diff --git a/.idea/compiler.xml b/.idea/compiler.xml
index aeed8b2aec..d74358ecad 100644
--- a/.idea/compiler.xml
+++ b/.idea/compiler.xml
@@ -9,6 +9,7 @@
         <module name="codebank" />
         <module name="java-numbers-2" />
         <module name="java-numbers" />
+        <module name="xml" />
         <module name="discourse" />
       </profile>
     </annotationProcessing>
diff --git a/.idea/encodings.xml b/.idea/encodings.xml
index 3ec6972f06..cb62bbdce8 100644
--- a/.idea/encodings.xml
+++ b/.idea/encodings.xml
@@ -8,5 +8,7 @@
     <file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
     <file url="file://$PROJECT_DIR$/toolkits/codebank/src/main/java" charset="UTF-8" />
     <file url="file://$PROJECT_DIR$/toolkits/discourse/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/xml/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/xml/src/main/resources" charset="UTF-8" />
   </component>
 </project>
\ No newline at end of file
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 8c6fa47048..db664eadf0 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -4,11 +4,14 @@
     <option name="autoReloadType" value="SELECTIVE" />
   </component>
   <component name="ChangeListManager">
-    <list default="true" id="2a855b03-5ee0-4324-b916-110994784a14" name="Changes" comment="Init commit all code">
+    <list default="true" id="2a855b03-5ee0-4324-b916-110994784a14" name="Changes" comment="Check Prime numbers">
+      <change beforePath="$PROJECT_DIR$/.idea/compiler.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/compiler.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/encodings.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/encodings.xml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/parent-java/java-numbers-2/README.md" beforeDir="false" afterPath="$PROJECT_DIR$/parent-java/java-numbers-2/README.md" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/parent-java/java-numbers-2/src/test/java/com/ossez/prime/PrimeGeneratorUnitTest.java" beforeDir="false" afterPath="$PROJECT_DIR$/parent-java/java-numbers-2/src/test/java/com/ossez/prime/PrimeGeneratorUnitTest.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/toolkits/codebank/src/test/java/com/ossez/toolkits/codebank/tests/algorithm/PrimeNumbersTest.java" beforeDir="false" afterPath="$PROJECT_DIR$/toolkits/codebank/src/test/java/com/ossez/toolkits/codebank/tests/algorithm/PrimeNumbersTest.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/core-java-modules/core-java-io/pom.xml" beforeDir="false" afterPath="$PROJECT_DIR$/core-java-modules/core-java-io/pom.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/parent-java/java-numbers-2/src/test/java/com/ossez/lossyconversion/ConversionTechniquesUnitTest.java" beforeDir="false" afterPath="$PROJECT_DIR$/parent-java/java-numbers-2/src/test/java/com/ossez/lossyconversion/ConversionTechniquesUnitTest.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/pom.xml" beforeDir="false" afterPath="$PROJECT_DIR$/pom.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/toolkits/codebank/src/test/java/com/ossez/toolkits/codebank/tests/BlackboardTest.java" beforeDir="false" afterPath="$PROJECT_DIR$/toolkits/codebank/src/test/java/com/ossez/toolkits/codebank/tests/BlackboardTest.java" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -18,6 +21,14 @@
   <component name="Git.Settings">
     <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
   </component>
+  <component name="GitSEFilterConfiguration">
+    <file-type-list>
+      <filtered-out-file-type name="LOCAL_BRANCH" />
+      <filtered-out-file-type name="REMOTE_BRANCH" />
+      <filtered-out-file-type name="TAG" />
+      <filtered-out-file-type name="COMMIT_BY_MESSAGE" />
+    </file-type-list>
+  </component>
   <component name="ProjectId" id="1yXq0B5lme8eyBDkbRBUHlwFMj2" />
   <component name="ProjectViewState">
     <option name="hideEmptyMiddlePackages" value="true" />
@@ -28,36 +39,98 @@
