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public class CountableSet<T> implements Serializable {
    @JsonProperty()
    private Map<T, Long> counterMap;
    @JsonIgnore
    private long size;
 
    @JsonCreator
    public CountableSet(Map<T, Long> counterMap) {
        this.counterMap = counterMap;
        size = counterMap.size();
    }
 
    @JsonIgnore
    public long getSize() {
        return size;
    }
}

Main.java:1: error: class CountableSet is public, should be declared in a file named CountableSet.java
public class CountableSet<T> implements Serializable {
       ^
Main.java:1: error: cannot find symbol
public class CountableSet<T> implements Serializable {
                                        ^
  symbol: class Serializable
Main.java:3: error: cannot find symbol
    private Map<T, Long> counterMap;
            ^
  symbol:   class Map
  location: class CountableSet<T>
  where T is a type-variable:
    T extends Object declared in class CountableSet
Main.java:8: error: cannot find symbol
    public CountableSet(Map<T, Long> counterMap) {
                        ^
  symbol:   class Map
  location: class CountableSet<T>
  where T is a type-variable:
    T extends Object declared in class CountableSet
Main.java:2: error: cannot find symbol
    @JsonProperty()
     ^
  symbol:   class JsonProperty
  location: class CountableSet<T>
  where T is a type-variable:
    T extends Object declared in class CountableSet
Main.java:4: error: cannot find symbol
    @JsonIgnore
     ^
  symbol:   class JsonIgnore
  location: class CountableSet<T>
  where T is a type-variable:
    T extends Object declared in class CountableSet
Main.java:7: error: cannot find symbol
    @JsonCreator
     ^
  symbol:   class JsonCreator
  location: class CountableSet<T>
  where T is a type-variable:
    T extends Object declared in class CountableSet
Main.java:13: error: cannot find symbol
    @JsonIgnore
     ^
  symbol:   class JsonIgnore
  location: class CountableSet<T>
  where T is a type-variable:
    T extends Object declared in class CountableSet
8 errors

Standard output is empty