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Basic JSON-lib example
import net.sf.json.*;

public class hello {
    public static void main(String[] args) {
        String settings = "{"hello": "world"}";

        JSONObject obj = (JSONObject)JSONSerializer.toJSON(settings);
        System.out.println(obj.toString());
    }
}

javac -cp lib/json-lib-2.4-jdk15.jar hello.java

java -cp .:lib/json-lib-2.4-jdk15.jar:lib/commons-lang-2.4.jar hello

commons-beanutils-1.8.0
commons-collections-3.2.1
commons-lang.2.5
commons-logging-1.1.1
ezmorph-1.0.6

xom.1.1 (if serializing from/to XML)
oro-2.0.8 (if using the jdk13 version of the library)

import com.google.gson.Gson;

class Foo {
    private String hello;

    public String toString() {
        return "hello='" + hello + "'";
    }
}

public class hello {
    public static void main(String[] args) {
        String text = "{"hello": "world"}";

        Gson gson = new Gson();
        Foo foo = gson.fromJson(text, Foo.class);

        System.out.println(foo.toString());
        System.out.println(gson.toJson(foo));
    }
}

$ javac -cp lib/gson-2.0.jar hello.java
$ java -cp .:lib/gson-2.0.jar hello
hello='world'
{"hello":"world"}
$