diff --git a/pom.xml b/pom.xml
index 8794d6e..a2491df 100644
--- a/pom.xml
+++ b/pom.xml
@@ -101,7 +101,6 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
     <dependency>
       <groupId>xml-apis</groupId>
       <artifactId>xml-apis</artifactId>
-      <!-- don't change it, leave at 1.4.01 -->
       <version>2.0.2</version>
       <scope>provided</scope>
     </dependency>
@@ -113,7 +112,7 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
     </dependency>
     <dependency>
       <groupId>org.slf4j</groupId>
-      <artifactId>slf4j-log4j12</artifactId>
+      <artifactId>slf4j-reload4j</artifactId>
       <version>2.0.2</version>
       <scope>test</scope>
     </dependency>
@@ -162,10 +161,11 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
           <plugin>
             <groupId>com.qulice</groupId>
             <artifactId>qulice-maven-plugin</artifactId>
-            <version>0.21.1</version>
+            <version>0.22.0</version>
             <configuration>
               <excludes combine.children="append">
                 <exclude>xml:/src/it/settings.xml</exclude>
+                <exclude>pmd:/src/it/.*</exclude>
                 <exclude>xml:/src/test/resources/com/jcabi/xml/.*</exclude>
                 <exclude>findbugs:.*</exclude>
               </excludes>
diff --git a/src/main/java/com/jcabi/xml/DomParser.java b/src/main/java/com/jcabi/xml/DomParser.java
index b1f339b..2a55cdc 100644
--- a/src/main/java/com/jcabi/xml/DomParser.java
+++ b/src/main/java/com/jcabi/xml/DomParser.java
@@ -113,6 +113,7 @@ public Document document() {
                 ex
             );
         }
+        final long start = System.nanoTime();
         final Document doc;
         try {
             doc = builder.parse(new ByteArrayInputStream(this.xml));
@@ -126,7 +127,13 @@ public Document document() {
             );
         }
         if (Logger.isDebugEnabled(this)) {
-            Logger.debug(this, "%s parsed XML", builder.getClass().getName());
+            Logger.debug(
+                this,
+                "%s parsed %d bytes of XML in %[nano]s",
+                builder.getClass().getName(),
+                this.xml.length,
+                System.nanoTime() - start
+            );
         }
         return doc;
     }
diff --git a/src/main/java/com/jcabi/xml/XMLDocument.java b/src/main/java/com/jcabi/xml/XMLDocument.java
index a3ef373..e5b14d1 100644
--- a/src/main/java/com/jcabi/xml/XMLDocument.java
+++ b/src/main/java/com/jcabi/xml/XMLDocument.java
@@ -337,7 +337,7 @@ public int hashCode() {
 
     @Override
     public Node node() {
-        final Node casted = Node.class.cast(this.cache);
+        final Node casted = this.cache;
         final Node answer;
         if (casted instanceof Document) {
             answer = casted.cloneNode(true);
@@ -362,7 +362,7 @@ public List<String> xpath(final String query) {
             final NodeList nodes = this.fetch(query, NodeList.class);
             items = new ArrayList<>(nodes.getLength());
             for (int idx = 0; idx < nodes.getLength(); ++idx) {
-                final int type = (int) nodes.item(idx).getNodeType();
+                final int type = nodes.item(idx).getNodeType();
                 if (type != (int) Node.TEXT_NODE
                     && type != (int) Node.ATTRIBUTE_NODE
                     && type != (int) Node.CDATA_SECTION_NODE) {
@@ -391,13 +391,13 @@ public List<String> xpath(final String query) {
                 );
             }
         }
-        return new ListWrapper<>(items, Node.class.cast(this.cache), query);
+        return new ListWrapper<>(items, this.cache, query);
     }
 
     @Override
     public XML registerNs(final String prefix, final Object uri) {
         return new XMLDocument(
-            Node.class.cast(this.cache),
+            this.cache,
             this.context.add(prefix, uri),
             this.leaf
         );
@@ -425,13 +425,13 @@ public List<XML> nodes(final String query) {
                 ), ex
             );
         }
-        return new ListWrapper<>(items, Node.class.cast(this.cache), query);
+        return new ListWrapper<>(items, this.cache, query);
     }
 
     @Override
     public XML merge(final NamespaceContext ctx) {
         return new XMLDocument(
-            Node.class.cast(this.cache),
+            this.cache,
             this.context.merge(ctx),
             this.leaf
         );
@@ -496,7 +496,7 @@ private <T> T fetch(final String query, final Class<T> type)
                 )
             );
         }
-        return (T) xpath.evaluate(query, Node.class.cast(this.cache), qname);
+        return (T) xpath.evaluate(query, this.cache, qname);
     }
 
