}

            task unpackJar(type: Copy) {
                from zipTree(jar.archiveFile)
                into 'build/unzippedJar'
            }
        """
        file("src/main/java/Hello.java") << """public class Hello {}"""

        when:
        run 'unpackJar'

        then:
        executedAndNotSkipped ':jar', ':unpackJar'
    }

                handler
            );
        }

        private void walkNestedChild(Supplier<Object> unpacker, String qualifiedName, PropertyMetadata propertyMetadata, InstanceMetadataVisitor visitor, boolean isElementOfCollection, Consumer<Object> handler) {
            Object value;
            try {
                value = unpacker.get();
            } catch (Exception ex) {
                visitor.visitNestedUnpackingError(qualifiedName, ex);