Set proprty as value of another property

my datacollector bean has refrenc of type data with 4 different properties
<jsp:useBean id="data" class="com.custom.util.DataCollector" scope="request"/>
        <c:set target="${data}" property="IP1" value="${param.subnet1}" />
        <c:set target="${data}" property="IP2" value="${param.subnet2}" />
        <c:set target="${data}" property="IP3" value="${param.subnet3}" />
        <c:set target="${data}" property="IP4" value="${param.subnet4}" />now i want to set the data as property of another refernce. I tried this way
<jsp:useBean id="saved" class="com.custom.util.SaveData" scope="request"/>
        <c:set target="${saved}" property="DataSafe" value="${data}" />my SaveData class
package com.custom.util;
import java.util.*;
import java.io.*;
public class SaveData implements Serializable {
    ObjectOutputStream dos;
    int ip1;
    int ip2;
    int ip3;
    int ip4;
    public SaveData() {
    public void setIP1(int ip1){
        this.ip1 = ip1;
    public void setIP2(int ip2){
        this.ip2 = ip2;
    public void setIP3(int ip3){
        this.ip3 = ip3;
    public void setIP4(int ip3){
        this.ip3 = ip3;
    public void setDataSafe(SaveData sd)throws FileNotFoundException, IOException{
        dos = new ObjectOutputStream(new FileOutputStream("data.txt"));
        dos.writeObject(sd);
        dos.flush();
}and my DataCollector class
package com.custom.util;
import java.util.*;
import java.io.*;
public class DataCollector implements Serializable {
    TreeMap dataMap = new TreeMap();
    int ip1;
    int ip2;
    int ip3;
    int ip4;
    public DataCollector() {
    public void setIP1(int ip1){
        this.ip1 = ip1;
    public void setIP2(int ip2){
        this.ip2 = ip2;
    public void setIP3(int ip3){
        this.ip3 = ip3;
    public void setIP4(int ip4){
        this.ip4 = ip4;
}and i got illegalargumentexception
please help..

from ehat i could understand from the method is that my code should be like this
<jsp:useBean id="data" class="com.custom.util.DataCollector" scope="request"/>
        <c:set target="${data}" property="IP1" value="${param.subnet1}" />
        <c:set target="${data}" property="IP2" value="${param.subnet2}" />
        <c:set target="${data}" property="IP3" value="${param.subnet3}" />
        <c:set target="${data}" property="IP4" value="${param.subnet4}" />
        <jsp:useBean id="saved" class="com.custom.util.SaveData" scope="request"/>
        <c:set target="${saved}" property="dataSafe" value="${data}" />and exception i m getting because of this
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException
     org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)
root cause
java.lang.IllegalArgumentException
     sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     java.lang.reflect.Method.invoke(Method.java:597)
     org.apache.taglibs.standard.tag.common.core.SetSupport.doEndTag(SetSupport.java:154)
     org.apache.jsp.basics1.Saved_jsp._jspx_meth_c_set_0(Saved_jsp.java:139)
     org.apache.jsp.basics1.Saved_jsp._jspService(Saved_jsp.java:79)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)

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