make use of try-with-resources statement

h2/src/main/org/h2/tools/RunScript.java

@@ -322,14 +322,11 @@ public class RunScript extends Tool {
             boolean continueOnError) throws SQLException {
         try {
             org.h2.Driver.load();
-            Connection conn = DriverManager.getConnection(url, user, password);
             if (charset == null) {
                 charset = StandardCharsets.UTF_8;
             }
-            try {
+            try (Connection conn = DriverManager.getConnection(url, user, password)) {
                 process(conn, fileName, continueOnError, charset);
-            } finally {
-                conn.close();
             }
         } catch (IOException e) {
             throw DbException.convertIOException(e, fileName);

h2/src/main/org/h2/value/ValueLobDb.java

@@ -133,10 +133,9 @@ public class ValueLobDb extends Value implements Value.ValueClob,
         this.fileName = createTempLobFileName(handler);
         this.tempFile = this.handler.openFile(fileName, "rw", false);
         this.tempFile.autoDelete();
-        FileStoreOutputStream out = new FileStoreOutputStream(tempFile, null, null);
         long tmpPrecision = 0;
         boolean compress = this.handler.getLobCompressionAlgorithm(Value.BLOB) != null;
-        try {
+        try (FileStoreOutputStream out = new FileStoreOutputStream(tempFile, null, null)) {
             while (true) {
                 tmpPrecision += len;
                 out.write(buff, 0, len);
@@ -150,8 +149,6 @@ public class ValueLobDb extends Value implements Value.ValueClob,
                     break;
                 }
             }
-        } finally {
-            out.close();
         }
         this.precision = tmpPrecision;
         this.tableId = 0;

h2/src/test/org/h2/test/db/TestMergeUsing.java

@@ -286,22 +286,17 @@ public class TestMergeUsing extends TestBase implements Trigger {
             String gatherResultsSQL, String expectedResultsSQL,
             int expectedRowUpdateCount) throws Exception {
         deleteDb("mergeUsingQueries");
-        Connection conn = getConnection("mergeUsingQueries");
-        Statement stat;
-        PreparedStatement prep;
-        ResultSet rs;
-        int rowCountUpdate;
 
-        try {
-            stat = conn.createStatement();
+        try (Connection conn = getConnection("mergeUsingQueries")) {
+            Statement stat = conn.createStatement();
             stat.execute(setupSQL);
 
-            prep = conn.prepareStatement(statementUnderTest);
-            rowCountUpdate = prep.executeUpdate();
+            PreparedStatement prep = conn.prepareStatement(statementUnderTest);
+            int rowCountUpdate = prep.executeUpdate();
 
             // compare actual results from SQL result set with expected results
             // - by diffing (aka set MINUS operation)
-            rs = stat.executeQuery("( " + gatherResultsSQL + " ) MINUS ( "
+            ResultSet rs = stat.executeQuery("( " + gatherResultsSQL + " ) MINUS ( "
                     + expectedResultsSQL + " )");
 
             int rowCount = 0;
@@ -319,7 +314,6 @@ public class TestMergeUsing extends TestBase implements Trigger {
             assertEquals("Expected update counts differ",
                     expectedRowUpdateCount, rowCountUpdate);
         } finally {
-            conn.close();
             deleteDb("mergeUsingQueries");
         }
     }

h2/src/test/org/h2/test/db/TestSpatial.java

@@ -877,15 +877,12 @@ public class TestSpatial extends TestBase {
                 "SELECT null, CONCAT('POINT(',A.X,' ',B.X,')')::geometry the_geom " +
                 "from system_range(0,120) A,system_range(0,10) B;");
             stat.execute("create spatial index on pt_cloud(the_geom);");
-            ResultSet rs = stat.executeQuery(
+            try (ResultSet rs = stat.executeQuery(
                     "explain select * from  PT_CLOUD " +
-                    "where the_geom && 'POINT(1 1)'");
-            try {
+                            "where the_geom && 'POINT(1 1)'")) {
                 assertTrue(rs.next());
                 assertFalse("H2 should use spatial index got this explain:\n" +
                         rs.getString(1), rs.getString(1).contains("tableScan"));
-            } finally {
-                rs.close();
             }
         }
         deleteDb("spatial");

