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GenericsExample illustrating what looks like a JDT bug re. inheritance? #44

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merged 1 commit into from Nov 2, 2017
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GenericsExample illustrating what looks like a JDT bug re. inheritance? #44

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26 changes: 26 additions & 0 deletions examples/maven/hello/src/main/java/ch/vorburger/nulls/examples/hello/GenericsExample.java
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package ch.vorburger.nulls.examples.hello;

import static org.eclipse.jdt.annotation.DefaultLocation.ARRAY_CONTENTS;
import static org.eclipse.jdt.annotation.DefaultLocation.FIELD;
import static org.eclipse.jdt.annotation.DefaultLocation.PARAMETER;
import static org.eclipse.jdt.annotation.DefaultLocation.RETURN_TYPE;
import static org.eclipse.jdt.annotation.DefaultLocation.TYPE_ARGUMENT;
import static org.eclipse.jdt.annotation.DefaultLocation.TYPE_BOUND;
import static org.eclipse.jdt.annotation.DefaultLocation.TYPE_PARAMETER;

import org.eclipse.jdt.annotation.NonNullByDefault;

@SuppressWarnings("unused")
@NonNullByDefault({ PARAMETER, RETURN_TYPE, FIELD, TYPE_PARAMETER, TYPE_BOUND, TYPE_ARGUMENT, ARRAY_CONTENTS })
public class GenericsExample {

private static class Parent<T> {
}

// Null constraint mismatch: The type 'T' is not a valid substitute for the type parameter '@NonNull T'
// This seems wrong, because the mouse over hover clearly shows Parent<@NonNull T> (from @NonNullByDefault) and Child<@NonNull T>
// Workaround "Child<@NonNull T>" makes it disappear, but why is this needed?
// TODO Is this https://bugs.eclipse.org/bugs/show_bug.cgi?id=522142 ?
private static class Child<T> extends Parent<T> {
}
}