Jackson26xStackoverflowTest.java

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.junit.Test;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JacksonStackoverflowTest {

  private final ObjectMapper mapper = new ObjectMapper();

  @Test
  public void shouldNotStackOverflow() throws JsonProcessingException {
    List<ImmutablePair<String, Double>> list = new ArrayList<>();
    list.add(ImmutablePair.of("Hello World!", 123d));
    mapper.writeValueAsString(list);
  }
  
  public static interface Ability<T> {
    
  }
  
  public static final class ImmutablePair<L, R> implements Map.Entry<L, R>, Ability<ImmutablePair<L, R>> {
    private final L key;
    private final R value;

    public ImmutablePair(final L key, final R value) {
      super();
      this.key = key;
      this.value = value;
    }

    @Override
    public L getKey() {
      return key;
    }

    @Override
    public R getValue() {
      return value;
    }

    @Override
    public R setValue(final R value) {
      throw new UnsupportedOperationException();
    }
    
    static <L, R> ImmutablePair<L, R> of(final L left, final R right) {
      return new ImmutablePair<L, R>(left, right);
    }
  }
}