     /**
diff --git a/src/main/java/com/jcabi/xml/XSDDocument.java b/src/main/java/com/jcabi/xml/XSDDocument.java
index 02ff3e9..b903338 100644
--- a/src/main/java/com/jcabi/xml/XSDDocument.java
+++ b/src/main/java/com/jcabi/xml/XSDDocument.java
@@ -184,14 +184,14 @@ public Collection<SAXParseException> validate(final Source xml) {
             }
         } catch (final SAXException ex) {
             throw new IllegalStateException(
-                String.format("failed to create XSD schema from %s", this.xsd),
+                String.format("Failed to create XSD schema from %s", this.xsd),
                 ex
             );
         }
         final Collection<SAXParseException> errors =
             new CopyOnWriteArrayList<>();
         final Validator validator = schema.newValidator();
-        validator.setErrorHandler(new ValidationHandler(errors));
+        validator.setErrorHandler(new XSDDocument.ValidationHandler(errors));
         try {
             synchronized (XSDDocument.class) {
                 validator.validate(xml);
diff --git a/src/main/java/com/jcabi/xml/XSLDocument.java b/src/main/java/com/jcabi/xml/XSLDocument.java
index f1dc84d..d7855be 100644
--- a/src/main/java/com/jcabi/xml/XSLDocument.java
+++ b/src/main/java/com/jcabi/xml/XSLDocument.java
@@ -83,7 +83,7 @@ public final class XSLDocument implements XSL {
      *
      * <p>This will NOT remove
      * existing indentation between Element nodes currently introduced by the
-     * constructor of {@link com.jcabi.xml.XMLDocument}. For example:
+     * constructor of {@link XMLDocument}. For example:
      *
      * <pre>
      * {@code
@@ -403,6 +403,7 @@ private void transformInto(final XML xml, final Result result) {
         final Transformer trans = this.transformer();
         final ConsoleErrorListener errors = new ConsoleErrorListener();
         trans.setErrorListener(errors);
+        final long start = System.nanoTime();
         try {
             trans.transform(new DOMSource(xml.node()), result);
         } catch (final TransformerException ex) {
@@ -416,7 +417,12 @@ private void transformInto(final XML xml, final Result result) {
             );
         }
         if (Logger.isDebugEnabled(this)) {
-            Logger.debug(this, "%s transformed XML", trans.getClass().getName());
+            Logger.debug(
+                this,
+                "%s transformed XML in %[nano]s",
+                trans.getClass().getName(),
+                System.nanoTime() - start
+            );
         }
     }
 
@@ -464,12 +470,12 @@ private static Transformer forSaxon(final Transformer trans) {
             return trans;
         }
         if (Version.getStructuredVersionNumber()[0] < 11) {
-            TransformerImpl.class.cast(trans)
+            ((TransformerImpl) trans)
                 .getUnderlyingController()
                 .setMessageEmitter(new MessageWarner());
         }
         if (Version.getStructuredVersionNumber()[0] >= 11) {
-            TransformerImpl.class.cast(trans)
+            ((TransformerImpl) trans)
                 .getUnderlyingController()
                 .setMessageHandler(
                     message -> Logger.error(
diff --git a/src/test/java/com/jcabi/xml/ClasspathInputTest.java b/src/test/java/com/jcabi/xml/ClasspathInputTest.java
index 7d91207..4c520d0 100644
--- a/src/test/java/com/jcabi/xml/ClasspathInputTest.java
+++ b/src/test/java/com/jcabi/xml/ClasspathInputTest.java
@@ -35,12 +35,12 @@
 import org.w3c.dom.ls.LSInput;
 
 /**
- * Test case for {@link com.jcabi.xml.ClasspathInput}.
+ * Test case for {@link ClasspathInput}.
  * @since 0.17.3
  */
-public final class ClasspathInputTest {
+final class ClasspathInputTest {
     @Test
-    public void readsStringFromResourceSuccessfully() {
+    void readsStringFromResourceSuccessfully() {
         final LSInput input = new ClasspathInput(
             "Id", "com/jcabi/xml/simple.xml"
         );
diff --git a/src/test/java/com/jcabi/xml/ClasspathSourcesTest.java b/src/test/java/com/jcabi/xml/ClasspathSourcesTest.java
index cb28f1c..84f40bd 100644
--- a/src/test/java/com/jcabi/xml/ClasspathSourcesTest.java
+++ b/src/test/java/com/jcabi/xml/ClasspathSourcesTest.java
@@ -37,10 +37,10 @@
  * Test of ClasspathSources.
  * @since 0.18
  */
-public final class ClasspathSourcesTest {
+final class ClasspathSourcesTest {
 
