Wrap lambda which throws checked exception

checkedFunctionWrapper.java

  private <T, R> Function<T, R> wrapFunction(ThrowableFunction<T, R, Throwable> function) { 
      try {
        return function.apply(arg);
      } catch (Throwable e) {
        throw new RuntimeException(e);
      }
    };
  }
  
  @FunctionalInterface
  private interface ThrowableFunction<T, R, E extends Throwable> {
    R apply(T t) throws E;
  }

Usage: paths.stream().map(wrapFunction(Files::lines))...