Invalid lambda deserialization

Question

The Eclipse JDT compiler appears to have a problem whereby, under certain circumstances, Java 8 lamdas are not deserializing correctly and instead throw an IllegalArgument

Answer 1

It's caused by this bug with the JDT compiler's handling of anonymous inner classes inside lamda expressions:

"The problem here is that during generation of the deserialize lambda helper method the 'name' of the inner class containing the implementation lambda method is seen as $Local$ when we ought to be using TestClass$1."

It's not been backported to Version: Luna SR2 (4.4.2) build M20141210-0900 but is verified for for 4.5 M4 I20141208-0800. I can personally confirm that this bug is fixed in:

Eclipse SDK
Version: Mars (4.5)
Build id: I20141210-2000

Update: Fixed in Luna SR2 (4.4.2)

Answer 2

Looks like this Eclipse JDT bug: https://bugs.eclipse.org/bugs/show_bug.cgi?id=439889