--- old/src/hotspot/share/prims/jvm.cpp	2020-03-17 11:31:29.000000000 -0700
+++ new/src/hotspot/share/prims/jvm.cpp	2020-03-17 11:31:29.000000000 -0700
@@ -988,13 +988,13 @@
 enum {
   NESTMATE              = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
   HIDDEN_CLASS          = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
-  WEAK_CLASS            = java_lang_invoke_MemberName::MN_WEAK_CLASS,
+  STRONG_LOADER_LINK    = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
   ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
 };
 
 /*
  * Define a class with the specified flags that indicates if it's a nestmate,
- * hidden, or weakly referenced from class loader.
+ * hidden, or strongly referenced from class loader.
  */
 static jclass jvm_lookup_define_class(JNIEnv *env, jclass lookup, const char *name,
                                       jobject loader, const jbyte *buf, jsize len, jobject pd,
@@ -1012,7 +1012,7 @@
 
   jboolean is_nestmate = (flags & NESTMATE) == NESTMATE;
   jboolean is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
-  jboolean is_weak = (flags & WEAK_CLASS) == WEAK_CLASS;
+  jboolean is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
   jboolean vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
 
   InstanceKlass* host_class = NULL;
@@ -1026,7 +1026,7 @@
                                is_nestmate ? "with dynamic nest-host " : "non-nestmate",
                                is_nestmate ? host_class->external_name() : "",
                                is_hidden ? "hidden" : "not hidden",
-                               is_weak ? "weak" : "strong",
+                               is_strong ? "strong" : "weak",
                                vm_annotations ? "with vm annotations" : "without vm annotation");
   }
 
@@ -1038,15 +1038,15 @@
     if (is_nestmate) {
       THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
     }
-    if (is_weak) {
-      THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "weak class is only applicable for hidden classes");
+    if (!is_strong) {
+      THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
     }
     if (vm_annotations) {
       THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
     }
-    if (flags) {
+    if (flags != STRONG_LOADER_LINK) {
       THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
-                  err_msg("flag 0x%x can only be set for hidden classes", flags));
+                  err_msg("invalid flag 0x%x", flags));
     }
   }
 
@@ -1093,7 +1093,7 @@
                           host_class,
                           classData_h,
                           is_hidden,
-                          is_weak,
+                          !is_strong,
                           vm_annotations);
     defined_k = SystemDictionary::parse_stream(class_name,
                                                class_loader,