为什么Oracle Java编译器不能在这里推断出界限,但Eclipse可以？

我有这个(貌似)无辜的代码(在这里简化为这个JUnit测试用例):

import static org.hamcrest.Matchers.instanceOf;
import static org.junit.Assert.assertThat;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.function.Supplier;

import org.junit.Test;

public class GenericsTest {
    private static boolean doFail;

    private static Map createMap() {
        if (doFail) {
            throw new IllegalArgumentException();
        }
        return new HashMap<>();
    }

    public static  T get(final Callable _valueCreator, final Supplier _errorValue) {
        try {
            return _valueCreator.call();
        } catch (final Exception e) {
            return _errorValue.get();
        }
    }

    public static Map getCachedMap() {
        return get(GenericsTest::createMap, Collections::emptyMap);
    }

    @Test
    public void testSuccess() {
        doFail = false;
        assertThat(getCachedMap(), instanceOf(HashMap.class));
    }

    @Test
    public void testFail() {
        doFail = true;
        assertThat(getCachedMap(), instanceOf(Collections.EMPTY_MAP.getClass()));
    }
}

问题在于return get(GenericsTest::createMap, Collections::emptyMap):Eclipse编译器在这里看不到问题(我也是如此),愉快地编译并运行测试并成功.

但是,当我在命令行(Maven 3,在这种情况下为Oracle JDK8,但也不能直接使用javac)上编译它时,会抛出编译错误:

.../GenericsTest.java:[23,19] incompatible types: inferred type does not conform to upper bound(s)
inferred: java.util.Map
upper bound(s): java.util.Map,java.lang.Object

我认为从返回类型(Map)以及createMap(相同)的签名都应该可以推断出所需的类型 - 事实上,似乎Eclipse编译器似乎能够做到这一点.但是,JDK编译器只会推断Map并因此失败.

这是JDK错误还是Eclipse编译器错误或其他什么？