Well, those converter beans are really weird...
In the getAsObject method you might load entities over and over via the em. So
I decided to cache them (I even have a method to check if something is dirty).
Well this cache is a inner class with a HashMap. It works well, entities get
filled into the cache and retrieved from there. BUT: Only during one page
invocation.
As soon as I enter a page later, the cache is empty... or let's say, it's even
a different cache (I logged the hashcode). This is the same problem like with
the EntityManager. It gets lost after first invocation. And the funny thing: I
even don't know how it's being reconstructed. I added a debug message to the
cache's constructor, but it gets only called once. The next times the cache
gets instantiated it overrides my constructor. This is extremely weird ^^.
However, to draw the conclusion. If you have a converter with some kind of
property
...
| @Name("theConverter")
| ...
| public class TheConverter ... {
|
| private SomeThing something = new SomeThing();
|
| public Object getAsObject(...) {
| use(something);
| ...
"something" will be a different instance for every page invocation. If you want
it to be always the same, use the Singleton pattern, so that the property class
manages its instance itself.
| ...
| //use(something); //Not like this!
| use(SomeThing.instance()); //But that way!
| public class SomeThing implements Serializable {
| private static SomeThing instance;
| public static SomeThing instance() {
| if (instance == null)
| instance = new SomeThing();
| return instance;
| }
| ....
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