     @Test
-    public void sourcesResolvedFromBase() throws Exception {
+    void sourcesResolvedFromBase() throws Exception {
         MatcherAssert.assertThat(
             new ClasspathSources().resolve("simple.xml", "com.jcabi.xml."),
             Matchers.notNullValue()
diff --git a/src/test/java/com/jcabi/xml/DomParserTest.java b/src/test/java/com/jcabi/xml/DomParserTest.java
index e5f4f7e..23cb21a 100644
--- a/src/test/java/com/jcabi/xml/DomParserTest.java
+++ b/src/test/java/com/jcabi/xml/DomParserTest.java
@@ -38,10 +38,10 @@
  * Test case for {@link DomParser}.
  * @since 0.1
  */
-public final class DomParserTest {
+final class DomParserTest {
 
     @Test
-    public void parsesIncomingXmlDocument() {
+    void parsesIncomingXmlDocument() {
         final String xml = "<a><b>\u0443\u0440\u0430!</b></a>";
         final DomParser parser = new DomParser(
             DocumentBuilderFactory.newInstance(), xml
@@ -53,7 +53,7 @@ public void parsesIncomingXmlDocument() {
     }
 
     @Test
-    public void parsesIncomingXmlDocumentComment() {
+    void parsesIncomingXmlDocumentComment() {
         final String xml = "<?xml version='1.0'?><!-- test --><root/>";
         final DomParser parser = new DomParser(
             DocumentBuilderFactory.newInstance(), xml
@@ -66,8 +66,8 @@ public void parsesIncomingXmlDocumentComment() {
 
     @Test
     @SuppressWarnings("PMD.AvoidInstantiatingObjectsInLoops")
-    public void allowsValidXmlFormatting() {
-        final String[] texts = new String[] {
+    void allowsValidXmlFormatting() {
+        final String[] texts = {
             "<?xml version=\"1.0\" encoding='ISO-8895-1'?><a/>",
             "<:a/>",
             "<ns:a><ns2:test-me/></ns:a>",
diff --git a/src/test/java/com/jcabi/xml/FileSourcesTest.java b/src/test/java/com/jcabi/xml/FileSourcesTest.java
index 56b9c38..243d9e7 100644
--- a/src/test/java/com/jcabi/xml/FileSourcesTest.java
+++ b/src/test/java/com/jcabi/xml/FileSourcesTest.java
@@ -41,10 +41,10 @@
  * Test of FileSources.
  * @since 0.18
  */
-public final class FileSourcesTest {
+final class FileSourcesTest {
 
     @Test
-    public void sourcesResolvedFromDir() throws Exception {
+    void sourcesResolvedFromDir() throws Exception {
         final File file = Files.createTempDirectory("")
             .resolve("dummy.xml").toFile();
         new LengthOf(new TeeInput("test", file)).value();
diff --git a/src/test/java/com/jcabi/xml/StrictXMLTest.java b/src/test/java/com/jcabi/xml/StrictXMLTest.java
index 4ae49ec..d59c11f 100755
--- a/src/test/java/com/jcabi/xml/StrictXMLTest.java
+++ b/src/test/java/com/jcabi/xml/StrictXMLTest.java
@@ -50,6 +50,7 @@
 import org.junit.jupiter.api.Assumptions;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+import org.mockito.ArgumentMatchers;
 import org.mockito.Mockito;
 import org.mockito.stubbing.Answer;
 
@@ -61,17 +62,17 @@
  * @checkstyle AbbreviationAsWordInNameCheck (5 lines)
  */
 @SuppressWarnings({ "PMD.TooManyMethods", "PMD.AvoidDuplicateLiterals"})
-public final class StrictXMLTest {
+final class StrictXMLTest {
 
     @BeforeEach
-    public void weAreOnline() throws IOException {
+    void weAreOnline() throws IOException {
         Assumptions.assumeTrue(
             InetAddress.getByName("w3.org").isReachable(1000)
         );
     }
 
     @Test
-    public void passesValidXmlThrough() {
+    void passesValidXmlThrough() {
         new StrictXML(
             new XMLDocument("<root>passesValidXmlThrough</root>"),
             new XSDDocument(
@@ -85,7 +86,7 @@ public void passesValidXmlThrough() {
     }
 
