Github user martin-g commented on the issue:
https://github.com/apache/wicket/pull/208
`IllegalStateException` looks good to me. The developer expects that the
page is in stateless state but it is not!
What about introducing a custom exception and pass it to the `#fail()`
method ? By default it will be thrown but the application can override the
method and log it or do whatever it finds suitable.
`if (!condition) { fail(new CustomException("A good message")) }`
and
````java
protected void fail(CustomException cx) {
throw cx;
}
```
or
````java
protected void fail(CustomException cx) {
LOG.warn("The page is not really stateful: {}", cx.getMessage(), cx);
}
```
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