Replace hardcoded charsets with StandardCharsets

Author: fmbenhassine

spring-batch-core/src/main/java/org/springframework/batch/core/DefaultJobKeyGenerator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2022 the original author or authors.
+ * Copyright 2006-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,7 +15,7 @@
  */
 package org.springframework.batch.core;
 
-import java.io.UnsupportedEncodingException;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
@@ -55,12 +55,7 @@ public String generateKey(JobParameters source) {
 				stringBuffer.append(key).append("=").append(value).append(";");
 			}
 		}
-		try {
-			return DigestUtils.md5DigestAsHex(stringBuffer.toString().getBytes("UTF-8"));
-		}
-		catch (UnsupportedEncodingException e) {
-			throw new IllegalStateException("UTF-8 encoding not available.  Fatal (should be in the JDK).");
-		}
+		return DigestUtils.md5DigestAsHex(stringBuffer.toString().getBytes(StandardCharsets.UTF_8));
 	}
 
 }

spring-batch-core/src/test/java/org/springframework/batch/core/repository/dao/JdbcJobInstanceDaoTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2008-2022 the original author or authors.
+ * Copyright 2008-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,6 +19,7 @@
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.math.BigInteger;
+import java.nio.charset.StandardCharsets;
 import java.security.MessageDigest;
 import java.util.List;
 
@@ -74,7 +75,7 @@ void testFindJobInstanceByExecution() {
 	@Test
 	void testHexing() throws Exception {
 		MessageDigest digest = MessageDigest.getInstance("MD5");
-		byte[] bytes = digest.digest("f78spx".getBytes("UTF-8"));
+		byte[] bytes = digest.digest("f78spx".getBytes(StandardCharsets.UTF_8));
 		StringBuilder output = new StringBuilder();
 		for (byte bite : bytes) {
 			output.append(String.format("%02x", bite));

spring-batch-core/src/test/java/test/jdbc/datasource/DataSourceInitializer.java

@@ -17,6 +17,7 @@
 package test.jdbc.datasource;
 
 import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 import java.util.List;
 import javax.sql.DataSource;
 
@@ -102,7 +103,7 @@ private void doExecuteScript(final Resource scriptResource) {
 			String[] scripts;
 			try {
 				scripts = StringUtils.delimitedListToStringArray(
-						stripComments(IOUtils.readLines(scriptResource.getInputStream(), "UTF-8")), ";");
+						stripComments(IOUtils.readLines(scriptResource.getInputStream(), StandardCharsets.UTF_8)), ";");
 			}
 			catch (IOException e) {
 				throw new BeanInitializationException("Cannot load script from [" + scriptResource + "]", e);