     <property name="RunOnceActivity.ShowReadmeOnStart" value="true" />
     <property name="TF_FMT" value="false" />
     <property name="WebServerToolWindowFactoryState" value="false" />
+    <property name="last_opened_file_path" value="$PROJECT_DIR$/xml/src/test/resources" />
     <property name="node.js.detected.package.eslint" value="true" />
     <property name="node.js.detected.package.tslint" value="true" />
     <property name="node.js.selected.package.eslint" value="(autodetect)" />
     <property name="node.js.selected.package.tslint" value="(autodetect)" />
+    <property name="project.structure.last.edited" value="Project" />
+    <property name="project.structure.proportion" value="0.0" />
+    <property name="project.structure.side.proportion" value="0.24043715" />
+    <property name="settings.editor.selected.configurable" value="preferences.lookFeel" />
   </component>
-  <component name="RunManager" selected="JUnit.PrimeNumbersTest.testIsPrime">
-    <configuration name="NaNExample" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
-      <option name="MAIN_CLASS_NAME" value="com.ossez.nan.NaNExample" />
-      <module name="java-numbers-2" />
+  <component name="RecentsManager">
+    <key name="CopyFile.RECENT_KEYS">
+      <recent name="D:\WorkDir\Repository\GitHub\cwiki-us-docs\java-tutorials\xml\src\test\resources" />
+      <recent name="D:\WorkDir\Repository\GitHub\cwiki-us-docs\java-tutorials" />
+    </key>
+  </component>
+  <component name="RunManager" selected="JUnit.Dom4JParserUnitTest.testCreateXMLFromSystemProperties">
+    <configuration name="DefaultParserUnitTest.getFirstLevelNodeListTest" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
+      <module name="xml" />
       <extension name="coverage">
         <pattern>
-          <option name="PATTERN" value="com.ossez.nan.*" />
+          <option name="PATTERN" value="com.baeldung.xml.*" />
           <option name="ENABLED" value="true" />
         </pattern>
       </extension>
+      <option name="PACKAGE_NAME" value="com.baeldung.xml" />
+      <option name="MAIN_CLASS_NAME" value="com.baeldung.xml.DefaultParserUnitTest" />
+      <option name="METHOD_NAME" value="getFirstLevelNodeListTest" />
+      <option name="TEST_OBJECT" value="method" />
       <method v="2">
         <option name="Make" enabled="true" />
       </method>
     </configuration>
-    <configuration name="PrimeCheckerUnitTest.whenCheckIsPrime_thenTrue" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
-      <module name="java-numbers-2" />
+    <configuration name="DefaultParserUnitTest.getNodeListByTitleTest" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
+      <module name="xml" />
       <extension name="coverage">
         <pattern>
-          <option name="PATTERN" value="com.ossez.algorithms.primechecker.*" />
+          <option name="PATTERN" value="com.baeldung.xml.*" />
           <option name="ENABLED" value="true" />
         </pattern>
       </extension>
-      <option name="PACKAGE_NAME" value="com.ossez.algorithms.primechecker" />
-      <option name="MAIN_CLASS_NAME" value="com.ossez.algorithms.primechecker.PrimeCheckerUnitTest" />
-      <option name="METHOD_NAME" value="whenCheckIsPrime_thenTrue" />
+      <option name="PACKAGE_NAME" value="com.baeldung.xml" />
+      <option name="MAIN_CLASS_NAME" value="com.baeldung.xml.DefaultParserUnitTest" />
+      <option name="METHOD_NAME" value="getNodeListByTitleTest" />
+      <option name="TEST_OBJECT" value="method" />
+      <method v="2">
+        <option name="Make" enabled="true" />
+      </method>
+    </configuration>
+    <configuration name="Dom4JParserUnitTest.generateNewDocumentTest" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
+      <module name="xml" />
+      <extension name="coverage">
+        <pattern>
+          <option name="PATTERN" value="com.ossez.xml.*" />
+          <option name="ENABLED" value="true" />
