Allow deeper reflection for getDeclaredDeconstructors

src/java.base/share/classes/java/lang/Class.java

@@ -84,6 +84,7 @@
 import java.util.Set;
 import java.util.stream.Collectors;
 
+import jdk.internal.access.SharedSecrets;
 import jdk.internal.classfile.impl.BoundAttribute;
 import jdk.internal.constant.ConstantUtils;
 import jdk.internal.javac.PreviewFeature;
@@ -2469,7 +2470,7 @@ private Deconstructor<?>[] getDeclaredDeconstructors0(Class<?>[] params, int whi
                         ByteBuffer assembled_rvta = getAnnotationContents(rvta != null, (BoundAttribute) rvta);
 
                         for (int i = 0; i < parameterList.size(); i++) {
-                            Class<?> bindingClass = parameterList.get(i).resolveConstantDesc(MethodHandles.lookup());
+                            Class<?> bindingClass = parameterList.get(i).resolveConstantDesc(MethodHandles.privateLookupIn(this, SharedSecrets.getJavaLangInvokeAccess().implLookup()));
                             deconstructorBindings.add(new PatternBinding(
                                     currentDeconstructor,
                                     parameterNameList.get(i),

src/java.base/share/classes/java/lang/invoke/MethodHandleImpl.java

@@ -1653,6 +1653,9 @@ public MethodHandle serializableConstructor(Class<?> decl, Constructor<?> ctorTo
                 return IMPL_LOOKUP.serializableConstructor(decl, ctorToCall);
             }
 
+            @Override
+            public Lookup implLookup() { return IMPL_LOOKUP; }
+
         });
     }
 

src/java.base/share/classes/jdk/internal/access/JavaLangInvokeAccess.java

@@ -170,4 +170,7 @@ public interface JavaLangInvokeAccess {
      * This method should only be used by ReflectionFactory::newConstructorForSerialization.
      */
     MethodHandle serializableConstructor(Class<?> decl, Constructor<?> ctorToCall) throws IllegalAccessException;
+
+    // TODO: extra check if needed
+    Lookup implLookup();
 }

test/jdk/java/lang/reflect/Deconstructor/SimpleDeconstructorsTest.java

@@ -53,6 +53,7 @@ public static void main(String[] args) throws NoSuchPatternException, IllegalAcc
         testDeconstructorElementsAnnotations();
         testDeconstructorAnnotations();
         testGenericString();
+        testGetDeclaredDeconstructors_bug1();
     }
 
     public static void testGetMethods() {
@@ -167,12 +168,30 @@ public static void testGenericString() throws NoSuchPatternException{
         assertEquals(method.toGenericString(), "public pattern SimpleDeconstructorsTest$Person1(java.util.List<java.lang.Character>)");
     }
 
+    public static void testGetDeclaredDeconstructors_bug1() {
+        Deconstructor<?>[] methods = B.class.getDeclaredDeconstructors();
+
+        assertEquals(methods.length, 1);
+    }
+
     static void assertEquals(Object actual, Object expected) {
         if (!Objects.equals(expected, actual)) {
             throw new AssertionError("Expected: " + expected + ", but got: " + actual);
         }
     }
 
+    class A {
+        String s;
+        public A(String s) { this.s = s; }
+        public pattern A(String s) { match A(this.s); }
+    }
+
+    class B {
+        A a;
+        public B(A a) { this.a = a; }
+        public pattern B(A a) { match B(this.a); }
+    }
+
     public static class Person1 {
         private final String name;
         private final String username;