[GROOVY-8587] Calling super in an overridden method results in MissingMethodException when method indirectly inherited from trait

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.15
• Fix Version/s: 5.0.0-alpha-2
• Labels: traits
• Assignee: Eric Milles
• Reporter: Jonathan Cottrill
• Created: 16/May/18 15:23
• Updated: 28/Feb/24 18:35
• Resolved: 08/Sep/23 20:01

Description

Consider the following:

trait A {
    void doSomething() {
        println "A"
    }
}

trait B extends A {}

class C implements B {
    @Override
    void doSomething() {
        B.super.doSomething()
    }

    static void main(String[] args) {
        new C().doSomething()
    }
}

Although this compiles fine, a MissingMethodException is thrown at runtime:

Exception in thread "main" groovy.lang.MissingMethodException: No signature of method: static B.doSomething() is applicable for argument types: (C) values: [C@12f41634]
	at groovy.lang.MetaClassImpl.invokeStaticMissingMethod(MetaClassImpl.java:1518)
	at groovy.lang.MetaClassImpl.invokeStaticMethod(MetaClassImpl.java:1504)
	at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:921)
	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodN(ScriptBytecodeAdapter.java:181)
	at B$Trait$Helper.$static_methodMissing(Bug.groovy)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:98)
	at groovy.lang.MetaClassImpl.invokeStaticMissingMethod(MetaClassImpl.java:1516)
	at groovy.lang.MetaClassImpl.invokeStaticMethod(MetaClassImpl.java:1504)
	at org.codehaus.groovy.runtime.callsite.StaticMetaClassSite.call(StaticMetaClassSite.java:52)
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:128)
	at C.doSomething(Bug.groovy:12)
	at A$doSomething.call(Unknown Source)
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:120)
	at C.main(Bug.groovy:16)

There appears to be no way to override a method from a trait that was implemented in a "supertrait" and delegate to the original implementation.

Issue Links

• relates to: GROOVY-8854 MissingMethodException when a public method on a trait calls a static private one in a class hierarchy