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23 
24 /*
25  * @test
26  * @bug 6989440
27  * @summary Verify ConcurrentModificationException is not thrown with multiple
28  *     thread accesses.
29  * @modules java.base/sun.util.locale.provider
30  * @compile -XDignore.symbol.file=true Bug6989440.java
31  * @run main Bug6989440
32  */
33 import java.text.spi.DateFormatProvider;
34 import java.util.spi.LocaleNameProvider;
35 import java.util.spi.LocaleServiceProvider;
36 import java.util.spi.TimeZoneNameProvider;
37 
38 import sun.util.locale.provider.LocaleServiceProviderPool;
39 
40 public class Bug6989440 {
41     static volatile boolean failed;  // false
42     static final int THREADS = 50;
43 
main(String[] args)44     public static void main(String[] args) throws Exception {
45         Thread[] threads = new Thread[THREADS];
46         for (int i=0; i<threads.length; i++)
47             threads[i] = new TestThread();
48         for (int i=0; i<threads.length; i++)
49             threads[i].start();
50         for (int i=0; i<threads.length; i++)
51             threads[i].join();
52 
53         if (failed)
54             throw new RuntimeException("Failed: check output");
55     }
56 
57     static class TestThread extends Thread {
58         private Class<? extends LocaleServiceProvider> cls;
59         private static int count;
60 
TestThread(Class<? extends LocaleServiceProvider> providerClass)61         public TestThread(Class<? extends LocaleServiceProvider> providerClass) {
62             cls = providerClass;
63         }
64 
TestThread()65         public TestThread() {
66             int which = count++ % 3;
67             switch (which) {
68                 case 0 : cls = LocaleNameProvider.class; break;
69                 case 1 : cls = TimeZoneNameProvider.class; break;
70                 case 2 : cls = DateFormatProvider.class; break;
71                 default : throw new AssertionError("Should not reach here");
72             }
73         }
74 
run()75         public void run() {
76             try {
77                 LocaleServiceProviderPool pool = LocaleServiceProviderPool.getPool(cls);
78                 pool.getAvailableLocales();
79             } catch (Exception e) {
80                 System.out.println(e);
81                 e.printStackTrace();
82                 failed = true;
83             }
84         }
85     }
86 }
87