[GROOVY-3989] Groovy compiler allows overriding final methods but class loading fails with java.lang.VerifyError

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 1.7.0
• Fix Version/s: 1.6.8, 1.7.1, 1.8-beta-1
• Component/s: Compiler
• Assignee: Roshan Dawrani
• Reporter: Roshan Dawrani
• Created: 11/Jan/10 02:48
• Updated: 07/Apr/10 23:47
• Resolved: 11/Jan/10 08:14

Description

The following script compiles but when run, class loading fails saying "java.lang.VerifyError: class B overrides final method"

class A {
    def foo() {}
    final def bar() {}
}
class B extends A {
    def foo() {}
    def bar() {}
}
B

If I swap the order of method definitions in class B as:

class A {
    def foo() {}
    final def bar() {}
}
class B extends A {
    def bar() {}
    def foo() {}
}
B

then it correctly gives the error message "You are not allowed to overwrite the final method bar() from class 'A'."