Updating cache when file is changed.

Hi all,
I am working on a "Resource Manager" module in java. What it does is :
1. Read the configuration file from a location(proerty name/value pair).
2. Loads the file properties in a cache which holds the in a CachedHashMap as Key-Value pair
The same config file which it reads looks like this:
<config>
         <client>
                   <id>1</id>
                   <application>
                           <id>213</id>
                           <name> MyApp </name>
                           <property>
                                     <name> key1 </name>
                                      <value> value1 </value>
                           </property>
                           <property>
                                     <name> key2 </name>
                                      <value> value2 </value>
                           </property>
                    </application?
         </client>
</config>This reading from config file and storing in cache I have already implemented ..
But now I have a special requirement.. If after deploying the application, I modify the file then Resource Manager should be smart enuf to detect the change and the reloads the file , cleans the cache and updates the cache..
Can you guys please through an idea on how to achieve the same??? It has to be Server Independent... I mean no JMX..
a small small code will b more useful..
Thanks in advance
Pankaj

When you load the file, keep its timestamp. Every time you return an element from the cache check the file timestamp again. If it has changed, reload.

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Thanks! Could you give more details on how to use the second approach?
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public class Test extends JPanel{
     DefaultTableModel tm;
     JTable table;
     JScrollPane nscrollPane;
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     public Vector datavec, thvec;
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