getThrowableType

Extracts the declared throwable parameter type from an exception–handler method, when applicable.

Exception handlers may declare one of the following supported signatures:

• (event: Event, throwable: Throwable) → EVENT_AND_THROWABLE

• (throwable: Throwable) → THROWABLE_ONLY

• (event: Event) → EVENT_ONLY

This function inspects the reflective method and returns:

• the method’s second parameter (the throwable type) for EVENT_AND_THROWABLE,

• the method’s single parameter for THROWABLE_ONLY,

• null for EVENT_ONLY, since these handlers do not declare a throwable.

The returned type is always a Class<out Throwable>, and is used during exception dispatch to determine whether a handler is compatible with a particular thrown exception:

handler.throwableType.isInstance(actualThrowable)

Parameters