Using Iterable.forEach by tunneling exception that may occur inside Consumer.

Test.java

public class Test{
	@Test
	public void test_tunnelingExecute() throws Throwable{
		try{
			tunnelingExecute(
					Arrays.asList(1, 2, 3)::forEach,
					v -> {throw new IOException();}
					);
			Assert.fail();
		} catch(IOException e){
		}
	}

	public static interface ConsumerWithException<T, E extends Throwable>{
		void accept(T value) throws E;
	}

	@SuppressWarnings("serial")
	public static class SoftenedException extends RuntimeException {
		public SoftenedException(Throwable cause) {
			super(cause);
		}
	}

	@SuppressWarnings("unchecked")
	public static <P, E extends Throwable> void tunnelingExecute(
			Consumer<Consumer<P>> term, ConsumerWithException<P, E> proc)
	throws E{
		try{
			term.accept(pr -> {
				try{
					proc.accept(pr);
				} catch(Error | RuntimeException e){
					throw e;
				} catch(Throwable e){
					throw new SoftenedException(e);
				}
			});
		} catch(SoftenedException e){
			throw (E)e.getCause();
		}
	}
}