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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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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19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 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 jdk.test.lib.helpers.ClassFileInstaller sun.hotspot.WhiteBox
31  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI JVMAddReadsModule
32  */
33 
34 import static jdk.test.lib.Asserts.*;
35 
36 public class JVMAddReadsModule {
37 
main(String args[])38     public static void main(String args[]) throws Throwable {
39         MyClassLoader from_cl = new MyClassLoader();
40         MyClassLoader to_cl = new MyClassLoader();
41         Object from_module, to_module;
42 
43         from_module = ModuleHelper.ModuleObject("from_module", from_cl, new String[] { "mypackage" });
44         assertNotNull(from_module, "Module should not be null");
45         ModuleHelper.DefineModule(from_module, false, "9.0", "from_module/here", new String[] { "mypackage" });
46 
47         to_module = ModuleHelper.ModuleObject("to_module", to_cl, new String[] { "yourpackage" });
48         assertNotNull(to_module, "Module should not be null");
49         ModuleHelper.DefineModule(to_module, false, "9.0", "to_module/here", new String[] { "yourpackage" });
50 
51         // Null from_module argument, expect NPE
52         try {
53             ModuleHelper.AddReadsModule(null, to_module);
54             throw new RuntimeException("Failed to get the expected NPE");
55         } catch (NullPointerException e) {
56             // Expected
57         }
58 
59         // Null to_module argument, expect NPE
60         try {
61             ModuleHelper.AddReadsModule(from_module, null);
62             throw new RuntimeException("Unexpected NPE was thrown");
63         } catch (NullPointerException e) {
64             // Expected
65         }
66 
67         // Null from_module and to_module arguments, expect NPE
68         try {
69             ModuleHelper.AddReadsModule(null, null);
70             throw new RuntimeException("Failed to get the expected NPE");
71         } catch (NullPointerException e) {
72             // Expected
73         }
74 
75         // Both modules are the same, should not throw an exception
76         ModuleHelper.AddReadsModule(from_module, from_module);
77 
78         // Duplicate calls, should not throw an exception
79         ModuleHelper.AddReadsModule(from_module, to_module);
80         ModuleHelper.AddReadsModule(from_module, to_module);
81     }
82 
83     static class MyClassLoader extends ClassLoader { }
84 }
85