     @Test
-    public void rejectsInvalidXmlThrough() {
+    void rejectsInvalidXmlThrough() {
         Assertions.assertThrows(
             IllegalArgumentException.class,
             () -> new StrictXML(
@@ -101,7 +102,7 @@ public void rejectsInvalidXmlThrough() {
     }
 
     @Test
-    public void passesValidXmlUsingXsiSchemaLocation() throws Exception {
+    void passesValidXmlUsingXsiSchemaLocation() throws Exception {
         new StrictXML(
             new XMLDocument(
                 this.getClass().getResource("xsi-schemalocation-valid.xml")
@@ -110,7 +111,7 @@ public void passesValidXmlUsingXsiSchemaLocation() throws Exception {
     }
 
     @Test
-    public void rejectsInvalidXmlUsingXsiSchemaLocation() {
+    void rejectsInvalidXmlUsingXsiSchemaLocation() {
         Assertions.assertThrows(
             IllegalStateException.class,
             () -> new StrictXML(
@@ -122,7 +123,7 @@ public void rejectsInvalidXmlUsingXsiSchemaLocation() {
     }
 
     @Test
-    public void validatesMultipleXmlsInThreads() throws Exception {
+    void validatesMultipleXmlsInThreads() throws Exception {
         final int timeout = 10;
         final int numrun = 100;
         final int loop = 50;
@@ -176,7 +177,7 @@ public void validatesMultipleXmlsInThreads() throws Exception {
     }
 
     @Test
-    public void passesValidXmlWithNetworkProblems() throws Exception {
+    void passesValidXmlWithNetworkProblems() throws Exception {
         final Validator validator = Mockito.mock(Validator.class);
         final AtomicInteger counter = new AtomicInteger(0);
         // @checkstyle IllegalThrowsCheck (5 lines)
@@ -190,7 +191,7 @@ public void passesValidXmlWithNetworkProblems() throws Exception {
                 }
                 return null;
             }
-        ).when(validator).validate(Mockito.any(Source.class));
+        ).when(validator).validate(ArgumentMatchers.any(Source.class));
         new StrictXML(
             new XMLDocument(
                 "<root>passesValidXmlWithNetworkProblems</root>"
@@ -200,7 +201,7 @@ public void passesValidXmlWithNetworkProblems() throws Exception {
     }
 
     @Test
-    public void lookupXsdsFromClasspath() {
+    void lookupXsdsFromClasspath() {
         new StrictXML(
             new XMLDocument(
                 StringUtils.join(
@@ -224,7 +225,7 @@ public void lookupXsdsFromClasspath() {
     }
 
     @Test
-    public void rejectXmlWhenXsdIsNotAvailableOnClasspath() {
+    void rejectXmlWhenXsdIsNotAvailableOnClasspath() {
         Assertions.assertThrows(
             IllegalArgumentException.class,
             () -> new StrictXML(
@@ -251,7 +252,7 @@ public void rejectXmlWhenXsdIsNotAvailableOnClasspath() {
     }
 
     @Test
-    public void handlesXmlWithoutSchemaLocation() {
+    void handlesXmlWithoutSchemaLocation() {
         Assertions.assertThrows(
             IllegalArgumentException.class,
             () -> new StrictXML(
diff --git a/src/test/java/com/jcabi/xml/TextResourceTest.java b/src/test/java/com/jcabi/xml/TextResourceTest.java
index d986f52..5359229 100644
--- a/src/test/java/com/jcabi/xml/TextResourceTest.java
+++ b/src/test/java/com/jcabi/xml/TextResourceTest.java
@@ -45,10 +45,10 @@
  *
  * @since 0.1
  */
-public final class TextResourceTest {
+final class TextResourceTest {
 
     @Test
-    public void readsStreamAsText() {
+    void readsStreamAsText() {
         final String text = "Blah!\u20ac\u2122";
         final InputStream stream = new ByteArrayInputStream(
             text.getBytes(StandardCharsets.UTF_8)
@@ -60,7 +60,7 @@ public void readsStreamAsText() {
     }
 
