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Message: [QUOTE="Sebastian, post: 5098785"] Am 12.06.2013 01:17, schrieb Stefan Ram: Brian Goetz gives concurrency issues as the reason in his "official" State of the lambda, section 7: "It is our intent to prohibit capture of mutable local variables. The reason is that idioms like this: int sum = 0; list.forEach(e -> { sum += e.size(); }); are fundamentally serial; it is quite difficult to write lambda bodies like this that do not have race conditions. Unless we are willing to enforce—preferably at compile time—that such a function cannot escape its capturing thread, this feature may well cause more trouble than it solves." [URL]http://cr.openjdk.java.net/~briangoetz/lambda/lambda-state-4.html[/URL] [/QUOTE]