This example shows how to wrap a Java lambdafunction to avoide any exception.

Java stream exception.java

import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Optional;
import java.util.function.Function;
import java.util.stream.Stream;

@FunctionalInterface
interface ExFunction<E, F> {
    F apply (E e) throws Throwable;
    static <E, F> Function<E, Optional<F>> wrap (ExFunction<E, F> op){
        return e -> {
            try {
                return Optional.of(op.apply(e));
            } catch (Throwable throwable) {
                System.out.println("Error");
                return Optional.empty();
            }
        };
    }
}

Stream.of("a.txt", "b.txt","/Users/ojitha/Library/Preferences/IntelliJIdea2019.2/consoles/jshell/jshell_console_1.snippet")
        .map(ExFunction.wrap(f -> Files.lines(Paths.get(f))))
        .filter(Optional::isPresent)
        .flatMap(opt -> opt.get()).forEach(System.out::println);