     @Test
-    public void readsFileAsText() throws Exception {
+    void readsFileAsText() throws Exception {
         final String text = "<a xmlns='urn:foo'><b>\u0433!</b></a>";
         final File file = Files.createTempDirectory("")
             .resolve("dummy.xml").toFile();
diff --git a/src/test/java/com/jcabi/xml/XMLDocumentTest.java b/src/test/java/com/jcabi/xml/XMLDocumentTest.java
index a76502f..d2f916f 100644
--- a/src/test/java/com/jcabi/xml/XMLDocumentTest.java
+++ b/src/test/java/com/jcabi/xml/XMLDocumentTest.java
@@ -56,10 +56,10 @@
  * @checkstyle AbbreviationAsWordInNameCheck (5 lines)
  */
 @SuppressWarnings({ "PMD.TooManyMethods", "PMD.DoNotUseThreads" })
-public final class XMLDocumentTest {
+final class XMLDocumentTest {
 
     @Test
-    public void findsDocumentNodesWithXpath() {
+    void findsDocumentNodesWithXpath() {
         final XML doc = new XMLDocument(
             "<r><a>\u0443\u0440\u0430!</a><a>B</a></r>"
         );
@@ -74,7 +74,7 @@ public void findsDocumentNodesWithXpath() {
     }
 
     @Test
-    public void findWithXpathListEqualsToJavaUtilList() {
+    void findWithXpathListEqualsToJavaUtilList() {
         MatcherAssert.assertThat(
             new XMLDocument(
                 "<does><not><matter/></not></does>"
@@ -102,7 +102,7 @@ public void findWithXpathListEqualsToJavaUtilList() {
     }
 
     @Test
-    public void findsWithXpathAndNamespaces() {
+    void findsWithXpathAndNamespaces() {
         final XML doc = new XMLDocument(
             "<html xmlns='http://www.w3.org/1999/xhtml'><div>\u0443\u0440\u0430!</div></html>"
         );
@@ -117,7 +117,7 @@ public void findsWithXpathAndNamespaces() {
     }
 
     @Test
-    public void findsWithXpathWithCustomNamespace() throws Exception {
+    void findsWithXpathWithCustomNamespace() throws Exception {
         final File file = Files.createTempDirectory("")
             .resolve("x.xml").toFile();
         new LengthOf(
@@ -138,7 +138,7 @@ public void findsWithXpathWithCustomNamespace() throws Exception {
     }
 
     @Test
-    public void findsDocumentNodesWithXpathAndReturnsThem() throws Exception {
+    void findsDocumentNodesWithXpathAndReturnsThem() throws Exception {
         final XML doc = new XMLDocument(
             new ByteArrayInputStream(
                 "<root><a><x>1</x></a><a><x>2</x></a></root>".getBytes()
@@ -155,7 +155,7 @@ public void findsDocumentNodesWithXpathAndReturnsThem() throws Exception {
     }
 
     @Test
-    public void convertsItselfToXml() {
+    void convertsItselfToXml() {
         final XML doc = new XMLDocument("<hello><a/></hello>");
         MatcherAssert.assertThat(
             doc.toString(),
@@ -164,7 +164,7 @@ public void convertsItselfToXml() {
     }
 
     @Test
-    public void retrievesDomNode() throws Exception {
+    void retrievesDomNode() throws Exception {
         final XML doc = new XMLDocument(
             this.getClass().getResource("simple.xml")
         );
@@ -179,7 +179,7 @@ public void retrievesDomNode() throws Exception {
     }
 
     @Test
-    public void throwsCustomExceptionWhenXpathNotFound() {
+    void throwsCustomExceptionWhenXpathNotFound() {
         try {
             new XMLDocument("<root/>").xpath("/absent-node/text()").get(0);
             MatcherAssert.assertThat("exception expected here", false);
@@ -195,7 +195,7 @@ public void throwsCustomExceptionWhenXpathNotFound() {
     }
 
     @Test
-    public void throwsWhenXpathQueryIsBroken() {
+    void throwsWhenXpathQueryIsBroken() {
         try {
             new XMLDocument("<root-99/>").xpath("/*/hello()");
             MatcherAssert.assertThat("exception expected", false);
@@ -208,7 +208,7 @@ public void throwsWhenXpathQueryIsBroken() {
     }
 
     @Test
-    public void preservesProcessingInstructions() {
+    void preservesProcessingInstructions() {
         MatcherAssert.assertThat(
             new XMLDocument("<?xml version='1.0'?><?x test?><a/>"),
             Matchers.hasToString(Matchers.containsString("<?x test?>"))
@@ -216,7 +216,7 @@ public void preservesProcessingInstructions() {
     }
 
     @Test
-    public void preservesDomStructureWhenXpath() {
+    void preservesDomStructureWhenXpath() {
         final XML doc = new XMLDocument(
             "<root><item1/><item2/><item3/></root>"
         );
@@ -228,7 +228,7 @@ public void preservesDomStructureWhenXpath() {
     }
 
