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

*** 141,152 ****
                  this.implIsInstanceMethod = true;
                  break;
              case REF_invokeSpecial:
                  // JDK-8172817: should use referenced class here, but we don't know what it was
                  this.implClass = implInfo.getDeclaringClass();
-                 this.implKind = REF_invokeSpecial;
                  this.implIsInstanceMethod = true;
                  break;
              case REF_invokeStatic:
              case REF_newInvokeSpecial:
                  // JDK-8172817: should use referenced class here for invokestatic, but we don't know what it was
                  this.implClass = implInfo.getDeclaringClass();
--- 141,160 ----
                  this.implIsInstanceMethod = true;
                  break;
              case REF_invokeSpecial:
                  // JDK-8172817: should use referenced class here, but we don't know what it was
                  this.implClass = implInfo.getDeclaringClass();
                  this.implIsInstanceMethod = true;
+ 
+                 // invokespecial should only be used to invoke private nestmate constructors.
+                 // For private nestmate instance methods, it should use invokevirtual or
+                 // invokeinterface; otherwise, the generated class may fail verification.
+                 if (targetClass.isNestmateOf(implClass) && !implInfo.getName().equals("<init>")) { 
+                     this.implKind = implClass.isInterface() ? REF_invokeInterface : REF_invokeVirtual;
+                 } else {
+                     this.implKind = REF_invokeSpecial;
+                 }
                  break;
              case REF_invokeStatic:
              case REF_newInvokeSpecial:
                  // JDK-8172817: should use referenced class here for invokestatic, but we don't know what it was
                  this.implClass = implInfo.getDeclaringClass();