[Opensymphony-oscache] Urgent help required: Disk caching problem

In case you want to see my original problem, here is my test case:

public class GeneralCache extends Cache {
public GeneralCache(boolean useMemoryCaching, boolean unlimitedDiskCache, boolean overflowPersistence)
    {
        super(useMemoryCaching, unlimitedDiskCache, overflowPersistence);
    }

    public void removeEntry(String key)
    {
        super.removeEntry(key);
    }

}

public class GeneralCacheTest extends TestCase {
    GeneralCache cacheObj;

    public GeneralCacheTest(String testName)
    {
        super(testName);
    }

     public static void main(String[] args)
    {
        junit.textui.TestRunner.run(suite());

    }

    public static Test suite()
    {
        TestSuite suite = new TestSuite(GeneralCacheTest.class);

        return suite;
    }

    protected void setUp() throws Exception
    {
        Properties prop = new Properties();
         prop.put("cache.memory", "true");
        prop.put("cache.blocking", "true");
        prop.put("cache.unlimited.disk", "true");
        prop.put("cache.path", "C:\\temp");
        prop.put("cache.persistence.overflow.only","true");
        prop.put("cache.persistence.class", "com.opensymphony.oscache.plugins.diskpersistence.HashDiskPersistenceListener");

      
        Config config = new Config(prop);
        PersistenceListener listener = new com.opensymphony.oscache.plugins.diskpersistence.HashDiskPersistenceListener();
        listener = listener.configure(config);
        cacheObj = new GeneralCache(true, true, true);
        cacheObj.setPersistenceListener(listener);
        cacheObj.setCapacity(1);
    }

/* test PutInCache */
    public void testPutInCache() throws Exception
    {
        int n = 4;
        String key = null;
        String value = null;

        // cache is empty now, each get will throw exception and new entry is put
        for(int i = 0; i < n; i++)
        {
            key = "key " + i;
            try
            {
                 // Get from the cache
                 value = cacheObj.getFromCache(key).toString();
                assertTrue(false); // this line shouldn't be reached
            }
            catch (NeedsRefreshException nre)
            {
                 try
                 {
                     // Store in the cache
                     value = "test value " + i;
                     cacheObj.putInCache(key, value);
                 }
                catch(Exception e)
                {
                    System.out.println(e.toString());
                    cacheObj.cancelUpdate(key);
                    System.out.println("cancelUpdate called");
                }
             }
        }

}

After the test, none is saved in disk.

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