[GROOVY-6550] VerifyError when instantiating class that has Java 8 default method in its ancestry

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.8.9, 2.0.8, 2.1.9, 2.2.1
• Fix Version/s: 2.3.0-beta-1
• Component/s: bytecode
• Labels: compiler
• Environment: JDK 8 M8 b127
• Assignee: Jochen Theodorou
• Reporter: Marlon Pierce
• Created: 03/Feb/14 10:09
• Updated: 05/Apr/14 00:00
• Resolved: 04/Feb/14 10:12

Description

I've created a simple repro here: https://bitbucket.org/marshallpierce/java8-groovy-verifyerror

The README has full details; I'll copy a trimmed version here.

It looks like every available groovy version (1.8.9, 2.0.8, 2.1.9, 2.2.1) all have issues with generating bytecode for classes that extend interfaces that have default method implementations (new in Java 8).

Under Java 7, `./gradlew clean build` succeeds. Under Java 8, it fails with a VerifyError:

java.lang.VerifyError: (class: org/mpierce/groovy/GroovySetSubclass, method: super$1$parallelStream signature: ()Ljava/util/stream/Stream;) Illegal use of nonvirtual function call
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:259)
	at org.mpierce.groovy.GroovySetSubclassTest.class$(GroovySetSubclassTest.groovy)
	at org.mpierce.groovy.GroovySetSubclassTest.$get$$class$org$mpierce$groovy$GroovySetSubclass(GroovySetSubclassTest.groovy)
	at org.mpierce.groovy.GroovySetSubclassTest.testGroovySubclass(GroovySetSubclassTest.groovy:9)

GroovySetSubclass is a trivial subclass of HashSet. Java analogs are