Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/incubator-flink/pull/113#discussion_r17056414
--- Diff:
flink-core/src/main/java/org/apache/flink/api/common/functions/util/FunctionUtils.java
---
@@ -84,4 +84,58 @@ public static boolean isLambdaFunction(Function
function) {
return false;
}
+
--- End diff --
This looks like a good way of doing it to make the code compile on Java
versions prior to 8.
Here is a suggestion to give it more speaking error messages:
When you find that the `writeReplace` method returns a `SerializedLambda`,
try to look up that class. If the lookup fails, throw an error saying something
like "User code tries to use lambdas, but framework is running with a Java
version < 8" or so.
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