The biggest WTF for me was that checked exceptions are not compatible with lambdas. So any concise elegant code that Java 8+ allows you to write, with all new s

The biggest WTF for me was that checked exceptions are not compatible with lambdas. So any concise elegant code that Java 8+ allows you to write, with all new streams API and all that goodness, does not work the second you need to use any class that has checked exceptions mentioned. I couldn't believe it when I first learned about it - but it's true: https://stackoverflow.com/q/27644361/214196 https://stackoverflow.com/q/27644361/214196 I still can't believe anybody thought it's a good idea to do it this way.