This PR is related to the article BAEL-6878 (#15057)

* Update pom.xml

This commit aims to add additional required dependencies:

        <dependency>
            <groupId>org.apache.xmlbeans</groupId>
            <artifactId>xmlbeans</artifactId>
            <version>5.0.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.12.4</version>
        </dependency>

* This commit is related to the article BAEL-6878

This commit aims to add the "log4j2.xml" file to the resources folder.

* This commit is related to the article BAEL-6878 

This commit aims to add a new test class named "XMLObjectToStringUnitTest" that suggests several approaches to convert XML objects to a Java string

xml-2/pom.xml

@@ -46,6 +46,16 @@
             <artifactId>underscore</artifactId>
             <version>${underscore.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.apache.xmlbeans</groupId>
+            <artifactId>xmlbeans</artifactId>
+            <version>5.0.2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-core</artifactId>
+            <version>2.12.4</version>
+        </dependency>
     </dependencies>
 
     <build>
@@ -74,4 +84,4 @@
         <underscore.version>1.89</underscore.version>
     </properties>
 
-</project>
+</project>

xml-2/src/main/resources/log4j2.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Configuration status="WARN">
+  <Appenders>
+    <Console name="Console" target="SYSTEM_OUT">
+      <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
+    </Console>
+  </Appenders>
+  <Loggers>
+    <Root level="error">
+      <AppenderRef ref="Console"/>
+    </Root>
+  </Loggers>
+</Configuration>

xml-2/src/test/java/com/baeldung/xml/xml2string/XMLObjectToStringUnitTest.java

@@ -0,0 +1,87 @@
+package com.baeldung.xml2string;
+
+import org.apache.xmlbeans.XmlException;
+import org.apache.xmlbeans.XmlObject;
+import org.apache.xmlbeans.XmlOptions;
+import org.junit.Test;
+import org.junit.Before;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.dom.DOMSource;
+import javax.xml.transform.stream.StreamResult;
+import java.io.StringWriter;
+
+import static org.junit.Assert.assertTrue;
+
+public class XMLObjectToStringUnitTest {
+    private Document document;
+
+    @Before
+    public void setup() throws ParserConfigurationException {
+// Create a DocumentBuilder
+        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
+        DocumentBuilder builder = factory.newDocumentBuilder();
+
+// Create a new Document
+        document = builder.newDocument();
+
+// Create the root element
+        Element rootElement = document.createElement("root");
+        document.appendChild(rootElement);
+
+// Create child elements
+        Element childElement1 = document.createElement("child1");
+        Element childElement2 = document.createElement("child2");
+
+// Add text content to the child elements
+        childElement1.appendChild(document.createTextNode("This is child element 1"));
+        childElement2.appendChild(document.createTextNode("This is child element 2"));
+
+// Append child elements to the root element
+        rootElement.appendChild(childElement1);
+        rootElement.appendChild(childElement2);
+    }
+
+    @Test
+    public void givenXMLDocument_whenUsingTransformer_thenConvertXMLToString() throws TransformerException {
+        TransformerFactory transformerFactory = TransformerFactory.newInstance();
+        Transformer transformer = transformerFactory.newTransformer();
+        StringWriter stringWriter = new StringWriter();
+        transformer.transform(new DOMSource(document), new StreamResult(stringWriter));
+        String result = stringWriter.toString();
+
+        assertTrue(result.contains("<root>"));
+        assertTrue(result.contains("This is child element 1"));
+        assertTrue(result.contains("This is child element 2"));
+    }
+
+    @Test
+    public void givenXMLDocument_whenUsingXmlBeans_thenConvertXMLToString() {
+        try {
+
+            XmlObject xmlObject = XmlObject.Factory.parse(document);
+
+            XmlOptions options = new XmlOptions();
+            options.setSavePrettyPrint();
+            options.setUseDefaultNamespace();
+            options.setSaveAggressiveNamespaces();
+
+            String xmlString = xmlObject.xmlText(options);
+
+            xmlString = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>" + xmlString;
+
+            assertTrue(xmlString.contains("<root>"));
+            assertTrue(xmlString.contains("This is child element 1"));
+            assertTrue(xmlString.contains("This is child element 2"));
+        } catch (XmlException e) {
+            e.printStackTrace();
+        }
+    }
+}