     @Test
-    public void printsWithAndWithoutXmlHeader() {
+    void printsWithAndWithoutXmlHeader() {
         final XML doc = new XMLDocument("<hey/>");
         MatcherAssert.assertThat(
             doc,
@@ -241,7 +241,7 @@ public void printsWithAndWithoutXmlHeader() {
     }
 
     @Test
-    public void parsesInMultipleThreads() throws Exception {
+    void parsesInMultipleThreads() throws Exception {
         final int timeout = 10;
         final int loop = 100;
         final Runnable runnable = () -> MatcherAssert.assertThat(
@@ -249,7 +249,7 @@ public void parsesInMultipleThreads() throws Exception {
             XhtmlMatchers.hasXPath("/root/hey")
         );
         final ExecutorService service = Executors.newFixedThreadPool(5);
-        for (int count = 0; count < loop; count = count + 1) {
+        for (int count = 0; count < loop; count += 1) {
             service.submit(runnable);
         }
         service.shutdown();
@@ -261,7 +261,7 @@ public void parsesInMultipleThreads() throws Exception {
     }
 
     @Test
-    public void xpathInMultipleThreads() throws Exception {
+    void xpathInMultipleThreads() throws Exception {
         final int timeout = 30;
         final int repeat = 1000;
         final int loop = 50;
@@ -297,7 +297,7 @@ public void xpathInMultipleThreads() throws Exception {
     }
 
     @Test
-    public void printsInMultipleThreads() throws Exception {
+    void printsInMultipleThreads() throws Exception {
         final int timeout = 30;
         final int repeat = 1000;
         final int loop = 50;
@@ -327,7 +327,7 @@ public void printsInMultipleThreads() throws Exception {
     }
 
     @Test
-    public void performsXpathCalculations() {
+    void performsXpathCalculations() {
         final XML xml = new XMLDocument("<x><a/><a/><a/></x>");
         MatcherAssert.assertThat(
             xml.xpath("count(//x/a)"),
@@ -340,7 +340,7 @@ public void performsXpathCalculations() {
     }
 
     @Test
-    public void buildsDomNode() {
+    void buildsDomNode() {
         final XML doc = new XMLDocument("<?xml version='1.0'?><f/>");
         MatcherAssert.assertThat(
             doc.node(),
@@ -353,7 +353,7 @@ public void buildsDomNode() {
     }
 
     @Test
-    public void comparesToAnotherDocument() {
+    void comparesToAnotherDocument() {
         MatcherAssert.assertThat(
             new XMLDocument("<hi>\n<dude>  </dude></hi>"),
             Matchers.equalTo(new XMLDocument("<hi><dude>  </dude></hi>"))
@@ -367,7 +367,7 @@ public void comparesToAnotherDocument() {
     }
 
     @Test
-    public void preservesXmlNamespaces() {
+    void preservesXmlNamespaces() {
         final String xml = "<a xmlns='http://www.w3.org/1999/xhtml'><b/></a>";
         MatcherAssert.assertThat(
             new XMLDocument(xml),
@@ -376,7 +376,7 @@ public void preservesXmlNamespaces() {
     }
 
     @Test
-    public void preservesImmutability() {
+    void preservesImmutability() {
         final XML xml = new XMLDocument("<r1><a/></r1>");
         final Node node = xml.nodes("/r1/a").get(0).node();
         node.appendChild(node.getOwnerDocument().createElement("h9"));
@@ -387,7 +387,7 @@ public void preservesImmutability() {
     }
 
     @Test
-    public void appliesXpathToClonedNode() {
+    void appliesXpathToClonedNode() {
         final XML xml = new XMLDocument("<t6><z9 a='433'/></t6>");
         final XML root = xml.nodes("/t6").get(0);
         MatcherAssert.assertThat(
diff --git a/src/test/java/com/jcabi/xml/XPathContextTest.java b/src/test/java/com/jcabi/xml/XPathContextTest.java
index 059d901..88861e2 100644
--- a/src/test/java/com/jcabi/xml/XPathContextTest.java
+++ b/src/test/java/com/jcabi/xml/XPathContextTest.java
@@ -42,10 +42,10 @@
  * Test case for {@link XPathContext}.
  * @since 0.1
  */
-public final class XPathContextTest {
+final class XPathContextTest {
 
     @Test
-    public void findsNamespaceByPrefix() {
+    void findsNamespaceByPrefix() {
         final String prefix = "ns1-foo";
         final String namespace = "hey-it-is-a-namespace";
         final NamespaceContext ctx = new XPathContext()
@@ -58,7 +58,7 @@ public void findsNamespaceByPrefix() {
     }
 
