code: @Override
      public com.ibm.websphere.cache.CacheEntry getCacheEntry(Object key) {
          final String methodName = "getCacheEntry(key)";
          return (com.ibm.websphere.cache.CacheEntry) functionNotAvailable(methodName);
      }
docs: Returns the value to which this map maps the specified key. Returns
  <tt>null</tt> if the map contains no mapping for this key. A return
  value of <tt>null</tt> does not <i>necessarily</i> indicate that the
  map contains no mapping for the key; it's also possible that the map
  explicitly maps the key to <tt>null</tt>. The <tt>containsKey</tt>
  operation may be used to distinguish these two cases.
  
  @param key key whose associated value is to be returned.
  @return the value to which this map maps the specified key, or
  <tt>null</tt> if the map contains no mapping for this key.
  
  @throws ClassCastException if the key is not of an inappropriate type for
  this map. (Currently supports only String)
  @throws NullPointerException key is <tt>null</tt> and this map does not
  not permit <tt>null</tt> keys.
  
  @see #containsKey(Object)