you can build a singleton registry using for example a hashmap, so put
your config values  in registry once and get everytime you need them...

also handy are properties files  (myvariables.properties). java  supplies
an interface for reading values  out of them, in java.util.Properties

its prasad architect no need here cache;
i am giving simple example of patten proxy
implementation
please find out
import java.awt.event.*;
import com.sun.java.swing.*;
import com.sun.java.swing.event.*;
import com.sun.java.swing.text.*;
import com.sun.java.swing.border.*;

import java.awt.*;
public class ProxyDisplay extends JxFrame
{
public ProxyDisplay()
{
super("Display proxied image");
JPanel p = new JPanel();
getContentPane().add(p);
p.setLayout(new BorderLayout());
ImageProxy image = new ImageProxy("elliott.jpg",
321, 271);
p.add("Center", image);
p.add("North", new Label(" "));
p.add("West", new Label(" "));
setSize(370, 350);
setVisible(true);
}
//------------------------------------
static public void main(String[] argv)
{
new ProxyDisplay();
}
}
//==================================
class ImageProxy extends JPanel
implements Runnable
{
int height, width;
MediaTracker tracker;
Image img;
JFrame frame;
Thread imageCheck; //to monitor loading
//------------------------------------
public ImageProxy(String filename, int w, int h)
{
height = h;
width = w;

tracker = new MediaTracker(this);
img =
Toolkit.getDefaultToolkit().getImage(filename);
tracker.addImage(img, 0); //watch for image
loading

imageCheck = new Thread(this);
imageCheck.start(); //start 2nd thread
monitor

//this begins actual image loading
try{
tracker.waitForID(0,1);
}
catch(InterruptedException e){}
}
//------------------------------------
public void paint(Graphics g)
{
if (tracker.checkID(0))
{
height = img.getHeight(frame); //get height
width = img.getWidth(frame); //and width

g.setColor(Color.lightGray); //erase box
g.fillRect(0,0, width, height);
g.drawImage(img, 0, 0, this); //draw loaded
image
}
else
{
//draw box outlining image if not loaded yet
g.setColor(Color.black);
g.drawRect(1, 1, width-2, height-2);
}
}
//------------------------------------
public Dimension getPreferredSize()
{
return new Dimension(width, height);
}
//public int getWidth() {return width;}
//public int getHeight(){return height;}
//------------------------------------
public void run()
{
//this thread monitors image loading
//and repaints when done
//the 1000 msec is artifically long
//to allow demo to display with delay
try{
Thread.sleep(1000);
while(! tracker.checkID(0))
Thread.sleep(1000);
}
catch(Exception e){}
repaint();
}
}


class for jxframe

import java.awt.*;
import java.awt.event.*;
import java.util.*;

//swing classes
import com.sun.java.swing.text.*;
import com.sun.java.swing.*;
import com.sun.java.swing.event.*;


public class JxFrame extends JFrame
{
public JxFrame(String title)
{
super(title);
setCloseClick();
setLF();
}
private void setCloseClick()
{
//create window listener to respond to window
close click
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{System.exit(0);}
});
}
//------------------------------------------
private void setLF()
{
// Force SwingApp to come up in the System L&F
String laf =
UIManager.getSystemLookAndFeelClassName();
try {
UIManager.setLookAndFeel(laf);
}
catch (UnsupportedLookAndFeelException exc)
{System.err.println("Warning:
UnsupportedLookAndFeel: " + laf);}
catch (Exception exc)
{System.err.println("Error loading " + laf + ": " +
exc);
}
}
}


this is help ful for cache  proxi of perticular file or
image