Fix charset issues per modernizer for java 11

Author: hazendaz

src/main/java/org/apache/ibatis/migration/hook/SqlHookScript.java

@@ -21,6 +21,7 @@
 import java.io.InputStream;
 import java.io.PrintStream;
 import java.io.StringReader;
+import java.nio.charset.Charset;
 import java.nio.file.Files;
 import java.util.Map;
 import java.util.Properties;
@@ -65,7 +66,7 @@ public void execute(Map<String, Object> bindingMap) {
       while ((length = inputStream.read(buffer)) != -1) {
         outputStream.write(buffer, 0, length);
       }
-      try (StringReader reader = new StringReader(replacer.replace(outputStream.toString(charset)))) {
+      try (StringReader reader = new StringReader(replacer.replace(outputStream.toString(Charset.forName(charset))))) {
         context.executeSql(reader);
       }
     } catch (IOException e) {

src/main/java/org/apache/ibatis/migration/io/DefaultVFS.java

@@ -21,10 +21,10 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
-import java.io.UnsupportedEncodingException;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.InvalidPathException;
 import java.nio.file.Path;
 import java.util.ArrayList;
@@ -271,11 +271,7 @@ protected URL findJarForResource(URL url) throws MalformedURLException {
 
       // File name might be URL-encoded
       if (!file.exists()) {
-        try {
-          file = Path.of(URLEncoder.encode(jarUrl.toString(), "UTF-8")).toFile();
-        } catch (UnsupportedEncodingException e) {
-          throw new RuntimeException("Unsupported encoding?  UTF-8?  That's impossible.");
-        }
+        file = Path.of(URLEncoder.encode(jarUrl.toString(), StandardCharsets.UTF_8)).toFile();
       }
 
       if (file.exists()) {

src/test/java/org/apache/ibatis/migration/runtime_migration/RuntimeMigrationTest.java

@@ -24,6 +24,7 @@
 import java.math.BigDecimal;
 import java.net.URI;
 import java.net.URISyntaxException;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Path;
 import java.sql.Connection;
 import java.sql.ResultSet;
@@ -171,14 +172,14 @@ public void after(Map<String, Object> bindingMap) {
       }
     };
     new UpOperation(3).operate(connectionProvider, migrationsLoader, dbOption, printStream, hook);
-    String output = out.toString("utf-8");
+    String output = out.toString(StandardCharsets.UTF_8);
     assertEquals(1, TestUtil.countStr(output, "<BEFORE>"));
     assertEquals(3, TestUtil.countStr(output, "<BEFORE_EACH>"));
     assertEquals(3, TestUtil.countStr(output, "<AFTER_EACH>"));
     assertEquals(1, TestUtil.countStr(output, "<AFTER>"));
     out.reset();
     new DownOperation(2).operate(connectionProvider, migrationsLoader, dbOption, printStream, hook);
-    output = out.toString("utf-8");
+    output = out.toString(StandardCharsets.UTF_8);
     assertEquals(1, TestUtil.countStr(output, "<BEFORE>"));
     assertEquals(2, TestUtil.countStr(output, "<BEFORE_EACH>"));
     assertEquals(2, TestUtil.countStr(output, "<AFTER_EACH>"));