running Groovy on JDK9

[Jochen Theodorou]

On 13.04.2016 14:10, Alan Bateman wrote:
> On 11/04/2016 16:57, Jochen Theodorou wrote:
[...]
>>> org.codehaus.groovy.runtime.InterfaceConversionTest >
>>> testDefaultInterfaceMethodCallOnProxy FAILED
>>>     java.lang.AssertionError: java.util.Comparator/2
>>>         at
>>> java.lang.invoke.MethodHandles$Lookup.toString(java.base at 9-ea/MethodHandles.java:792)
>>>
>>>         at java.lang.String.valueOf(java.base at 9-ea/String.java:2806)
>>>         at
>>> java.lang.StringBuilder.append(java.base at 9-ea/StringBuilder.java:135)
>>>         at
>>> java.lang.invoke.MemberName.makeAccessException(java.base at 9-ea/MemberName.java:867)
>>>
>>>         at
>>> java.lang.invoke.MethodHandles$Lookup.checkAccess(java.base at 9-ea/MethodHandles.java:1642)
>>>
>>>         at
>>> java.lang.invoke.MethodHandles$Lookup.checkMethod(java.base at 9-ea/MethodHandles.java:1582)
>>>
>>>         at
>>> java.lang.invoke.MethodHandles$Lookup.getDirectMethodCommon(java.base at 9-ea/MethodHandles.java:1731)
>>>
>>>         at
>>> java.lang.invoke.MethodHandles$Lookup.getDirectMethodNoSecurityManager(java.base at 9-ea/MethodHandles.java:1725)
>>>
>>>         at
>>> java.lang.invoke.MethodHandles$Lookup.unreflectSpecial(java.base at 9-ea/MethodHandles.java:1336)
>>>
>>>         at
>>> org.codehaus.groovy.vmplugin.v7.Java7.getInvokeSpecialHandle(Java7.java:96)
>>>
>>>         at
>>> org.codehaus.groovy.runtime.ConversionHandler.invoke(ConversionHandler.java:109)
>>>
>>>         at com.sun.proxy.$Proxy47.reversed(Unknown Source)
>>>         at java_util_Comparator$reversed$0.call(Unknown Source)
>>>         at
>>> org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
>>>
>>>         at
>>> org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
>>>
>>>         at
>>> org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117)
>>>
>>>         at
>>> org.codehaus.groovy.runtime.InterfaceConversionTest.testDefaultInterfaceMethodCallOnProxy(InterfaceConversionTest.groovy:52)
>>>
>>
>> but if I see the trace correctly, this is already due to a failed
>> access check and just a secondary error, or wrong?
> I suspect there is a bug here as I think how it is possible to have a
> Lookup with this lookup mode. Are you able to establish where this
> Lookup is created and if it indeed created with only the PRIVATE mode set.

hmm... I see now... I had to do some trickery that backfires now - I 
totally forgot about this (wanted to actually).

So I call

private Lookup(Class<?> lookupClass, int allowedModes)

with PRIVATE mode set only.. exactly as you assumed. I guess, it would 
need to set the other modes as well...

What I would prefer though is a proper generic way to call a default 
method on an interface without having an implementing instance. A 
MethodHandles.lookup().in(Comperator.class) won't give me access to 
invokespecial Comperator#reversed, or am I wrong here?

bye Jochen