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test/hotspot/jtreg/runtime/appcds/jvmti/InstrumentationTest.java

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@@ -180,13 +180,13 @@
         }
 
         // We use the flagFile to prevent the child process to make progress, until we have
         // attached to it.
         File f = new File(flagFile);
-        FileOutputStream o = new FileOutputStream(f);
+        try (FileOutputStream o = new FileOutputStream(f)) {
         o.write(1);
-        o.close();
+        }
         if (!f.exists()) {
             throw new RuntimeException("Failed to create " + f);
         }
 
         // At this point, the child process is not yet launched. Note that
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