s instance.

 <p> An instance of an entity bean can call this method only
 when the instance is associated with an enterprise bean object identity, i.e.
 in the ejbActivate, ejbPassivate, ejbPostCreate, ejbRemove,
 ejbLoad, ejbStore, and business methods.

 <p><b>Note</b>: The result of this method is that same as the
 result of getEJBObject().getPrimaryKey().</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The primary key currently associated with the instance.</dd>
<dt><span class="throw