--- old/test/jdk/jigsaw/scenarios/overlappingpackages/OverlappingPackagesTest.java	2015-10-12 09:04:58.000000000 +0300
+++ new/test/jdk/jigsaw/scenarios/overlappingpackages/OverlappingPackagesTest.java	2015-10-12 09:04:57.000000000 +0300
@@ -24,16 +24,20 @@
 /**
  * @test
  * @library ../../lib /lib/testlibrary
- * @build OverlappingPackagesTest CompilerUtils
+ * @build OverlappingPackagesTest CompilerUtils jdk.testlibrary.OutputAnalyzer
  * @run testng OverlappingPackagesTest
  * @summary Basic test to ensure that startup fails if two or more modules
- *          in the boot Layer have the same package
+ *          in the boot Layer have the same package. Startup is not supposed
+ *          to fail if there is a package name duplication with/on the unnamed
+ *          module.
  */
 
+import java.io.File;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.Arrays;
 import java.util.List;
+import java.util.regex.Pattern;
 
 import static jdk.testlibrary.ProcessTools.*;
 
@@ -41,6 +45,8 @@
 import org.testng.annotations.Test;
 import static org.testng.Assert.*;
 
+import jdk.testlibrary.OutputAnalyzer;
+
 @Test
 public class OverlappingPackagesTest {
 
@@ -50,8 +56,8 @@
     private static final Path MODS_DIR = Paths.get("mods");
 
     // the names of the modules in this test
-    private static List<String> modules = Arrays.asList("m1", "m2", "misc", "test");
-
+    private static final List<String> modules = Arrays.asList("m1", "m2",
+            "misc", "test");
 
     /**
      * Compiles all modules used by the test
@@ -75,7 +81,6 @@
                 .outputTo(System.out)
                 .errorTo(System.err)
                 .getExitValue();
-
         assertTrue(exitValue == 0);
     }
 
@@ -85,31 +90,64 @@
      * sun.misc and so should overlap with the base module.
      */
     public void testOverlapWithBaseModule() throws Exception {
-        int exitValue
+        OutputAnalyzer output
             = executeTestJava("-mp", MODS_DIR.toString(),
                               "-addmods", "misc",
                               "-m", "test/test.Main")
                 .outputTo(System.out)
-                .errorTo(System.err)
-                .getExitValue();
-
-        assertTrue(exitValue != 0);
+                .errorTo(System.err);
+        output.shouldContain("Module misc contains package sun.misc, " +
+            "module java.base exports package sun.misc to misc");
+        assertTrue(output.getExitValue() != 0);
     }
 
     /**
      * Run the test with "-addmods m1,m2". Both modules have package p.
      */
     public void testOverlap() throws Exception {
-        int exitValue
+        OutputAnalyzer output
             = executeTestJava("-mp", MODS_DIR.toString(),
                               "-addmods", "m1,m2",
                               "-m", "test/test.Main")
                 .outputTo(System.out)
+                .errorTo(System.err);
+        String errorText = "Package p in both module m. and module m.";
+        if(!Pattern.compile(errorText).matcher(output.getOutput()).find()) {
+            fail("Output does not contain expected error: \"" +
+                    errorText + "\"");
+        }
+        assertTrue(output.getExitValue() != 0);
+    }
+
+    /**
+     * Run the test with m1 being on the modulepath. m1 module has package p.
+     * Package p is also present on the classpath.
+     */
+    public void testOverlapWithClasspath() throws Exception {
+        int exitValue
+                = executeTestJava("-mp", MODS_DIR.toString(),
+                        "-classpath", MODS_DIR.resolve("m1").toString(),
+                        "-addmods", "m2",
+                        "-m", "test/test.Main")
+                .outputTo(System.out)
                 .errorTo(System.err)
                 .getExitValue();
-
-        assertTrue(exitValue != 0);
+        assertTrue(exitValue == 0);
     }
 
-
+    /**
+     * Run with package p present two times on the classpath.
+     */
+    public void testOverlapWithDupsOnClasspath() throws Exception {
+        String cp = MODS_DIR.resolve("m1").toString() + File.pathSeparator +
+                    MODS_DIR.resolve("m2");
+        int exitValue
+            = executeTestJava("-mp", MODS_DIR.toString(),
+                              "-classpath", cp,
+                              "-m", "test/test.Main")
+                .outputTo(System.out)
+                .errorTo(System.err)
+                .getExitValue();
+        assertTrue(exitValue == 0);
+    }
 }