Why does this Java 8 lambda fail to compile?

by

Your lambda needs to be congruent with BiConsumer<String, String>. If you refer to JLS #15.27.3 (Type of a Lambda):

A lambda expression is congruent with a function type if all of the following are true:

  • […]
  • If the function type’s result is void, the lambda body is either a statement expression (ยง14.8) or a void-compatible block.

So the lambda must either be a statement expression or a void compatible block:

More Related Contents:

  1. Comparator.reversed() does not compile using lambda
  2. Java8 Lambdas vs Anonymous classes
  3. Java 8: Lambda-Streams, Filter by Method with Exception
  4. Java type inference: reference is ambiguous in Java 8, but not Java 7
  5. What is a ‘SAM type’ in Java?
  6. What is the breakdown for Java’s lambda syntax?
  7. LambdaConversionException with generics: JVM bug?
  8. Why does this generic code compile in java 8?
  9. Java 8 method reference unhandled exception
  10. How do I define a method which takes a lambda as a parameter in Java 8?
  11. Lambda expression and method overloading doubts
  12. Java 8 chained method reference?
  13. Why are Java 8 lambdas invoked using invokedynamic?
  14. Why do Consumers accept lambdas with statement bodies but not expression bodies?
  15. Why can’t I throw an exception in a Java 8 lambda expression? [duplicate]
  16. Do lambda expressions have any use other than saving lines of code?
  17. Java 8 Supplier with arguments in the constructor
  18. What is a Java 8 Lambda Expression Compiled to? [duplicate]
  19. Java idiom for lambdas with non-SAM interfaces
  20. Local variable log defined in an enclosing scope must be final or effectively final
  21. Java access bean methods with LambdaMetafactory
  22. What kind of List does Collectors.toList() return?
  23. Proper usage of Optional.ifPresent()
  24. java: Arrays.sort() with lambda expression
  25. Implied anonymous types inside lambdas
  26. Built-in Java 8 predicate that always returns true?
  27. FunctionalInterface Comparator has 2 abstract methods
  28. Group sequences of values
  29. Stream.peek() method in Java 8 vs Java 9
  30. Java 8 stream map to list of keys sorted by values

Leave a Comment