Java – NoSuchElementException when finding a match in the list

The following old-fashioned, simple code works normally (traversing the string list and returning true because it should match):

public boolean isMatched() {
  List<String> stringList = Arrays.asList("str1","str2","str3");
  String matchString = "str1";

  for (String str : stringList) {
    if (StringUtils.equals(str,matchString)) {
        return true;
    }
  }

  return false;
}

Now, I want to do the same thing, but use Java 8 So far, I have this:

public boolean isMatched() {
  List<String> stringList = Arrays.asList("str1","str3");
  String matchString = "str1";
  return (stringList.stream().filter(str -> StringUtils.equals(matchString,str)).findFirst().get() != null);
}

Using the second method, I received the following error:

java.util.NoSuchElementException: No value present [junit] at java.util.Optional.get(Optional.java:135)

Why do I receive this error? What should I do to solve it?

Solution

Optional. Get () is used only when you know that there are actual values If there is no value, it throws nsee, as you can see

Looks like you want it findFirst(). Ispresent (), or anymatch () as described below