Bug 560024

Description Juergen Baier 2020-02-11 09:45:09 EST

Here is a small test program which can be compiled with javac:

$ javac --version
javac 11.0.5

but prints a compilation error with Eclipse 4.14.0:


public class CastToBoolean {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Foo foo = new FooImpl(Boolean.TRUE);

		Boolean value = foo.getAttribute();
		if (value) {
			System.out.println("this works");
		}

		if (foo.getAttribute()) { // <== Eclipse: Type mismatch: Cannot convert from Object to boolean 
			System.out.println("this does NOT work");
		}
	}

	static interface Foo {
		<R> R getAttribute();
	}

	static class FooImpl implements Foo {

		private final Object value;

		public FooImpl(Object value) {
			this.value = value;
		}

		@SuppressWarnings("unchecked")
		@Override
		public <R> R getAttribute() {
			return (R) value;
		}

	}
}

Expected behavior: The Eclipse compiler should not show an error message.