--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.replacements.test/src/org/graalvm/compiler/replacements/test/classfile/ClassfileBytecodeProviderTest.java	Tue Mar 12 12:12:01 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.replacements.test/src/org/graalvm/compiler/replacements/test/classfile/ClassfileBytecodeProviderTest.java	Tue Mar 12 19:17:42 2019 +0100
@@ -195,6 +195,10 @@
     }
 
     protected void checkClass(MetaAccessProvider metaAccess, SnippetReflectionProvider snippetReflection, String className) throws ClassNotFoundException {
+        if (className.equals("jdk.vm.ci.services.JVMCIClassLoaderFactory")) {
+            // JVMCIClassLoaderFactory must only be initialized by the VM
+            return;
+        }
         Class<?> c = Class.forName(className, true, getClass().getClassLoader());
         ClassfileBytecodeProvider cbp = new ClassfileBytecodeProvider(metaAccess, snippetReflection);
         for (Method method : c.getDeclaredMethods()) {
@@ -205,15 +209,21 @@
     private static void checkMethod(ClassfileBytecodeProvider cbp, MetaAccessProvider metaAccess, Executable executable) {
         ResolvedJavaMethod method = metaAccess.lookupJavaMethod(executable);
         if (method.hasBytecodes()) {
-            ResolvedJavaMethodBytecode expected = new ResolvedJavaMethodBytecode(method);
             Bytecode actual = getBytecode(cbp, method);
-            new BytecodeComparer(expected, actual).compare();
+            if (actual != null) {
+                ResolvedJavaMethodBytecode expected = new ResolvedJavaMethodBytecode(method);
+                new BytecodeComparer(expected, actual).compare();
+            }
         }
     }
 
     protected static Bytecode getBytecode(ClassfileBytecodeProvider cbp, ResolvedJavaMethod method) {
         try {
             return cbp.getBytecode(method);
+        } catch (UnsupportedClassVersionError e) {
+            // This can happen when a library containing old class files
+            // is bundled into a Graal jar (GR-12672).
+            return null;
         } catch (Throwable e) {
             throw new AssertionError(String.format("Error getting bytecode for %s", method.format("%H.%n(%p)")), e);
         }