guava/src/com/google/common/collect/ImmutableBiMap.java
@CanIgnoreReturnValue
  @Deprecated
  @Override
  public V forcePut(K key, V value) {
    throw new UnsupportedOperationException();
  }
@CanIgnoreReturnValue
  @Deprecated
  @Override
  public V forcePut(K key, V value) {
    throw new UnsupportedOperationException();
  }
@ CanIgnoreReturnValue @ Deprecated @ Override public V forcePut ( K key , V value ) { throw new UnsupportedOperationException ( ) ; }
Guaranteed to throw an exception and leave the bimap unmodified.

@throws UnsupportedOperationException always
@deprecated Unsupported operation.
Guaranteed to throw an exception and leave the bimap unmodified .