JAVA-18132 Upgrade custom-pmd module to JDK 11 (#13500)

Co-authored-by: timis1 <noreplay@yahoo.com>

custom-pmd/pom.xml

@@ -44,10 +44,10 @@
     </build>
 
     <properties>
-        <maven-compiler-plugin.version>3.7.0</maven-compiler-plugin.version>
-        <pmdVersion>6.0.1</pmdVersion>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
+        <maven-compiler-plugin.version>3.10.0</maven-compiler-plugin.version>
+        <pmdVersion>6.53.0</pmdVersion>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
     </properties>
 
 </project>

custom-pmd/src/main/java/com/baeldung/pmd/UnitTestNamingConventionRule.java

@@ -18,8 +18,9 @@ public class UnitTestNamingConventionRule extends AbstractJavaRule {
       "UnitTest",
       "jmhTest");
 
+    @Override
     public Object visit(ASTClassOrInterfaceDeclaration node, Object data) {
-        String className = node.getImage();
+        String className = node.getSimpleName();
         Objects.requireNonNull(className);
 
         if (className.endsWith("SpringContextTest")) {