diff --git a/graphql/graphql-dgs/pom.xml b/graphql/graphql-dgs/pom.xml
index 6165ae839f..56e261f14d 100644
--- a/graphql/graphql-dgs/pom.xml
+++ b/graphql/graphql-dgs/pom.xml
@@ -3,16 +3,14 @@
     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.graphql-dgs</groupId>
     <artifactId>graphql-dgs</artifactId>
     <version>1.0</version>
     <name>graphql-dgs</name>
 
     <parent>
-        <groupId>com.baeldung</groupId>
-        <artifactId>parent-modules</artifactId>
+        <groupId>com.baeldung.graphql</groupId>
+        <artifactId>graphql</artifactId>
         <version>1.0.0-SNAPSHOT</version>
-        <relativePath>../..</relativePath>
     </parent>
 
     <dependencyManagement>
@@ -30,39 +28,22 @@
     <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter</artifactId>
-            <version>2.6.2</version>
-        </dependency>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-test</artifactId>
-            <version>2.6.2</version>
-            <scope>test</scope>
+            <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
         <dependency>
             <groupId>com.netflix.graphql.dgs.codegen</groupId>
             <artifactId>graphql-dgs-codegen-client-core</artifactId>
-            <version>5.1.14</version>
-        </dependency>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-web</artifactId>
-            <version>2.6.2</version>
+            <version>${graphql-dgs-codegen-client-core.version}</version>
         </dependency>
         <dependency>
             <groupId>com.netflix.graphql.dgs</groupId>
             <artifactId>graphql-dgs-spring-boot-starter</artifactId>
-            <version>4.9.15</version>
+            <version>${graphql-dgs-spring-boot-starter.version}</version>
         </dependency>
     </dependencies>
 
     <build>
         <plugins>
-            <plugin>
-                <groupId>org.springframework.boot</groupId>
-                <artifactId>spring-boot-maven-plugin</artifactId>
-                <version>2.6.2</version>
-            </plugin>
             <plugin>
                 <groupId>io.github.deweyjose</groupId>
                 <artifactId>graphqlcodegen-maven-plugin</artifactId>
@@ -84,4 +65,9 @@
         </plugins>
     </build>
 
+    <properties>
+        <graphql-dgs-codegen-client-core.version>5.1.14</graphql-dgs-codegen-client-core.version>
+        <graphql-dgs-spring-boot-starter.version>4.9.15</graphql-dgs-spring-boot-starter.version>
+    </properties>
+
 </project>
\ No newline at end of file
diff --git a/graphql/graphql-error-handling/pom.xml b/graphql/graphql-error-handling/pom.xml
index 0cd00df3b9..ea1cf96a0e 100644
--- a/graphql/graphql-error-handling/pom.xml
+++ b/graphql/graphql-error-handling/pom.xml
@@ -3,24 +3,17 @@
          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.graphql</groupId>
     <artifactId>graphql-error-handling</artifactId>
     <version>1.0</version>
     <packaging>jar</packaging>
     <name>graphql-error-handling</name>
 
     <parent>
-        <groupId>com.baeldung</groupId>
-        <artifactId>parent-boot-2</artifactId>
-        <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../../parent-boot-2</relativePath>
+        <groupId>com.baeldung.graphql</groupId>
+        <artifactId>graphql</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
     </parent>
 
-    <properties>
-        <java.version>1.8</java.version>
-        <lombok.version>1.18.18</lombok.version>
-    </properties>
-
     <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>
@@ -35,13 +28,13 @@
         <dependency>
             <groupId>com.graphql-java</groupId>
             <artifactId>graphql-spring-boot-starter</artifactId>
-            <version>5.0.2</version>
+            <version>${graphql-spring-boot-starter.version}</version>
         </dependency>
 
         <dependency>
             <groupId>com.graphql-java</groupId>
             <artifactId>graphql-java-tools</artifactId>
-            <version>5.2.4</version>
+            <version>${graphql-java-tools.version}</version>
         </dependency>
 
         <dependency>
@@ -60,38 +53,28 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-test</artifactId>
             <scope>test</scope>
-            <version>2.6.4</version>
         </dependency>
 