+        </pattern>
+      </extension>
+      <option name="PACKAGE_NAME" value="com.ossez.xml" />
+      <option name="MAIN_CLASS_NAME" value="com.ossez.xml.Dom4JParserUnitTest" />
+      <option name="METHOD_NAME" value="generateNewDocumentTest" />
+      <option name="TEST_OBJECT" value="method" />
+      <method v="2">
+        <option name="Make" enabled="true" />
+      </method>
+    </configuration>
+    <configuration name="Dom4JParserUnitTest.testCreateXML" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
+      <module name="xml" />
+      <extension name="coverage">
+        <pattern>
+          <option name="PATTERN" value="com.ossez.xml.*" />
+          <option name="ENABLED" value="true" />
+        </pattern>
+      </extension>
+      <option name="PACKAGE_NAME" value="com.ossez.xml" />
+      <option name="MAIN_CLASS_NAME" value="com.ossez.xml.Dom4JParserUnitTest" />
+      <option name="METHOD_NAME" value="testCreateXML" />
+      <option name="TEST_OBJECT" value="method" />
+      <method v="2">
+        <option name="Make" enabled="true" />
+      </method>
+    </configuration>
+    <configuration name="Dom4JParserUnitTest.testCreateXMLFromSystemProperties" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
+      <module name="xml" />
+      <extension name="coverage">
+        <pattern>
+          <option name="PATTERN" value="com.ossez.xml.*" />
+          <option name="ENABLED" value="true" />
+        </pattern>
+      </extension>
+      <option name="PACKAGE_NAME" value="com.ossez.xml" />
+      <option name="MAIN_CLASS_NAME" value="com.ossez.xml.Dom4JParserUnitTest" />
+      <option name="METHOD_NAME" value="testCreateXMLFromSystemProperties" />
       <option name="TEST_OBJECT" value="method" />
       <method v="2">
         <option name="Make" enabled="true" />
@@ -79,38 +152,6 @@
         <option name="Make" enabled="true" />
       </method>
     </configuration>
-    <configuration name="PrimeNumbersTest.testIsPrime" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
-      <module name="codebank" />
-      <extension name="coverage">
-        <pattern>
-          <option name="PATTERN" value="com.ossez.toolkits.codebank.tests.algorithm.*" />
-          <option name="ENABLED" value="true" />
-        </pattern>
-      </extension>
-      <option name="PACKAGE_NAME" value="com.ossez.toolkits.codebank.tests.algorithm" />
-      <option name="MAIN_CLASS_NAME" value="com.ossez.toolkits.codebank.tests.algorithm.PrimeNumbersTest" />
-      <option name="METHOD_NAME" value="testIsPrime" />
-      <option name="TEST_OBJECT" value="method" />
-      <method v="2">
-        <option name="Make" enabled="true" />
-      </method>
-    </configuration>
-    <configuration name="PrimeNumbersTest.testIsPrimeCore" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
-      <module name="codebank" />
-      <extension name="coverage">
-        <pattern>
-          <option name="PATTERN" value="com.ossez.toolkits.codebank.tests.algorithm.*" />
-          <option name="ENABLED" value="true" />
-        </pattern>
-      </extension>
-      <option name="PACKAGE_NAME" value="com.ossez.toolkits.codebank.tests.algorithm" />
-      <option name="MAIN_CLASS_NAME" value="com.ossez.toolkits.codebank.tests.algorithm.PrimeNumbersTest" />
-      <option name="METHOD_NAME" value="testIsPrimeCore" />
-      <option name="TEST_OBJECT" value="method" />
-      <method v="2">
-        <option name="Make" enabled="true" />
-      </method>
-    </configuration>
     <configuration default="true" type="JetRunConfigurationType">
       <method v="2">
         <option name="Make" enabled="true" />
@@ -124,10 +165,11 @@
     </configuration>
     <recent_temporary>
       <list>
-        <item itemvalue="JUnit.PrimeNumbersTest.testIsPrime" />
-        <item itemvalue="JUnit.PrimeNumbersTest.testIsPrimeCore" />
-        <item itemvalue="Application.NaNExample" />
