryEvent interface as defined by the coherence that is the origin of errors you see.

EntryEvent /public interface extends Event {}

Public game<>> getEntrySet();

}

When the parameters of type are left out a declaration of EntryEvent, which is natural when you're upgrading the source code to consistency 12.2.1 these settings did not exist before the 12.2.1, consistency the Java compiler guess essentially that:

  1. Your type of EntryEvent is using type erasure, and
  2. All types defined using parameters of type (everywhere) should be deleted.

Therefore, a statement like 'e EntryEvent'; becomes effectively;

EntryEvent/public interface extends Event {}

public Set getEntrySet();

}

as you can imagine, is not what is expected.

According to the team of Java and Java Language Specification, this is how it is supposed to work.  However as we have shown, not only in the above example, but in the examples of different basis of consistency / breeding, current "interpretation" of the specification of the Java language seems a bit harsh.  At worst we think that only the types which have been left out are deleted, certainly not all the types and certainly no inherited or supertypes.   for example: at worst the infers of EventEntry type should look like this:

EntryEvent/public interface extends Event {}

public Set getEntrySet();

}

Unfortunately, it is a little worse than that, especially when you consider that the great event interface defines the following method (where T extends Enum)

public T getType();

Unfortunately, when all soft types are deleted, what do you think of the type t becomes effectively?   If you guessed object, you're right.   But you would also correct (according to me) If you have accessed only one Enum!   So if your source using this method, you have now received warnings of Cast of the class or exceptions when you try to use the return as an Enum value

The solution, as you have discovered, is to avoid the type erasure, or tell the compiler to not erase the types.  By changing the declaration of EntryEvent to EntryEvent or EntryEvent the compiler will prevent erasure of information essentially making and deduct all the types as object or type Super correct, for example: Enum instead of the object.

We talked at length with the team of Java on this subject, including raise a fault against the OpenJDK (where such a fix should be applied).  Unfortunately the fix can break a wider range of the code in the Java community, and so we are unfortunate to have to walk around the anomaly of Java or adding (to avoid erasing type) or add casts.

Technically, it is not a question of coherence, but in this case the corner, we hit with the consistent input event.

The bottom line seems to be: If you want to use generic drugs, you need to do it everywhere, especially to be safe and avoid possible compiler problems, who are still kicking on (since Java 5!).

Sorry I don't have a better answer.

-Brian

Architect | The Oracle coherence

PS: I'll take a look at the release notes.   He should be here... because I wrote the note of specific version on this issue.

Tags: Fusion Middleware

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