Destroy an instance no longer needed by the pool.
<p>
It is important for implementations of this method to be aware that there
is no guarantee about what state <code>obj</code> will be in and the
implementation should be prepared to handle unexpected errors.
</p>
<p>
Also, an implementation must take in to consideration that instances lost
to the garbage collector may never be destroyed.
</p>
@param key the key used when selecting the instance
@param p a {@code PooledObject} wrapping the instance to be destroyed
@throws Exception should be avoided as it may be swallowed by
the pool implementation.
Destroy an instance no longer needed by the pool. <p> It is important for implementations of this method to be aware that there is no guarantee about what state <code>obj</code> will be in and the implementation should be prepared to handle unexpected errors. </p> <p> Also, an implementation must take in to consideration that instances lost to the garbage collector may never be destroyed. </p>
@param key the key used when selecting the instance @param p a {@code PooledObject} wrapping the instance to be destroyed
@throws Exception should be avoided as it may be swallowed by the pool implementation.
@see #validateObject @see KeyedObjectPool#invalidateObject