JDK-8043275 : interface initialization for default methods
  • Type: Bug
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: 8
  • Priority: P2
  • Status: Closed
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2014-05-15
  • Updated: 2016-08-15
  • Resolved: 2014-10-23
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8u40Fixed 9 b40Fixed
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JDK-8043190 is adding clarifications to the JVM specification on super interface initialization.
First, recursively initialize any super class, unchanged.
Then recursively initialize super interfaces that declare a non-abstract instance method in class file interface array order.

interface I
interface J extends I
class A implements J
interface K extends I
class B extends A implements K
class C implements L

order of initialization: I, J, A, K, B, L, C

In JDK8 this was accomplished by initializing any super interfaces that declare or inherit default methods when initializing all superclasses of a class being initialized.This surprises people by changing the order of superinterface initialization.