diff --git a/core-java-modules/core-java-exceptions/pom.xml b/core-java-modules/core-java-exceptions/pom.xml
index 51c4e51341..37f65882c3 100644
--- a/core-java-modules/core-java-exceptions/pom.xml
+++ b/core-java-modules/core-java-exceptions/pom.xml
@@ -1,26 +1,35 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0"
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-    <groupId>com.baeldung.exception.numberformat</groupId>
-    <artifactId>core-java-exceptions</artifactId>
-    <version>0.0.1-SNAPSHOT</version>
-    <name>core-java-exceptions</name>
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>com.baeldung.exception.numberformat</groupId>
+	<artifactId>core-java-exceptions</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>core-java-exceptions</name>
 
-    <parent>
-        <groupId>com.baeldung</groupId>
-        <artifactId>parent-java</artifactId>
-        <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../../parent-java</relativePath>
-    </parent>
+	<parent>
+		<groupId>com.baeldung</groupId>
+		<artifactId>parent-java</artifactId>
+		<version>0.0.1-SNAPSHOT</version>
+		<relativePath>../../parent-java</relativePath>
+	</parent>
 
-    <dependencies>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>4.12</version>
-            <scope>test</scope>
-        </dependency>
-    </dependencies>
+	<properties>
+		<commons-lang3.version>3.9</commons-lang3.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>junit</groupId>
+			<artifactId>junit</artifactId>
+			<version>4.12</version>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.commons</groupId>
+			<artifactId>commons-lang3</artifactId>
+			<version>${commons-lang3.version}</version>
+		</dependency>
+	</dependencies>
 
 </project>
diff --git a/core-java-modules/core-java/src/main/java/com/baeldung/exceptions/RootCauseFinder.java b/core-java-modules/core-java-exceptions/src/main/java/com/baeldung/exceptions/RootCauseFinder.java
similarity index 100%
rename from core-java-modules/core-java/src/main/java/com/baeldung/exceptions/RootCauseFinder.java
rename to core-java-modules/core-java-exceptions/src/main/java/com/baeldung/exceptions/RootCauseFinder.java
diff --git a/core-java-modules/core-java-exceptions/src/test/java/com/baeldung/exception/error/ErrorGeneratorUnitTest.java b/core-java-modules/core-java-exceptions/src/test/java/com/baeldung/exception/error/ErrorGeneratorUnitTest.java
index de56fb7113..6dcd0d72e0 100644
--- a/core-java-modules/core-java-exceptions/src/test/java/com/baeldung/exception/error/ErrorGeneratorUnitTest.java
+++ b/core-java-modules/core-java-exceptions/src/test/java/com/baeldung/exception/error/ErrorGeneratorUnitTest.java
@@ -1,7 +1,6 @@
-package com.baeldung.error;
+package com.baeldung.exception.error;
 
 import org.junit.Assert;
-import org.junit.Before;
 import org.junit.Test;
 
 public class ErrorGeneratorUnitTest {
diff --git a/core-java-modules/core-java/src/test/java/com/baeldung/exceptions/RootCauseFinderUnitTest.java b/core-java-modules/core-java-exceptions/src/test/java/com/baeldung/exceptions/RootCauseFinderUnitTest.java
similarity index 100%
rename from core-java-modules/core-java/src/test/java/com/baeldung/exceptions/RootCauseFinderUnitTest.java
rename to core-java-modules/core-java-exceptions/src/test/java/com/baeldung/exceptions/RootCauseFinderUnitTest.java
diff --git a/core-java-modules/core-java-lambdas/README.MD b/core-java-modules/core-java-lambdas/README.MD
deleted file mode 100644
index 31790ffbb1..0000000000
--- a/core-java-modules/core-java-lambdas/README.MD
+++ /dev/null
@@ -1,3 +0,0 @@
-### Relevant Articles
-
-- [Why Do Local Variables Used in Lambdas Have to Be Final or Effectively Final?](https://www.baeldung.com/java-lambda-effectively-final-local-variables)