     @Test
-    public void findsPrefixByNamespace() {
+    void findsPrefixByNamespace() {
         final String prefix = "ns2-foo";
         final String namespace = "hey-it-is-a-new-namespace";
         final NamespaceContext ctx = new XPathContext()
@@ -71,13 +71,13 @@ public void findsPrefixByNamespace() {
     }
 
     @Test
-    public void findsPrefixesByNamespace() {
+    void findsPrefixesByNamespace() {
         final String namespace = "simple-short-namespace";
         final NamespaceContext ctx = new XPathContext(namespace, namespace);
         final List<String> prefixes = new ArrayList<>(0);
         final Iterator<?> iter = ctx.getPrefixes(namespace);
         while (iter.hasNext()) {
-            prefixes.add(String.class.cast(iter.next()));
+            prefixes.add((String) iter.next());
         }
         MatcherAssert.assertThat(
             prefixes,
@@ -90,7 +90,7 @@ public void findsPrefixesByNamespace() {
     }
 
     @Test
-    public void findsDefaultNamespaces() {
+    void findsDefaultNamespaces() {
         final NamespaceContext ctx = new XPathContext();
         MatcherAssert.assertThat(
             ctx.getNamespaceURI("xhtml"),
@@ -119,7 +119,7 @@ public void findsDefaultNamespaces() {
     }
 
     @Test
-    public void findsNonBoundNamespaces() {
+    void findsNonBoundNamespaces() {
         final NamespaceContext ctx = new XPathContext();
         MatcherAssert.assertThat(
             ctx.getNamespaceURI("some-other-unbound-prefix"),
diff --git a/src/test/java/com/jcabi/xml/XSDDocumentTest.java b/src/test/java/com/jcabi/xml/XSDDocumentTest.java
index 9a3ea2e..680ca78 100644
--- a/src/test/java/com/jcabi/xml/XSDDocumentTest.java
+++ b/src/test/java/com/jcabi/xml/XSDDocumentTest.java
@@ -52,10 +52,10 @@
  * @since 0.1
  * @checkstyle AbbreviationAsWordInNameCheck (5 lines)
  */
-public final class XSDDocumentTest {
+final class XSDDocumentTest {
 
     @Test
-    public void validatesXml() {
+    void validatesXml() {
         final XSD xsd = new XSDDocument(
             new ByteArrayInputStream(
                 StringUtils.join(
@@ -78,7 +78,7 @@ public void validatesXml() {
     }
 
     @Test
-    public void detectsSchemaViolations() {
+    void detectsSchemaViolations() {
         final String xsd = StringUtils.join(
             "<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema'>",
             "<xs:element name='first'/></xs:schema>"
@@ -99,16 +99,12 @@ public void detectsSchemaViolations() {
         );
     }
 
-    /**
-     * XSDDocument can validate complex XML.
-     * @throws Exception If something goes wrong inside
-     */
     @Test
     @SuppressWarnings({
         "PMD.AvoidInstantiatingObjectsInLoops",
         "PMD.InsufficientStringBufferDeclaration"
         })
-    public void validatesComplexXml() throws Exception {
+    void validatesComplexXml() throws Exception {
         final int loopp = 5;
         final int size = 10_000;
         final int loop = 100;
@@ -143,12 +139,8 @@ public void validatesComplexXml() throws Exception {
         }
     }
 
-    /**
-     * XSDDocument can validate a long XML.
-     * @throws Exception If something goes wrong inside
-     */
     @Test
-    public void validatesLongXml() throws Exception {
+    void validatesLongXml() throws Exception {
         final XSD xsd = new XSDDocument(
             this.getClass().getResource("sample.xsd")
         );
@@ -171,12 +163,8 @@ public void validatesLongXml() throws Exception {
         );
     }
 
