[GROOVY-9873] SAM type or functional interface referenced from a method is not visible from class loader

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.21, 2.5.14, 3.0.7, 4.0.0, 5.0.0-alpha-9
• Fix Version/s: 3.0.23, 4.0.23, 5.0.0-alpha-10
• Labels: indy
• Assignee: Eric Milles
• Reporter: Eric Milles
• Created: 22/Dec/20 16:20
• Updated: 29/Aug/24 18:30
• Resolved: 29/Aug/24 17:48

Description

When type checked but not statically compiled, this case of method closure or whatever is failing for Groovy 4 but works for Groovy 3 and earlier. The line set.map(x -> x.first().intValue()) is the source. GROOVY-9803 was the original issue; when broken up into separate source units, the class loader issue appears.

New test case for groovy.transform.stc.GenericsSTCTest:

    // GROOVY-9803, GROOVY-9873
    void testShouldUseMethodGenericType9() {
        // same as above but with separate source units
        config.with {
            targetDirectory = File.createTempDir()
            jointCompilationOptions = [memStub: true]
        }
        File parentDir = File.createTempDir()
        try {
            def c = new File(parentDir, 'C.groovy')
            c.write '''
                class C<T> {
                    private T t
                    C(T item) {
                        t = item
                    }
                    static <U> C<U> of(U item) {
                        new C<U>(item)
                    }
                    def <V> C<V> map(F<? super T, ? super V> func) {
                        new C<V>(func.apply(t))
                    }
                }
            '''
            def d = new File(parentDir, 'D.groovy')
            d.write '''
                class D {
                    static <W> Set<W> wrap(W o) {
                        Collections.singleton(o)
                    }
                }
            '''
            def f = new File(parentDir, 'F.groovy')
            f.write '''
                interface F<X,Y> {
                    Y apply(X x)
                }
            '''
            def g = new File(parentDir, 'G.groovy')
            g.write '''
                void test() {
                    def c = C.of(123)
                    def set = c.map(D.&wrap)
                    def num = set.map(x -> x.first().intValue())
                }
                test()
            '''

            def loader = new GroovyClassLoader(this.class.classLoader)
            def cu = new JavaAwareCompilationUnit(config, loader)
            cu.addSources(c, d, f, g)
            cu.compile()

            loader.loadClass('G').main()
        } finally {
            parentDir.deleteDir()
            config.targetDirectory.deleteDir()
        }
    }

    java.lang.IllegalArgumentException: F referenced from a method is not visible from class loader
        at java.base/java.lang.reflect.Proxy$ProxyBuilder.ensureVisible(Proxy.java:858)
        at java.base/java.lang.reflect.Proxy$ProxyBuilder.validateProxyInterfaces(Proxy.java:681)
        at java.base/java.lang.reflect.Proxy$ProxyBuilder.<init>(Proxy.java:627)
        at java.base/java.lang.reflect.Proxy$ProxyBuilder.<init>(Proxy.java:635)
        at java.base/java.lang.reflect.Proxy.lambda$getProxyConstructor$0(Proxy.java:415)
        at java.base/jdk.internal.loader.AbstractClassLoaderValue$Memoizer.get(AbstractClassLoaderValue.java:329)
        at java.base/jdk.internal.loader.AbstractClassLoaderValue.computeIfAbsent(AbstractClassLoaderValue.java:205)
        at java.base/java.lang.reflect.Proxy.getProxyConstructor(Proxy.java:413)
        at java.base/java.lang.reflect.Proxy.newProxyInstance(Proxy.java:1006)
        at org.codehaus.groovy.vmplugin.v8.IndyInterface.fromCache(IndyInterface.java:318)
        at G.test(G.groovy:4)
        at org.codehaus.groovy.vmplugin.v8.IndyInterface.fromCache(IndyInterface.java:318)
        at G.run(G.groovy:7)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:566)
        at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:112)
        at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
        at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1270)
        at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1036)
        at org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelper.java:1031)
        at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:1014)
        at org.codehaus.groovy.runtime.InvokerHelper.runScript(InvokerHelper.java:444)
        at org.codehaus.groovy.vmplugin.v8.IndyInterface.fromCache(IndyInterface.java:318)
        at G.main(G.groovy)