fixed RestTemplate xml content type issue

application/src/test/java/org/thingsboard/server/system/RestTemplateConvertersTest.java

@@ -0,0 +1,36 @@
+/**
+ * Copyright © 2016-2023 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.thingsboard.server.system;
+
+import lombok.extern.slf4j.Slf4j;
+import org.junit.Test;
+import org.junit.jupiter.api.Assertions;
+import org.springframework.util.ClassUtils;
+import org.springframework.web.client.RestTemplate;
+
+
+@Slf4j
+public class RestTemplateConvertersTest {
+
+    @Test
+    public void testJacksonXmlConverter() {
+        ClassLoader classLoader = RestTemplate.class.getClassLoader();
+        boolean jackson2XmlPresent = ClassUtils.isPresent("com.fasterxml.jackson.dataformat.xml.XmlMapper", classLoader);
+        Assertions.assertFalse(jackson2XmlPresent, "XmlMapper must not be present in classpath, please, exclude \"jackson-dataformat-xml\" dependency!");
+        //If this xml mapper will be present in classpath then we will get "Unsupported Media Type" in RestTemplate
+    }
+
+}