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https://issues.apache.org/jira/browse/GROOVY-11301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17820103#comment-17820103
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Jochen Theodorou commented on GROOVY-11301:
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This can also be reproduced using the compilestatic annotation. I compared the
java generated output with what we create and found that there seems to be a
difference in what we give the lambda factory. In Java we have this helper
method:
{code:Java}
private static java.lang.String lambda$main$0();
descriptor: ()Ljava/lang/String;
flags: (0x100a) ACC_PRIVATE, ACC_STATIC, ACC_SYNTHETIC
Code:
stack=1, locals=0, args_size=0
0: invokestatic #3 // Method
Test$A.m:()Ljava/lang/String;
3: areturn
LineNumberTable:
line 8: 0
{code} and a bootstrap method like this {code:Java}
#22 REF_invokeStatic
java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
Method arguments:
#23 ()Ljava/lang/Object;
#24 REF_invokeStatic Test.lambda$main$0:()Ljava/lang/String;
#25 ()Ljava/lang/String;
{code}
as can be seen, the method handle reference to the local helper method is given
to LambdaMetafactory.
What we do is:
{code:Java}
#45 REF_invokeStatic
java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
Method arguments:
#30 ()Ljava/lang/Object;
#37 REF_invokeStatic Test$A.m:()Ljava/lang/String;
#38 ()Ljava/lang/String;
{code}
which is trying to give a handle to Test.A#m() to the LambdaFactory. Since we
use the general public Lookup object access to there is forbidden. We need to
either use a lookup created from the class itself (not sure if Test is enough
or if Test.A is required) or the helper method.
> References to inaccesible methods with static compilation leads to runtime
> error
> --------------------------------------------------------------------------------
>
> Key: GROOVY-11301
> URL: https://issues.apache.org/jira/browse/GROOVY-11301
> Project: Groovy
> Issue Type: Bug
> Components: Static compilation
> Reporter: Thodoris Sotiropoulos
> Priority: Minor
> Attachments: Test$A.class, Test.class
>
>
> I have the following ill-typed program
> {code}
> import java.util.function.Supplier;
> public class Test {
> static class A {
> private static String m() { return null; }
> }
> public static void main(String[] args) {
> Supplier<String> x = A::m;
> }
> }
> {code}
> h3. Actual behaviour
> The compiler accepts the program, but I receive the following runtime error,
> because I access a private method.
> {code}
> Exception in thread "main" java.lang.IllegalAccessError: class Test tried to
> access private method 'java.lang.String Test$A.m()' (Test and Test$A are in
> unnamed module of loader 'app')
> at Test.main(groovy51.groovy:9)
> {code}
> h3. Expected behavior
> The program should have been rejected by the compiler.
> Tested against master (commit: 191231a832efd2e2fc49391c01f8d176944d68e3)
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