The basic rule is: never – swing internals will take care of it. The basic exception to the rule is adding/removing components at runtime or changes which effect layout in ways the system can’t know or for some reason doesn’t want to react to. While the exception is not very clearcut, it’s infrequency in “normal” … Read more
At least on Windows 7, it seems that attempting to open a volume handle without FILE_SHARE_WRITE sharing permissions causes the file system cache to be invalidated, even if the creation fails. Thus I made a program that simply calls CreateFile to this end. Download the program* from its Base64 version here: <!– Click “Run Snippet”, … Read more
Each class which is derived from the View class has the invalidate and the postInvalidate method. If invalidate gets called it tells the system that the current view has changed and it should be redrawn as soon as possible. As this method can only be called from your UIThread another method is needed for when … Read more
There are two levels of caches: 1st level is the EntityManager’s own cache. You can either refresh on one entity and it will be reloaded form the database, or you can clear the entity manager itself, in which case all entities are removed from the cache. There is no way with JPA to evict only … Read more