-        <item itemvalue="JUnit.PrimeCheckerUnitTest.whenCheckIsPrime_thenTrue" />
+        <item itemvalue="JUnit.Dom4JParserUnitTest.testCreateXMLFromSystemProperties" />
+        <item itemvalue="JUnit.Dom4JParserUnitTest.testCreateXML" />
+        <item itemvalue="JUnit.Dom4JParserUnitTest.generateNewDocumentTest" />
+        <item itemvalue="JUnit.DefaultParserUnitTest.getNodeListByTitleTest" />
+        <item itemvalue="JUnit.DefaultParserUnitTest.getFirstLevelNodeListTest" />
       </list>
     </recent_temporary>
   </component>
@@ -140,7 +182,11 @@
       <option name="presentableId" value="Default" />
       <updated>1632408056518</updated>
       <workItem from="1632408057926" duration="1144000" />
-      <workItem from="1632417263821" duration="5653000" />
+      <workItem from="1632417263821" duration="6344000" />
+      <workItem from="1632505123573" duration="254000" />
+      <workItem from="1632767316507" duration="2832000" />
+      <workItem from="1632843147814" duration="70000" />
+      <workItem from="1632921802745" duration="10209000" />
     </task>
     <task id="LOCAL-00001" summary="修改项目到不同的路径">
       <created>1632420206392</created>
@@ -177,7 +223,14 @@
       <option name="project" value="LOCAL" />
       <updated>1632423847987</updated>
     </task>
-    <option name="localTasksCounter" value="6" />
+    <task id="LOCAL-00006" summary="Check Prime numbers">
+      <created>1632426542726</created>
+      <option name="number" value="00006" />
+      <option name="presentableId" value="LOCAL-00006" />
+      <option name="project" value="LOCAL" />
+      <updated>1632426542726</updated>
+    </task>
+    <option name="localTasksCounter" value="7" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -193,12 +246,14 @@
         </entry>
       </map>
     </option>
+    <option name="oldMeFiltersMigrated" value="true" />
   </component>
   <component name="VcsManagerConfiguration">
     <MESSAGE value="修改项目到不同的路径" />
     <MESSAGE value="Update change to different folder and set to rebuild" />
     <MESSAGE value="Java number related and examples" />
     <MESSAGE value="Init commit all code" />
-    <option name="LAST_COMMIT_MESSAGE" value="Init commit all code" />
+    <MESSAGE value="Check Prime numbers" />
+    <option name="LAST_COMMIT_MESSAGE" value="Check Prime numbers" />
   </component>
 </project>
\ No newline at end of file
diff --git a/core-java-modules/core-java-io/pom.xml b/core-java-modules/core-java-io/pom.xml
index def447300d..c91439d8a4 100644
--- a/core-java-modules/core-java-io/pom.xml
+++ b/core-java-modules/core-java-io/pom.xml
@@ -287,7 +287,7 @@
         <avaitility.version>1.7.0</avaitility.version>
 
         <!-- maven plugins -->
-        <maven-javadoc-plugin.version>3.0.0-M1</maven-javadoc-plugin.version>
+        <maven-javadoc-plugin.version>3.3.1</maven-javadoc-plugin.version>
         <hsqldb.version>2.4.0</hsqldb.version>
         <esapi.version>2.1.0.1</esapi.version>
         <jmh-generator-annprocess.version>1.19</jmh-generator-annprocess.version>
diff --git a/parent-java/java-numbers-2/src/test/java/com/ossez/lossyconversion/ConversionTechniquesUnitTest.java b/parent-java/java-numbers-2/src/test/java/com/ossez/lossyconversion/ConversionTechniquesUnitTest.java
index 061f240ef2..7c01314552 100644
--- a/parent-java/java-numbers-2/src/test/java/com/ossez/lossyconversion/ConversionTechniquesUnitTest.java
+++ b/parent-java/java-numbers-2/src/test/java/com/ossez/lossyconversion/ConversionTechniquesUnitTest.java
@@ -9,7 +9,7 @@ public class ConversionTechniquesUnitTest {
 
     @Test
     public void testPrimitiveConversion() {
-        
+
         long longNum = 24;
         short shortNum = (short) longNum;
         assertEquals(24, shortNum);
@@ -17,19 +17,19 @@ public class ConversionTechniquesUnitTest {
         double doubleNum = 15.6;
         int integerNum = (int) doubleNum;
         assertEquals(15, integerNum);
-        
+
