Returns the starting address of the memory region referenced by the provided direct
{@link Buffer} or {@code 0} if the provided buffer is not direct or if such access to direct
buffers is not supported by the platform.
<p>NOTE: This method ignores the buffer's current {@code position}.
Returns the starting address of the memory region referenced by the provided direct {@link Buffer} or {@code 0} if the provided buffer is not direct or if such access to direct buffers is not supported by the platform.
<p>NOTE: This method ignores the buffer's current {@code position}.