codenameone - Storage file doesn't delete - java-me

Question

I've added storage file to my codenameone application. In some event I wanna delete specific storage file and recreate it with some old filtered data and new data. It doesn't work well on deletion.
First I create method for clear storage file in StorageManager class:
public void clearData(String pStorageTable){
Storage.getInstance().deleteStorageFile(pStorageTable);
}
In other class I use this method like this:
// load all data of specific storage file
// ...
new DBManager().clearData(ThreeTrans.DB_NAME);
// write old data with filtering of specific ID and new data
// ...
here is method of write data:
public void write(ThreeTrans pTT){
if(store == null) {
store = Storage.getInstance();
}
DB_NAME = "TT";
if(!store.exists(DB_NAME)) {
Hashtable depHash = new Hashtable();
String k = "1" + pTT.getNumber();
depHash.put(k, pTT.toString());
store.writeObject(DB_NAME, depHash);
}
else {
Hashtable depHash = (Hashtable)store.readObject(DB_NAME);
if (!depHash.containsValue(pTT.getNumber())) {
String k = String.valueOf(getLastKeyNumber());
depHash.put(k, pTT.toString());
store.writeObject(DB_NAME, depHash);
}
}
}
at first I was using this method for delete storage file:
public void clearData(String pStorageTable){
if(store == null) {
store = Storage.getInstance();
}
for (String str : store.listEntries()) {
if(str.toLowerCase().startsWith(pStorageTable)) {
store.deleteStorageFile(str);
}
}
}
and after this problem this method changed to this;
public void clearData(String pStorageTable){
Storage.getInstance().deleteStorageFile(pStorageTable);
}

Answer 1

I'm assuming that you didn't invoke close() on the output stream or the input stream working with the file and there is still a lock on the file. This is usually the case for such issues.