h2/src/test/org/h2/test/synth/TestBtreeIndex.java

@@ -102,8 +102,7 @@ public class TestBtreeIndex extends TestBase {
         }
         String prefix = buff.toString().substring(0, prefixLength);
         DeleteDbFiles.execute(getBaseDir() + "/" + getTestName(), null, true);
-        Connection conn = getConnection(getTestName());
-        try {
+        try (Connection conn = getConnection(getTestName())) {
             Statement stat = conn.createStatement();
             stat.execute("CREATE TABLE a(text VARCHAR PRIMARY KEY)");
             PreparedStatement prepInsert = conn.prepareStatement(
@@ -189,8 +188,6 @@ public class TestBtreeIndex extends TestBase {
             if (rs.next()) {
                 printError(seed, "testCount:" + testCount + " " + rs.getString(1));
             }
-        } finally {
-            conn.close();
         }
         deleteDb(getTestName());
     }

h2/src/test/org/h2/test/unit/TestValue.java

@@ -121,8 +121,7 @@ public class TestValue extends TestBase {
     }
 
     private void testBinaryAndUuid() throws SQLException {
-        Connection conn = getConnection("binaryAndUuid");
-        try {
+        try (Connection conn = getConnection("binaryAndUuid")) {
             UUID uuid = UUID.randomUUID();
             PreparedStatement prep;
             ResultSet rs;
@@ -139,7 +138,6 @@ public class TestValue extends TestBase {
             rs.next();
             assertEquals(uuid, rs.getObject(1));
         } finally {
-            conn.close();
             deleteDb("binaryAndUuid");
         }
     }
@@ -356,13 +354,11 @@ public class TestValue extends TestBase {
     }
 
     private void testModulusOperator() throws SQLException {
-        Connection conn = getConnection("modulus");
-        try {
+        try (Connection conn = getConnection("modulus")) {
             ResultSet rs = conn.createStatement().executeQuery("CALL 12 % 10");
             rs.next();
             assertEquals(2, rs.getInt(1));
         } finally {
-            conn.close();
             deleteDb("modulus");
         }
     }

h2/src/tools/org/h2/build/code/SwitchSource.java

@@ -100,17 +100,14 @@ public class SwitchSource {
     }
 
     private void processFile(File f) throws IOException {
-        RandomAccessFile read = new RandomAccessFile(f, "r");
         byte[] buffer;
-        try {
+        try (RandomAccessFile read = new RandomAccessFile(f, "r")) {
             long len = read.length();
             if (len >= Integer.MAX_VALUE) {
                 throw new IOException("Files bigger than Integer.MAX_VALUE are not supported");
             }
             buffer = new byte[(int) len];
             read.readFully(buffer);
-        } finally {
-            read.close();
         }
         boolean found = false;
         // check for ## without creating a string

h2/src/tools/org/h2/build/i18n/PropertiesToUTF8.java

@@ -79,9 +79,8 @@ public class PropertiesToUTF8 {
         if (!new File(source).exists()) {
             return;
         }
-        LineNumberReader reader = new LineNumberReader(new InputStreamReader(
-                new FileInputStream(source), StandardCharsets.UTF_8));
-        try {
+        try (LineNumberReader reader = new LineNumberReader(new InputStreamReader(
+                new FileInputStream(source), StandardCharsets.UTF_8))) {
             SortedProperties prop = new SortedProperties();
             StringBuilder buff = new StringBuilder();
             String key = null;
@@ -113,8 +112,6 @@ public class PropertiesToUTF8 {
                 prop.setProperty(key, buff.toString());
             }
             prop.store(target);
-        } finally {
-            reader.close();
         }
     }
 

h2/src/tools/org/h2/dev/fs/ArchiveToolStore.java

@@ -101,8 +101,7 @@ public class ArchiveToolStore {
             buff.clear();
             buff.flip();
             ArrayList<Integer> posList = new ArrayList<>();
-            FileChannel fc = FileUtils.open(s, "r");
-            try {
+            try (FileChannel fc = FileUtils.open(s, "r")) {
                 boolean eof = false;
                 while (true) {
                     while (!eof && buff.remaining() < 512 * 1024) {
@@ -153,8 +152,6 @@ public class ArchiveToolStore {
                     }
                     printProgress(0, 50, currentSize, totalSize);
                 }
-            } finally {
-                fc.close();
             }
             int[] posArray = new int[posList.size()];
             for (int i = 0; i < posList.size(); i++) {