Use ExecutionContext map constructor

Use ExecutionContext map constructor to simplify
ExecutionContextRowMapper.mapRow.

Issue #3985

Author: marschall

spring-batch-core/src/main/java/org/springframework/batch/core/repository/dao/JdbcExecutionContextDao.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2018 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.
@@ -313,7 +313,6 @@ private class ExecutionContextRowMapper implements RowMapper<ExecutionContext> {
 
 		@Override
 		public ExecutionContext mapRow(ResultSet rs, int i) throws SQLException {
-			ExecutionContext executionContext = new ExecutionContext();
 			String serializedContext = rs.getString("SERIALIZED_CONTEXT");
 			if (serializedContext == null) {
 				serializedContext = rs.getString("SHORT_CONTEXT");
@@ -327,10 +326,7 @@ public ExecutionContext mapRow(ResultSet rs, int i) throws SQLException {
 			catch (IOException ioe) {
 				throw new IllegalArgumentException("Unable to deserialize the execution context", ioe);
 			}
-			for (Map.Entry<String, Object> entry : map.entrySet()) {
-				executionContext.put(entry.getKey(), entry.getValue());
-			}
-			return executionContext;
+			return new ExecutionContext(map);
 		}
 	}