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23 
24 /*
25  * @test SuperDependsTest
26  * @bug 8210094
27  * @summary Create ClassLoader dependency from initiating loader to class loader through subclassing
28  * @requires vm.opt.final.ClassUnloading
29  * @modules java.base/jdk.internal.misc
30  *          java.compiler
31  * @library /runtime/testlibrary /test/lib
32  * @build sun.hotspot.WhiteBox
33  * @compile p2/c2.java MyDiffClassLoader.java
34  * @run driver ClassFileInstaller sun.hotspot.WhiteBox
35  * @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -Xlog:class+unload -XX:+WhiteBoxAPI SuperDependsTest
36  */
37 import sun.hotspot.WhiteBox;
38 import p2.*;
39 
40 public class SuperDependsTest {
41     public static WhiteBox wb = WhiteBox.getWhiteBox();
42     public static final String MY_TEST = "SuperDependsTest$c1s";
43 
44 
45     // p2.c2 loads through super class and creates dependency
46     public static class c1s extends p2.c2 {
47 
test()48         private void test() throws Exception {
49             method2();
50         }
51 
c1s()52         public c1s () throws Exception {
53             test();
54             ClassUnloadCommon.triggerUnloading();  // should not unload anything
55             test();
56         }
57     }
58 
test()59     public void test() throws Throwable {
60 
61         // now use the same loader to load class MyTest
62         Class MyTest_class = new MyDiffClassLoader(MY_TEST).loadClass(MY_TEST);
63 
64         // Call MyTest to load p2.c2 twice and call p2.c2.method2
65         MyTest_class.newInstance();
66         ClassUnloadCommon.triggerUnloading();  // should not unload anything
67         ClassUnloadCommon.failIf(!wb.isClassAlive(MY_TEST), "should not be unloaded");
68         ClassUnloadCommon.failIf(!wb.isClassAlive("p2.c2"), "should not be unloaded");
69         // Unless MyTest_class is referenced here, the compiler can unload it.
70         System.out.println("Should not unload anything before here because " + MyTest_class + " is still alive.");
71     }
72 
main(String args[])73     public static void main(String args[]) throws Throwable {
74         SuperDependsTest d = new SuperDependsTest();
75         d.test();
76         ClassUnloadCommon.triggerUnloading();  // should not unload anything
77         System.out.println("Should unload MyTest and p2.c2 just now");
78         ClassUnloadCommon.failIf(wb.isClassAlive(MY_TEST), "should be unloaded");
79         ClassUnloadCommon.failIf(wb.isClassAlive("p2.c2"), "should be unloaded");
80     }
81 }
82