JAXB Object when printing on console not showing value

I am doing marshalling and unmarshalling of XML.

XML i want to unmarshall and then marshall is xml:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<resources>
    <string name="app_name">Google<string>
    <string name="app_name">Facebook<string> 
    <string-array name="ranking">
        <item>one</item>
        <item>two</item>
    </string-array>
    <string-array name="non-ranking">
        <item>one</item>
        <item>two</item>
    </string-array>
</resources>

but xml is showing like this after marshalling :

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<resources>
    <string name="app_name"/>   ---- Value not showing 
    <string name="app_name"/>   ---- Value not showing 
    <string-array name="ranking">
        <item>one</item>
        <item>two</item>
    </string-array>
    <string-array name="non-ranking">
        <item>one</item>
        <item>two</item>
    </string-array>
</resources>

Here are the jaxb objects I have created :

1.ResourcesTag.java

2.StringArrayTag.java

3.StringTag.java

ResourcesTag.java :

package JX;

import java.util.List;

import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "resources")
@XmlAccessorType(XmlAccessType.FIELD)
public class ResourcesTag {

    private List<StringTag> string = null;

    private List<StringArrayTag> stringarray = null;

    @XmlElement(name = "string")
    public List<StringTag> getString() {
        return string;
    }

    public void setString(List<StringTag> string) {
        this.string = string;
    }

    @XmlElement(name = "string-array")
    public List<StringArrayTag> getStringarray() {
        return stringarray;
    }

    public void setStringarray(List<StringArrayTag> stringarray) {
        this.stringarray = stringarray;
    }

    }

StringArrayTag.java

package JX;

import java.util.List;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "string-array")
@XmlAccessorType(XmlAccessType.FIELD)
public class StringArrayTag {
    @XmlAttribute(name = "name")
    private String id2;
    @XmlElement(name = "item")
    private List<String> item = null;

    public String getId2() {
        return id2;
    }

    public void setId2(String id2) {
        this.id2 = id2;
    }

    public List<String> getItem() {
        return item;
    }

    public void setItem(List<String> item) {
        this.item = item;
    }

   }

StringTag.java :

package JX;

import java.util.List;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "string-array")
@XmlAccessorType(XmlAccessType.FIELD)
public class StringArrayTag {
    @XmlAttribute(name = "name")
    private String id2;
    @XmlElement(name = "item")
    private List<String> item = null;

    public String getId2() {
        return id2;
    }

    public void setId2(String id2) {
        this.id2 = id2;
    }

    public List<String> getItem() {
        return item;
    }

    public void setItem(List<String> item) {
        this.item = item;
    }

}

I believe my code for marshaling and marshaling is correct. so i am not posting that here.

Kindly please suggest me correct way of writing JAXB object so that this error can be eliminated.