test/hotspot/jtreg/gc/g1/plab/lib/LogParser.java

8217385: JTREG: Clean up, make sure to close resources

     public PlabReport getEntries() {
         return report;
     }
 
     private PlabReport parseLines() throws NumberFormatException {
-        Scanner lineScanner = new Scanner(log);
-        PlabReport plabReport = new PlabReport();
-        Optional<Long> gc_id;
-        while (lineScanner.hasNextLine()) {
-            String line = lineScanner.nextLine();
-            gc_id = getGcId(line, GC_ID_PATTERN);
-            if (gc_id.isPresent()) {
-                Matcher matcher = PAIRS_PATTERN.matcher(line);
-                if (matcher.find()) {
-                    if (!plabReport.containsKey(gc_id.get())) {
-                        plabReport.put(gc_id.get(), new PlabGCStatistics());
-                    }
-                    ReportType reportType = line.contains("Young") ? ReportType.SURVIVOR_STATS : ReportType.OLD_STATS;
+        try (Scanner lineScanner = new Scanner(log)) {
+            PlabReport plabReport = new PlabReport();
+            Optional<Long> gc_id;
+            while (lineScanner.hasNextLine()) {
+                String line = lineScanner.nextLine();
+                gc_id = getGcId(line, GC_ID_PATTERN);
+                if (gc_id.isPresent()) {
+                    Matcher matcher = PAIRS_PATTERN.matcher(line);
+                    if (matcher.find()) {
+                        if (!plabReport.containsKey(gc_id.get())) {
+                            plabReport.put(gc_id.get(), new PlabGCStatistics());
+                        }
+                        ReportType reportType = line.contains("Young") ? ReportType.SURVIVOR_STATS : ReportType.OLD_STATS;
 
-                    PlabGCStatistics gcStat = plabReport.get(gc_id.get());
-                    if (!gcStat.containsKey(reportType)) {
-                        gcStat.put(reportType, new PlabInfo());
-                    }
+                        PlabGCStatistics gcStat = plabReport.get(gc_id.get());
+                        if (!gcStat.containsKey(reportType)) {
+                            gcStat.put(reportType, new PlabInfo());
+                        }
 
-                    // Extract all pairs from log.
-                    PlabInfo plabInfo = gcStat.get(reportType);
-                    do {
-                        String pair = matcher.group();
-                        String[] nameValue = pair.replaceAll(": ", ":").split(":");
-                        plabInfo.put(nameValue[0].trim(), Long.parseLong(nameValue[1]));
-                    } while (matcher.find());
+                        // Extract all pairs from log.
+                        PlabInfo plabInfo = gcStat.get(reportType);
+                        do {
+                            String pair = matcher.group();
+                            String[] nameValue = pair.replaceAll(": ", ":").split(":");
+                            plabInfo.put(nameValue[0].trim(), Long.parseLong(nameValue[1]));
+                        } while (matcher.find());
+                    }
                 }
             }
+            return plabReport;
         }
-        return plabReport;
     }
 
     private static Optional<Long> getGcId(String line, Pattern pattern) {
         Matcher number = pattern.matcher(line);
         if (number.find()) {