BooleanAttribute extends ImmutableValueAttribute<Boolean,BooleanAttribute> { @Override public Boolean get() { return super.get(); } BooleanAttribute(); @Override Boolean get(); @Override String toString();  }
@Test public void test_json(){ BooleanAttribute booleanAttribute = new BooleanAttribute(); booleanAttribute.set(true); BooleanAttribute copy = ObjectMapperBuilder.build().copy(booleanAttribute); Assertions.assertEquals(true,copy.get()); }