'Optional' used as field or parameter type

Reports any cases in which java.util.Optional<T>, java.util.OptionalDouble, java.util.OptionalInt, java.util.OptionalLong, or com.google.common.base.Optional are used as types for fields or parameters.

Optional was designed to provide a limited mechanism for library method return types in which a clear way to represent "no result" was needed.

Using a field with the java.util.Optional type is also problematic if the class needs to be Serializable, as java.util.Optional is not serializable.

Example:

class MyClass {
  Optional<String> name; // Optional field

  // Optional parameter
  void setName(Optional<String> name) {
    this.name = name;
  }
}

Inspection Details
Available in:	IntelliJ IDEA 2023.3, Qodana for JVM 2023.3
Plugin:	Java, 233.SNAPSHOT

Last modified: 13 July 2023