param = foo.getSomthing1().getSomthig2().getSomthing3() ...

if (foo != null && foo.getSomthing1() != null && ....) {
    param = foo.getSomthing1().getSomthig2().getSomthing3() ...
}

param = foo?.getSomthing1()?.getSomthig2()?.getSomthing3() ...

public class TestClass{

    public Optional<TestClass> getSomthing1(){
        return Optional.of(this);
    }

    public Optional<TestClass> getSomthing2(){
        return Optional.of(this);
    }
}

TestClass test = new TestClass();
test.getSomthing1().ifPresent(t -> t.getSomthing2());

private Optional<String> get(First first) {
    return Optional.ofNullable(first.getSecond())
            .map(Second::getThird)
            .map(Third::getFourth)
            .map(Fourth::getString);
}

get(something).orElse("is null")

Object fooMethod(Object fooObject) {
    if (fooObject == null)
        return null;
    else
        return fooMethod(fooObject.getSomething());
}