Extra boolean allocations via reflection

ReflectionAllocationTest.java

static class Foo {
    public boolean member = true;
}

@Test
public void testReflectionAllocation() throws Exception {
    Foo foo = new Foo();

    IdentityHashMap<Boolean, Void> set = new IdentityHashMap<Boolean, Void>();
    for (int i = 0; i < 100; i++) {
        // using Field.get() makes new instances
        set.put((Boolean) Foo.class.getField("member").get(foo), null);
    }
    assertEquals(100, set.size());

    set.clear();

    for (int i = 0; i < 100; i++) {
        // using Field.getBoolean() reuses the cached instances
        set.put(Foo.class.getField("member").getBoolean(foo), null);
    }
    assertEquals(1, set.size());
}