--- old/test/hotspot/jtreg/runtime/appcds/jigsaw/limitmods/LimitModsTests.java	2018-04-06 15:40:41.087950607 -0700
+++ new/test/hotspot/jtreg/runtime/appcds/jigsaw/limitmods/LimitModsTests.java	2018-04-06 15:40:40.802923728 -0700
@@ -150,14 +150,16 @@
                     }
                 }
             }
-            output = TestCommon.exec(
-                appJar + File.pathSeparator + helperJar,
+            TestCommon.run(
+                "-cp", appJar + File.pathSeparator + helperJar,
                 "-XX:+UnlockDiagnosticVMOptions", "-XX:+WhiteBoxAPI", bootClassPath,
                 "--limit-modules", limitMods,
                 "LimitModsHelper",
                 BOOT_ARCHIVE_CLASS, PLATFORM_ARCHIVE_CLASS, APP_ARCHIVE_CLASS,
-                Integer.toString(excludeModIdx)); // last 4 args passed to test
-            output.shouldHaveExitValue(0);
+                Integer.toString(excludeModIdx)) // last 4 args passed to test
+                .assertSilentlyDisabledCDS(out -> {
+                    out.shouldHaveExitValue(0);
+                });
             limitMods = null;
         }
     }