         long largeLongNum = 32768;
         short minShortNum = (short) largeLongNum;
         assertEquals(-32768, minShortNum);
-        
+
         long smallLongNum = -32769;
         short maxShortNum = (short) smallLongNum;
         assertEquals(32767, maxShortNum);
-        
+
         long maxLong = Long.MAX_VALUE;
         int minInt = (int) maxLong;
         assertEquals(-1, minInt);
-        
+
         long minLong = Long.MIN_VALUE;
         int maxInt = (int) minLong;
         assertEquals(0, maxInt);
@@ -54,15 +54,19 @@ public class ConversionTechniquesUnitTest {
         long longNum = Math.round(doubleNum);
         assertEquals(16, longNum);
     }
-    
+
     @Test
     public void testWrapperConversion() {
 
-        Double doubleNum = 10.3;
-        double dbl = doubleNum.doubleValue(); //unboxing
-        int intgr = (int) dbl; //downcasting
-        Integer intNum = Integer.valueOf(intgr);
-        assertEquals(Integer.valueOf(10), intNum);
+//        Double doubleNum = 10.3;
+//        double dbl = doubleNum.doubleValue(); //unboxing
+//        int intgr = (int) dbl; //downcasting
+//        Integer intNum = Integer.valueOf(intgr);
+//        assertEquals(Integer.valueOf(10), intNum);
+
+
+        float floatNum = 10.12f;
+        long longNum = (long) floatNum;
     }
-    
+
 }
diff --git a/pom.xml b/pom.xml
index f8c3de95e5..077a2f156e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -41,6 +41,7 @@
     <modules>
         <module>parent-java</module>
         <module>toolkits</module>
+        <module>xml</module>
     </modules>
 
     <properties>
@@ -57,7 +58,8 @@
         <!-- APACHE COMMONS-->
         <commons-io.version>2.8.0</commons-io.version>
         <commons-lang.version>2.6</commons-lang.version>
-        <commons-lang3.version>3.11</commons-lang3.version>
+        <commons-lang3.version>3.12.0</commons-lang3.version>
+        <commons-math3.version>3.6.1</commons-math3.version>
         <commons-cli.version>1.4</commons-cli.version>
         <maven-war-plugin.version>3.0.0</maven-war-plugin.version>
 
@@ -75,9 +77,10 @@
         <!-- DATA STRUCTURES -->
         <jackson.version>2.12.4</jackson.version>
 
-        <!-- Test -->
+        <!-- TEST -->
         <junit4.version>4.13.2</junit4.version>
         <junit5.version>5.7.0</junit5.version>
+        <mockito-core.version>3.12.4</mockito-core.version>
         <hamcrest.version>2.2</hamcrest.version>
         <hamcrest-all.version>1.3</hamcrest-all.version>
         <assertj.version>3.17.2</assertj.version>
@@ -95,6 +98,7 @@
         <maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
         <logback-classic.version>1.2.5</logback-classic.version>
         <rest-assured.version>3.1.1</rest-assured.version>
+
     </properties>
 
 
@@ -114,10 +118,15 @@
             <artifactId>commons-compress</artifactId>
             <version>1.20</version>
         </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
         <dependency>
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-math3</artifactId>
-            <version>3.6.1</version>
+            <version>${commons-math3.version}</version>
         </dependency>
         <dependency>
             <groupId>org.apache.velocity</groupId>
@@ -264,6 +273,12 @@
             <version>${hamcrest-all.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <version>${mockito-core.version}</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>
diff --git a/toolkits/codebank/src/test/java/com/ossez/toolkits/codebank/tests/BlackboardTest.java b/toolkits/codebank/src/test/java/com/ossez/toolkits/codebank/tests/BlackboardTest.java
index 608eecdc8d..1372fd445c 100644
--- a/toolkits/codebank/src/test/java/com/ossez/toolkits/codebank/tests/BlackboardTest.java
+++ b/toolkits/codebank/src/test/java/com/ossez/toolkits/codebank/tests/BlackboardTest.java
@@ -147,6 +147,7 @@ public class BlackboardTest {
     }
 
 
+
     /**
      * @param data
      */