Fix XMPP module after downgrading Smack library

Author: artembilan

spring-integration-xmpp/src/main/java/org/springframework/integration/xmpp/inbound/ChatMessageListeningEndpoint.java

@@ -22,8 +22,8 @@
 import org.jivesoftware.smack.StanzaListener;
 import org.jivesoftware.smack.XMPPConnection;
 import org.jivesoftware.smack.filter.StanzaFilter;
+import org.jivesoftware.smack.packet.ExtensionElement;
 import org.jivesoftware.smack.packet.Stanza;
-import org.jivesoftware.smack.packet.XmlElement;
 
 import org.springframework.expression.EvaluationContext;
 import org.springframework.expression.Expression;
@@ -132,9 +132,9 @@ public void processStanza(Stanza packet) {
 				if (ChatMessageListeningEndpoint.this.payloadExpression != null) {
 					EvaluationContext evaluationContextToUse = ChatMessageListeningEndpoint.this.evaluationContext;
 
-					List<XmlElement> extensions = xmppMessage.getExtensions();
+					List<ExtensionElement> extensions = xmppMessage.getExtensions();
 					if (extensions.size() == 1) {
-						XmlElement extension = extensions.get(0);
+						ExtensionElement extension = extensions.get(0);
 						evaluationContextToUse = ExpressionUtils.createStandardEvaluationContext(getBeanFactory());
 						evaluationContextToUse.setVariable("extension", extension);
 					}

spring-integration-xmpp/src/test/java/org/springframework/integration/xmpp/config/ChatMessageInboundChannelAdapterParserTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -82,7 +82,7 @@ public void testInboundAdapter() {
 		assertThat(TestUtils.getPropertyValue(adapter, "payloadExpression.expression")).isEqualTo("#root");
 		adapter.start();
 		Map asyncRecvListeners = TestUtils.getPropertyValue(connection, "asyncRecvListeners", Map.class);
-		assertThat(asyncRecvListeners.size()).isEqualTo(6);
+		assertThat(asyncRecvListeners.size()).isEqualTo(5);
 		Object lastListener = asyncRecvListeners.values().stream().reduce((first, second) -> second).get();
 		assertThat(TestUtils.getPropertyValue(lastListener, "packetFilter")).isSameAs(stanzaFilter);
 		adapter.stop();