| Class | Description | 
|---|---|
| Journal | 
 A persistent storage mechanism for a set of changes to a virtual file
 system. 
 | 
| Journal.Entry | 
 A journal entry represents a change to a specific virtual path. 
 | 
| JournalingFile | 
 A virtual file which wraps another virtual file and notices changes made
 to the underlying file. 
 | 
| JournalingFileSystem | 
 A virtual file system which wraps an underlying virtual file system and
 keeps a journal of changes made to the underlying file system. 
 | 
| JournalingFileSystemService | 
 A journaling file system service listener. 
 | 
| Exception | Description | 
|---|---|
| JournalException | 
 Exception for reporting problems encountered by the journaling file
 system. 
 | 
| JournalRuntimeException | 
 Exception for reporting problems encountered by the journaling file
 system. 
 |