         <dependency>
             <groupId>com.graphql-java</groupId>
             <artifactId>graphql-spring-boot-starter-test</artifactId>
             <scope>test</scope>
-            <version>5.0.2</version>
-        </dependency>
-
-        <dependency>
-            <groupId>org.assertj</groupId>
-            <artifactId>assertj-core</artifactId>
-            <version>3.22.0</version>
-            <scope>test</scope>
+            <version>${graphql-spring-boot-starter.version}</version>
         </dependency>
 
         <dependency>
             <groupId>org.skyscreamer</groupId>
             <artifactId>jsonassert</artifactId>
-            <version>1.5.0</version>
+            <version>${jsonassert.version}</version>
             <scope>test</scope>
         </dependency>
 
     </dependencies>
 
-    <build>
-        <plugins>
-            <plugin>
-                <groupId>org.springframework.boot</groupId>
-                <artifactId>spring-boot-maven-plugin</artifactId>
-            </plugin>
-        </plugins>
-    </build>
+    <properties>
+        <graphql-spring-boot-starter.version>5.0.2</graphql-spring-boot-starter.version>
+        <graphql-java-tools.version>5.2.4</graphql-java-tools.version>
+        <jsonassert.version>1.5.0</jsonassert.version>
+    </properties>
+
 </project>
\ No newline at end of file
diff --git a/graphql/graphql-java/pom.xml b/graphql/graphql-java/pom.xml
index 068cb04ea8..5e5bc8f648 100644
--- a/graphql/graphql-java/pom.xml
+++ b/graphql/graphql-java/pom.xml
@@ -3,16 +3,14 @@
     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.graphql</groupId>
     <artifactId>graphql-java</artifactId>
     <version>1.0</version>
     <name>graphql-java</name>
 
     <parent>
-        <groupId>com.baeldung</groupId>
-        <artifactId>parent-modules</artifactId>
+        <groupId>com.baeldung.graphql</groupId>
+        <artifactId>graphql</artifactId>
         <version>1.0.0-SNAPSHOT</version>
-        <relativePath>../../pom.xml</relativePath>
     </parent>
 
     <repositories>
@@ -44,12 +42,12 @@
         <dependency>
             <groupId>com.github.americanexpress.nodes</groupId>
             <artifactId>nodes</artifactId>
-            <version>0.5.0</version>
+            <version>${nodes.version}</version>
         </dependency>
         <dependency>
             <groupId>com.graphql-java</groupId>
             <artifactId>graphql-java</artifactId>
-            <version>11.0</version>
+            <version>${graphql-java.version}</version>
         </dependency>
         <dependency>
             <groupId>com.graphql-java</groupId>
@@ -77,16 +75,6 @@
             <artifactId>jackson-core</artifactId>
             <version>${jackson.version}</version>
         </dependency>
-        <dependency>
-            <groupId>io.ratpack</groupId>
-            <artifactId>ratpack-core</artifactId>
-            <version>${ratpack-core.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.github.americanexpress.nodes</groupId>
-            <artifactId>nodes</artifactId>
-            <version>${nodes.version}</version>
-        </dependency>
         <dependency>
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-lang3</artifactId>
@@ -117,20 +105,10 @@
             <version>${graphql-java-extended-scalars.version}</version>
         </dependency>
 
-
     </dependencies>
 
     <build>
         <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>${maven-compiler-plugin.version}</version>
-                <configuration>
-                    <source>${maven.compiler.source}</source>
-                    <target>${maven.compiler.target}</target>
-                </configuration>
-            </plugin>
             <plugin>
                 <groupId>org.eclipse.jetty</groupId>
                 <artifactId>jetty-maven-plugin</artifactId>
@@ -169,6 +147,7 @@
     </build>
 
     <properties>
+        <graphql-java.version>11.0</graphql-java.version>
         <graphql-java-tools.version>5.2.4</graphql-java-tools.version>
         <graphql-java-servlet.version>6.1.3</graphql-java-servlet.version>
         <graphql-java-annotations.version>3.0.3</graphql-java-annotations.version>
@@ -182,8 +161,6 @@
 
