diff --git a/maven/.gitignore b/maven/.gitignore
index f843ae9109..bae0b0d7ce 100644
--- a/maven/.gitignore
+++ b/maven/.gitignore
@@ -1 +1,2 @@
-/output-resources
\ No newline at end of file
+/output-resources
+/.idea/
diff --git a/maven/custom-rule/pom.xml b/maven/custom-rule/pom.xml
new file mode 100644
index 0000000000..f76e0db11e
--- /dev/null
+++ b/maven/custom-rule/pom.xml
@@ -0,0 +1,69 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<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">
+    <parent>
+        <artifactId>maven</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>custom-rule</artifactId>
+
+    <properties>
+        <api.version>3.0.0-M2</api.version>
+        <maven.version>2.0.9</maven.version>
+    </properties>
+
+
+    <dependencies>
+        <!-- dependencies for maven plugin-->
+        <dependency>
+            <groupId>org.apache.maven.enforcer</groupId>
+            <artifactId>enforcer-api</artifactId>
+            <version>${api.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>${maven.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>${maven.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact</artifactId>
+            <version>${maven.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>${maven.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-container-default</artifactId>
+            <version>1.0-alpha-9</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <artifactId>maven-verifier-plugin</artifactId>
+                <version>${maven.verifier.version}</version>
+                <configuration>
+                    <verificationFile>../input-resources/verifications.xml</verificationFile>
+                    <failOnError>false</failOnError>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+
+
+
+</project>
\ No newline at end of file
diff --git a/maven/custom-rule/src/main/java/com/baeldung/enforcer/MyCustomRule.java b/maven/custom-rule/src/main/java/com/baeldung/enforcer/MyCustomRule.java
new file mode 100644
index 0000000000..9b72f40bf1
--- /dev/null
+++ b/maven/custom-rule/src/main/java/com/baeldung/enforcer/MyCustomRule.java
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2019 PloyRef
+ * Created by Seun Matt <smatt382@gmail.com>
+ * on 19 - 2 - 2019
+ */
+
+package com.baeldung.enforcer;
+
+import org.apache.maven.enforcer.rule.api.EnforcerRule;
+import org.apache.maven.enforcer.rule.api.EnforcerRuleException;
+import org.apache.maven.enforcer.rule.api.EnforcerRuleHelper;
+import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluationException;
+
+public class MyCustomRule implements EnforcerRule {
+
+    public void execute(EnforcerRuleHelper enforcerRuleHelper) throws EnforcerRuleException {
+
+        try {
+
+            String groupId = (String) enforcerRuleHelper.evaluate("${project.groupId}");
+
+            if (groupId == null || !groupId.startsWith("org.baeldung")) {
+                throw new EnforcerRuleException("Project group id does not start with org.baeldung");
+            }
+
+        }
+        catch (ExpressionEvaluationException ex ) {
+            throw new EnforcerRuleException( "Unable to lookup an expression " + ex.getLocalizedMessage(), ex );
+        }
+    }
+
+    public boolean isCacheable() {
+        return false;
+    }
+
+    public boolean isResultValid(EnforcerRule enforcerRule) {
+        return false;
+    }
+
+    public String getCacheId() {
+        return null;
+    }
+}
diff --git a/maven/maven-enforcer/pom.xml b/maven/maven-enforcer/pom.xml
new file mode 100644
index 0000000000..d54471e66c
--- /dev/null
+++ b/maven/maven-enforcer/pom.xml
@@ -0,0 +1,74 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<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">
+    <parent>
+        <artifactId>maven</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>maven-enforcer</artifactId>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-enforcer-plugin</artifactId>
+                <version>3.0.0-M2</version>
+                <!--<dependencies>-->
+                    <!--<dependency>-->
+                        <!--<groupId>com.baeldung</groupId>-->
+                        <!--<artifactId>custom-rule</artifactId>-->
+                        <!--<version>1.0</version>-->
+                    <!--</dependency>-->
+                <!--</dependencies>-->
+                <executions>
+                    <execution>
+                        <id>enforce</id>
+                        <goals>
+                            <goal>enforce</goal>
+                        </goals>
+                        <configuration>
+                            <rules>
+                                <banDuplicatePomDependencyVersions/>
+                                <requireMavenVersion>
+                                    <version>3.0</version>
+                                    <message>Invalid Maven version. It should, at least, be 3.0</message>
+                                </requireMavenVersion>
+                                <requireJavaVersion>
+                                    <version>1.8</version>
+                                </requireJavaVersion>
+                                <requireEnvironmentVariable>
+                                    <variableName>ui</variableName>
+                                    <level>WARN</level>
+                                </requireEnvironmentVariable>
+                                <requireEnvironmentVariable>
+                                    <variableName>cook</variableName>
+                                    <level>WARN</level>
+                                </requireEnvironmentVariable>
+                                <requireActiveProfile>
+                                    <profiles>local,base</profiles>
+                                    <message>Missing active profiles</message>
+                                    <level>WARN</level>
+                                </requireActiveProfile>
+                                <!--other rules -->
+                                <!--<myCustomRule implementation="com.baeldung.enforcer.MyCustomRule"/>-->
+                            </rules>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <artifactId>maven-verifier-plugin</artifactId>
+                <version>${maven.verifier.version}</version>
+                <configuration>
+                    <verificationFile>../input-resources/verifications.xml</verificationFile>
+                    <failOnError>false</failOnError>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+
+</project>
\ No newline at end of file
diff --git a/maven/pom.xml b/maven/pom.xml
index 01fd28db74..942bf683e2 100644
--- a/maven/pom.xml
+++ b/maven/pom.xml
@@ -4,8 +4,12 @@
     <groupId>com.baeldung</groupId>
     <artifactId>maven</artifactId>
     <version>0.0.1-SNAPSHOT</version>
-	<name>maven</name>
-    <packaging>war</packaging>
+    <modules>
+        <module>custom-rule</module>
+        <module>maven-enforcer</module>
+    </modules>
+    <name>maven</name>
+    <packaging>pom</packaging>
 
     <dependencies>
         <dependency>