package hello; import com.fasterxml.jackson.annotation.JsonIgnoreProperties; @JsonIgnoreProperties(ignoreUnknown = true) public class Message { private static long id; private static String content; public Message() { } public static long getId() { return id; } public void setId(long id) { this.id = id; } public static String getContent() { return content; } public void setContent(String content) { this.content = content; } @Override public String toString() { return "Message{" + "id='" + id + '\'' + ", content=" + content + '}'; } }