Reinstate inadvertently removed protected method in StaxEventItemWriter

Signed-off-by: banseok1216 <bansuk1216@naver.com>

Author: banseok1216

spring-batch-infrastructure/src/main/java/org/springframework/batch/infrastructure/item/xml/StaxEventItemWriter.java

@@ -834,7 +834,7 @@ public void close(@Nullable StaxWriterCallback footerCallback, List<QName> unclo
 					footerCallback.write(footerCallbackWriter);
 				}
 				delegateEventWriter.flush();
-				endDocument();
+				endDocument(delegateEventWriter);
 			}
 			catch (IOException e) {
 				throw new ItemStreamException("Failed to write footer items", e);
@@ -893,7 +893,7 @@ private void closeStream() {
 		 * @throws XMLStreamException thrown if error occurs.
 		 */
 		@SuppressWarnings("DataFlowIssue")
-		private void endDocument() throws XMLStreamException {
+		private void writeEndRootElement() throws XMLStreamException {
 
 			// writer.writeEndDocument(); <- this doesn't work after restart
 			// we need to write end tag of the root element manually
@@ -925,4 +925,14 @@ private void setPosition(long newPosition) {
 
 	}
 
+	/**
+	 * Writes the EndDocument tag manually.
+	 * @param writer XML event writer
+	 * @throws XMLStreamException thrown if error occurs.
+	 */
+	protected void endDocument(XMLEventWriter writer) throws XMLStreamException {
+		Assert.state(this.state != null, "OutputState is not initialized");
+		this.state.writeEndRootElement();
+	}
+
 }