diff -r 93996c47d36f -r 514c73a1955b test/hotspot/jtreg/runtime/appcds/jigsaw/PatchModule/Simple.java
--- a/test/hotspot/jtreg/runtime/appcds/jigsaw/PatchModule/Simple.java	Thu Feb 15 09:22:25 2018 -0800
+++ b/test/hotspot/jtreg/runtime/appcds/jigsaw/PatchModule/Simple.java	Wed Feb 14 07:08:25 2018 -0800
@@ -70,12 +70,12 @@
                 "PatchMain", "javax.naming.spi.NamingManager");
         TestCommon.checkDump(output, "Loading classes to share");
 
-        output = TestCommon.execCommon(
+        TestCommon.run(
             "-XX:+UnlockDiagnosticVMOptions",
             "--patch-module=java.naming=" + moduleJar,
             "-Xlog:class+load",
             "-Xlog:class+path=info",
-            "PatchMain", "javax.naming.spi.NamingManager");
-        TestCommon.checkExec(output, "I pass!");
+            "PatchMain", "javax.naming.spi.NamingManager")
+          .assertNormalExit("I pass!");
     }
 }