The copy constructor is showing inspection about suspicous copy or not all field copied if you try to do a deep copy.

[alain57]

I implemented a copy constructor that needed to do a deep copy of on of acollection

neither of my classes are implementing the clonable interaface (don't need this ^^ )

Lets pretend I have follwing both classes

public class Bar {
	private int field1;
	private String field2;
	public Bar() {
	}
	
	public Bar(Bar other) {
		this.field1 = other.field1;
		this.field2 = other.field2;
	}
}

public class Foo {
	private List<Bar> bars;
	
	public Foo() {
	}
	
	public Foo(Foo other) {
		this.bars = other.bars
				.stream()
				.map(Bar::new)
				.collect(Collectors.toList());
	}
}

Basically the copy constructor of Foo is not doing any dark magic.
It makes a deep copy of the other object collection.

IMO the copy constructor of Foo class should not print any warning at all