Jackson for beginners in Eclipse

let me just say that I'm still learning Java and the subtleties of Eclipse, and I come to you because I am unsure how to properly phrase my question to Google or to StackOverflow's search engine. Apologies if its infinitely trivial. I am trying to understand the process of converting JSON-format strings into objects in Java. I found following example online: ``` import java.io.IOException; import org.apache.log4j.Logger; import org.codehaus.jackson.JsonParseException; import org.codehaus.jackson.map.JsonMappingException; import org.codehaus.jackson.map.ObjectMapper;public class JsonToJavaConverter { private static Logger logger = Logger.getLogger(JsonToJavaConverter.class); public static void main(String args[]) throws JsonParseException, JsonMappingException, IOException { JsonToJavaConverter converter = new JsonToJavaConverter(); String json = "{\n" + " \"name\": \"Garima\",\n" + " \"surname\": \"Joshi\",\n" + " \"phone\": 9832734651}"; // converting JSON String to Java object converter.fromJson(json); } public Object fromJson(String json) throws JsonParseException, JsonMappingException, IOException { User garima = new ObjectMapper().readValue(json, User.class); logger.info("Java Object created from JSON String "); logger.info("JSON String : " + json); logger.info("Java Object : " + garima); return garima; } public static class User { private String name; private String surname; private long phone; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getSurname() { return surname; } public void setSurname(String surname) { this.surname = surname; } public long getPhone() { return phone; } public void setPhone(long phone) { this.phone = phone; } @Override public String toString() { return "User [name=" + name + ", surname=" + surname + ", phone=" + phone + "]"; } }} ``` Now, here's the silly part (please don't string me up for asking): ``` import org.apache.log4j.Logger; import org.codehaus.jackson.JsonParseException; import org.codehaus.jackson.map.JsonMappingException; import org.codehaus.jackson.map.ObjectMapper; ``` Are all underlined in red with Eclipses only hint, being that "The import org.apache.log4j cannot be resolved". As a newcomer to both Eclipse and Java, this leaves me absolutely dumbstruck. Could anyone please tell me what needs doing to resolve this basic issue? Deeply appreciated.