         <jetty-maven-plugin.version>10.0.7</jetty-maven-plugin.version>
 
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
         <graphql.java.generator.version>1.18</graphql.java.generator.version>
         <graphql-java-extended-scalars.version>2022-04-06T00-10-27-a70541e</graphql-java-extended-scalars.version>
     </properties>
diff --git a/graphql/graphql-spqr/pom.xml b/graphql/graphql-spqr/pom.xml
index c825be9b79..ad040c1557 100644
--- a/graphql/graphql-spqr/pom.xml
+++ b/graphql/graphql-spqr/pom.xml
@@ -2,30 +2,21 @@
 <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.graphql</groupId>
     <artifactId>graphql-spqr</artifactId>
     <version>1.0</version>
-    <name>graphql-java</name>
+    <name>graphql-spqr</name>
 
     <parent>
-        <groupId>com.baeldung</groupId>
-        <artifactId>parent-modules</artifactId>
+        <groupId>com.baeldung.graphql</groupId>
+        <artifactId>graphql</artifactId>
         <version>1.0.0-SNAPSHOT</version>
-        <relativePath>../..</relativePath>
     </parent>
 
     <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
-            <version>${spring-boot-version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter</artifactId>
-            <version>${spring-boot-version}</version>
         </dependency>
         <dependency>
             <groupId>io.leangen.graphql</groupId>
@@ -34,18 +25,7 @@
         </dependency>
     </dependencies>
 
-    <build>
-        <plugins>
-            <plugin>
-                <groupId>org.springframework.boot</groupId>
-                <artifactId>spring-boot-maven-plugin</artifactId>
-                <version>2.6.2</version>
-            </plugin>
-        </plugins>
-    </build>
-
     <properties>
-        <spring-boot-version>2.6.2</spring-boot-version>
         <graphql-spqr-spring-boot-starter-version>0.0.6</graphql-spqr-spring-boot-starter-version>
     </properties>
 </project>
\ No newline at end of file
diff --git a/graphql/graphql-spqr/src/main/java/com/baeldung/spqr/BookService.java b/graphql/graphql-spqr/src/main/java/com/baeldung/spqr/BookService.java
index 7c9b129491..2e9c6d8367 100644
--- a/graphql/graphql-spqr/src/main/java/com/baeldung/spqr/BookService.java
+++ b/graphql/graphql-spqr/src/main/java/com/baeldung/spqr/BookService.java
@@ -9,6 +9,7 @@ import org.springframework.stereotype.Service;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
+import java.util.stream.Collectors;
 
 @Service
 @GraphQLApi
@@ -27,8 +28,7 @@ public class BookService implements IBookService {
 
     @GraphQLQuery(name = "getAllBooks", description = "Get all books")
     public List<Book> getAllBooks() {
-        return books.stream()
-            .toList();
+        return books.stream().collect(Collectors.toList());
     }
 
     @GraphQLMutation(name = "addBook")
diff --git a/graphql/pom.xml b/graphql/pom.xml
new file mode 100644
index 0000000000..aec097752a
--- /dev/null
+++ b/graphql/pom.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns="http://maven.apache.org/POM/4.0.0"
+    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.graphql</groupId>
+    <artifactId>graphql</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+    <name>graphql</name>
+    <packaging>pom</packaging>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-boot-2</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../parent-boot-2</relativePath>
+    </parent>
+
+    <modules>
+        <module>graphql-dgs</module>
+        <module>graphql-error-handling</module>
+        <module>graphql-java</module>
+        <module>graphql-spqr</module>
+    </modules>
+
+</project>
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
index 25aeebef9d..10948514d9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -415,8 +415,7 @@
                 <!-- <module>gradle-5</module> --> <!-- Not a maven project -->
                 <!-- <module>gradle-6</module> --> <!-- Not a maven project -->
                 <!-- <module>grails</module> --> <!-- Not a maven project -->
-                <module>graphql/graphql-java</module>
-                <module>graphql/graphql-dgs</module>
+                <module>graphql</module>
                 <module>grpc</module>
                 <module>gson</module>
                 <module>guava-modules</module>
@@ -896,8 +895,7 @@
                 <!-- <module>gradle-5</module> --> <!-- Not a maven project -->
                 <!-- <module>gradle-6</module> --> <!-- Not a maven project -->
                 <!-- <module>grails</module> --> <!-- Not a maven project -->
-                <module>graphql/graphql-java</module>
-                <module>graphql/graphql-dgs</module>
+                <module>graphql</module>
                 <module>grpc</module>
                 <module>gson</module>
                 <module>guava-modules</module>