diff -r d193d58ae79d -r 5afdd1100a20 src/hotspot/share/classfile/systemDictionary.cpp
--- a/src/hotspot/share/classfile/systemDictionary.cpp	Tue Jan 15 16:40:31 2019 -0500
+++ b/src/hotspot/share/classfile/systemDictionary.cpp	Tue Jan 15 22:54:09 2019 +0100
@@ -860,8 +860,15 @@
         check_constraints(d_hash, k, class_loader, false, THREAD);
 
         // Need to check for a PENDING_EXCEPTION again; check_constraints
-        // can throw and doesn't use the CHECK macro.
+        // can throw but we may have to remove entry from the placeholder table below.
         if (!HAS_PENDING_EXCEPTION) {
+          // Record dependency for non-parent delegation.
+          // This recording keeps the defining class loader of the klass (k) found
+          // from being unloaded while the initiating class loader is loaded
+          // even if the reference to the defining class loader is dropped
+          // before references to the initiating class loader.
+          loader_data->record_dependency(k);
+
           { // Grabbing the Compile_lock prevents systemDictionary updates
             // during compilations.
             MutexLocker mu(Compile_lock, THREAD);
@@ -2179,6 +2186,7 @@
     InstanceKlass* sd_check = find_class(d_hash, name, dictionary);
     if (sd_check == NULL) {
       dictionary->add_klass(d_hash, name, k);
+
       notice_modification();
     }
   #ifdef ASSERT