8325532: serviceability/dcmd/compiler/PerfMapTest.java leaves created files in the /tmp dir.

Reviewed-by: amenkov, kevinw, lmesnik, sspitsyn

test/hotspot/jtreg/serviceability/dcmd/compiler/PerfMapTest.java

@@ -65,7 +65,13 @@ public class PerfMapTest {
         output.stderrShouldBeEmpty();
         output.stdoutShouldBeEmpty();
 
-        Assert.assertTrue(Files.exists(path), "File must exist: " + path);
+        try {
+            Assert.assertTrue(Files.exists(path), "File must exist: " + path);
+            Assert.assertTrue(Files.size(path) > 0,
+                              "File must not be empty. Possible file permission issue: " + path);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
 
         // Sanity check the file contents
         try {
@@ -79,10 +85,11 @@ public class PerfMapTest {
     }
 
     @Test
-    public void defaultMapFile() {
+    public void defaultMapFile() throws IOException {
         final long pid = ProcessHandle.current().pid();
         final Path path = Paths.get(String.format("/tmp/perf-%d.map", pid));
         run(new JMXExecutor(), "Compiler.perfmap", path);
+        Files.deleteIfExists(path);
     }
 
     @Test
@@ -96,7 +103,7 @@ public class PerfMapTest {
     }
 
     @Test
-    public void specifiedDefaultMapFile() {
+    public void specifiedDefaultMapFile() throws IOException {
         // This is a special case of specifiedMapFile() where the filename specified
         // is the same as the default filename as given in the help output. The dcmd
         // should treat this literally as the filename and not expand <pid> into
@@ -104,5 +111,6 @@ public class PerfMapTest {
         String test_dir = System.getProperty("test.dir", ".");
         Path path = Paths.get("/tmp/perf-<pid>.map");
         run(new JMXExecutor(), "Compiler.perfmap " + path.toString(), path);
+        Files.deleteIfExists(path);
     }
 }