Resolve Circular dependency (Question asked in Coding Interview)

Lastly, I was facing interview coding question, when I realized for one use case, it was throwing "Stack Overflow Error", looking at the input I figure out that problem is linked to circular dependency.

Let me briefly walk you towards the scenarios with very simple details:

We have  service which has two method:

Service class that has 2 method

• register: In this method, we will register a new service let say proxy service.     
• add: In this method, we will add an element to a List and will also call add method of proxy Service if any.

Let me explain it with an example:

public class Service{
  private List<String> list=new ArrayList<String>();
  private Service proxyService;
  private String serviceName;

  public Service(String name){
    servicename=name; 
  } 

   public void register(Service s){
     this.proxyService=s;
   }
  
   public void add(String st){
     if(proxyService!=null){
           proxyService.add(st);
     }
     
    list.add(st);
  }
   
   public void print(){
      for(int i=0;i<list.size();i++){
        System.out.println(list.get(i));
     }
   }
}

Now, there is a use case as shown below:
Service s1=new Service("s1");
Service s2=new Service("s2");
s1.register(s2);
s2.register(s1);
s1.add("Test");
s2.add("Test2")
s1.print();

The above use case will lead to circular dependency and the error snippet as shown below:

Exception in thread "main" java.lang.StackOverflowError
at xx.Service.add(Service.java:18)
at xx.Service.add(Servicejava:22)
at xx.Service.add(Service.java:22)

Now, I tried lot of work around but nothing worked perfectly, when I resolve it with static ArrayList code as shown below:

public class Service{
  private List<String> list=new ArrayList<String>();
  private Service proxyService;
  private String serviceName;

 static List<String> isVisited = new ArrayList<String>();

  public Service(String name){
    servicename=name; 
  } 

   public void register(Service s){
     this.proxyService=s;
   }
  
   public void add(String st){
   if(!isVisited.contains(serviceName)) {

    isVisited.add(serviceName);

          if(proxyService!=null){
               proxyService.add(st);
               isVisited.clear();
           }    
           list.add(st);
       } 

 }

  public void print(){

      for(int i=0;i<list.size();i++){

        System.out.println(list.get(i));

     }

}

Now, the same above use case will print:
Service s1=new Service("s1");
Service s2=new Service("s2");
s1.register(s2);
s2.register(s1);
s1.add("Test");
s2.add("Test1);
s1.print();

Will print the output:
Test
Test1

I know my solution won't work for multi-thread approach and we need to change former design altogether for production. But, it worked pretty well for single thread environment.

I hope you are able to follow my post, if you have any better solution, please write it down in comments, I will incorporate it in my post.