1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
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7  * published by the Free Software Foundation.
8  *
9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
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17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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22  */
23 
24 /*
25  * @test
26  * @modules java.base/jdk.internal.misc
27  * @library /test/lib ..
28  * @build sun.hotspot.WhiteBox
29  * @compile/module=java.base java/lang/ModuleHelper.java
30  * @run driver ClassFileInstaller sun.hotspot.WhiteBox
31  *                              sun.hotspot.WhiteBox$WhiteBoxPermission
32  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI JVMAddReadsModule
33  */
34 
35 import static jdk.test.lib.Asserts.*;
36 
37 public class JVMAddReadsModule {
38 
main(String args[])39     public static void main(String args[]) throws Throwable {
40         MyClassLoader from_cl = new MyClassLoader();
41         MyClassLoader to_cl = new MyClassLoader();
42         Object from_module, to_module;
43 
44         from_module = ModuleHelper.ModuleObject("from_module", from_cl, new String[] { "mypackage" });
45         assertNotNull(from_module, "Module should not be null");
46         ModuleHelper.DefineModule(from_module, false, "9.0", "from_module/here", new String[] { "mypackage" });
47 
48         to_module = ModuleHelper.ModuleObject("to_module", to_cl, new String[] { "yourpackage" });
49         assertNotNull(to_module, "Module should not be null");
50         ModuleHelper.DefineModule(to_module, false, "9.0", "to_module/here", new String[] { "yourpackage" });
51 
52         // Null from_module argument, expect NPE
53         try {
54             ModuleHelper.AddReadsModule(null, to_module);
55             throw new RuntimeException("Failed to get the expected NPE");
56         } catch (NullPointerException e) {
57             // Expected
58         }
59 
60         // Null to_module argument, expect NPE
61         try {
62             ModuleHelper.AddReadsModule(from_module, null);
63             throw new RuntimeException("Unexpected NPE was thrown");
64         } catch (NullPointerException e) {
65             // Expected
66         }
67 
68         // Null from_module and to_module arguments, expect NPE
69         try {
70             ModuleHelper.AddReadsModule(null, null);
71             throw new RuntimeException("Failed to get the expected NPE");
72         } catch (NullPointerException e) {
73             // Expected
74         }
75 
76         // Both modules are the same, should not throw an exception
77         ModuleHelper.AddReadsModule(from_module, from_module);
78 
79         // Duplicate calls, should not throw an exception
80         ModuleHelper.AddReadsModule(from_module, to_module);
81         ModuleHelper.AddReadsModule(from_module, to_module);
82     }
83 
84     static class MyClassLoader extends ClassLoader { }
85 }
86