-    /**
-     * XSDDocument can validate XML in multiple threads.
-     * @throws Exception If something goes wrong inside
-     */
     @Test
-    public void validatesMultipleXmlsInThreads() throws Exception {
+    void validatesMultipleXmlsInThreads() throws Exception {
         final int random = 100;
         final int loop = 10;
         final int timeout = 30;
@@ -220,7 +208,7 @@ public Void call() throws Exception {
         }
         service.shutdown();
         MatcherAssert.assertThat(
-            service.awaitTermination((long) timeout, TimeUnit.SECONDS),
+            service.awaitTermination(timeout, TimeUnit.SECONDS),
             Matchers.is(true)
         );
         service.shutdownNow();
diff --git a/src/test/java/com/jcabi/xml/XSLChainTest.java b/src/test/java/com/jcabi/xml/XSLChainTest.java
index d697660..02cd48f 100644
--- a/src/test/java/com/jcabi/xml/XSLChainTest.java
+++ b/src/test/java/com/jcabi/xml/XSLChainTest.java
@@ -40,10 +40,10 @@
  * @since 0.12
  * @checkstyle AbbreviationAsWordInNameCheck (5 lines)
  */
-public final class XSLChainTest {
+final class XSLChainTest {
 
     @Test
-    public void makesXslTransformations() {
+    void makesXslTransformations() {
         final XSL first = new XSLDocument(
             StringUtils.join(
                 "<xsl:stylesheet",
diff --git a/src/test/java/com/jcabi/xml/XSLDocumentTest.java b/src/test/java/com/jcabi/xml/XSLDocumentTest.java
index 32c089f..7075b75 100644
--- a/src/test/java/com/jcabi/xml/XSLDocumentTest.java
+++ b/src/test/java/com/jcabi/xml/XSLDocumentTest.java
@@ -45,10 +45,10 @@
  * @checkstyle AbbreviationAsWordInNameCheck (5 lines)
  */
 @SuppressWarnings("PMD.AvoidDuplicateLiterals")
-public final class XSLDocumentTest {
+final class XSLDocumentTest {
 
     @Test
-    public void makesXslTransformations() {
+    void makesXslTransformations() {
         final XSL xsl = new XSLDocument(
             StringUtils.join(
                 "<xsl:stylesheet",
@@ -70,7 +70,7 @@ public void makesXslTransformations() {
 
     @Test
     @SuppressWarnings("PMD.DoNotUseThreads")
-    public void makesXslTransformationsInThreads() throws Exception {
+    void makesXslTransformationsInThreads() throws Exception {
         final int loop = 50;
         final int timeout = 30;
         final XSL xsl = new XSLDocument(
@@ -99,7 +99,7 @@ public void makesXslTransformationsInThreads() throws Exception {
     }
 
     @Test
-    public void transformsWithImports() {
+    void transformsWithImports() {
         final XSL xsl = new XSLDocument(
             this.getClass().getResourceAsStream("first.xsl")
         ).with(new ClasspathSources(this.getClass()));
@@ -110,7 +110,7 @@ public void transformsWithImports() {
     }
 
     @Test
-    public void transformsWithImportsFromUrl() {
+    void transformsWithImportsFromUrl() {
         final XSL xsl = XSLDocument.make(
             this.getClass().getResource("first.xsl")
         ).with(new ClasspathSources(this.getClass()));
@@ -121,7 +121,7 @@ public void transformsWithImportsFromUrl() {
     }
 
     @Test
-    public void transformsIntoText() {
+    void transformsIntoText() {
         final XSL xsl = new XSLDocument(
             StringUtils.join(
                 "<xsl:stylesheet ",
@@ -137,7 +137,7 @@ public void transformsIntoText() {
     }
 
     @Test
-    public void stripsXml() {
+    void stripsXml() {
         MatcherAssert.assertThat(
             XSLDocument.STRIP.transform(
                 new XMLDocument("<a>   <b/>  </a>")
@@ -147,7 +147,7 @@ public void stripsXml() {
     }
 
     @Test
-    public void transformsIntoTextWithParams() {
+    void transformsIntoTextWithParams() {
         final XSL xsl = new XSLDocument(
             StringUtils.join(
                 "<xsl:stylesheet   ",
@@ -166,7 +166,7 @@ public void transformsIntoTextWithParams() {
     }
 
     @Test
-    public void transformsIntoTextWithIntegerParams() {
+    void transformsIntoTextWithIntegerParams() {
         final XSL xsl = new XSLDocument(
             StringUtils.join(
                 "<xsl:stylesheet     ",
@@ -184,7 +184,7 @@ public void transformsIntoTextWithIntegerParams() {
     }
 
     @Test
-    public void catchesXslErrorMessages() {
+    void catchesXslErrorMessages() {
         MatcherAssert.assertThat(
             Assertions.assertThrows(
                 RuntimeException.class,
@@ -204,7 +204,7 @@ public void catchesXslErrorMessages() {
     }
 
     @Test
-    public void catchesSaxonWarnings() {
+    void catchesSaxonWarnings() {
         new XSLDocument(
             StringUtils.join(
                 " <xsl:stylesheet",