diff --git a/book-details/.gitignore b/.gitignore
similarity index 56%
rename from book-details/.gitignore
rename to .gitignore
index 9243c63..c2065bc 100644
--- a/book-details/.gitignore
+++ b/.gitignore
@@ -1,6 +1,9 @@
+HELP.md
 .gradle
-/build/
+build/
 !gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
 
 ### STS ###
 .apt_generated
@@ -10,17 +13,25 @@
 .settings
 .springBeans
 .sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
 
 ### IntelliJ IDEA ###
 .idea
 *.iws
 *.iml
 *.ipr
-/out/
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
 
 ### NetBeans ###
 /nbproject/private/
 /nbbuild/
 /dist/
 /nbdist/
-/.nb-gradle/
\ No newline at end of file
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..10e82c9
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 GraphQL Java
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..3310056
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+# Book details tutorial example
+
+This repository contains the source code for the tutorial "Getting started with GraphQL Java and Spring Boot" which is available here: https://www.graphql-java.com/tutorials/getting-started-with-spring-boot/ 
diff --git a/book-details/README.md b/book-details/README.md
deleted file mode 100644
index 9aaa40b..0000000
--- a/book-details/README.md
+++ /dev/null
@@ -1,5 +0,0 @@
-# Book details example 
-
-
-This is the source code for the "Getting started with GraphQL Java and Spring Boot" which 
-is available here: https://www.graphql-java.com/tutorials/getting-started-with-spring-boot/ 
\ No newline at end of file
diff --git a/book-details/build.gradle b/book-details/build.gradle
deleted file mode 100644
index c1111b5..0000000
--- a/book-details/build.gradle
+++ /dev/null
@@ -1,31 +0,0 @@
-buildscript {
-    ext {
-        springBootVersion = '2.1.2.RELEASE'
-    }
-    repositories {
-        mavenCentral()
-    }
-    dependencies {
-        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
-    }
-}
-
-apply plugin: 'java'
-apply plugin: 'org.springframework.boot'
-apply plugin: 'io.spring.dependency-management'
-
-group = 'com.graphql-java.tutorial'
-version = '0.0.1-SNAPSHOT'
-sourceCompatibility = '1.8'
-
-repositories {
-    mavenCentral()
-}
-
-dependencies {
-    implementation 'com.graphql-java:graphql-java:11.0'
-    implementation 'com.graphql-java:graphql-java-spring-boot-starter-webmvc:1.0'
-    implementation 'com.google.guava:guava:26.0-jre'
-    implementation 'org.springframework.boot:spring-boot-starter-web'
-    testImplementation 'org.springframework.boot:spring-boot-starter-test'
-}
diff --git a/book-details/gradle/wrapper/gradle-wrapper.jar b/book-details/gradle/wrapper/gradle-wrapper.jar
deleted file mode 100644
index 29953ea..0000000
Binary files a/book-details/gradle/wrapper/gradle-wrapper.jar and /dev/null differ
diff --git a/book-details/gradlew b/book-details/gradlew
deleted file mode 100755
index cccdd3d..0000000
--- a/book-details/gradlew
+++ /dev/null
@@ -1,172 +0,0 @@
-#!/usr/bin/env sh
-
-##############################################################################
-##
-##  Gradle start up script for UN*X
-##
-##############################################################################
-
-# Attempt to set APP_HOME
-# Resolve links: $0 may be a link
-PRG="$0"
-# Need this for relative symlinks.
-while [ -h "$PRG" ] ; do
-    ls=`ls -ld "$PRG"`
-    link=`expr "$ls" : '.*-> \(.*\)$'`
-    if expr "$link" : '/.*' > /dev/null; then
-        PRG="$link"
-    else
-        PRG=`dirname "$PRG"`"/$link"
-    fi
-done
-SAVED="`pwd`"
-cd "`dirname \"$PRG\"`/" >/dev/null
-APP_HOME="`pwd -P`"
-cd "$SAVED" >/dev/null
-
-APP_NAME="Gradle"
-APP_BASE_NAME=`basename "$0"`
-
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS=""
-
-# Use the maximum available, or set MAX_FD != -1 to use that value.
-MAX_FD="maximum"
-
-warn () {
-    echo "$*"
-}
-
-die () {
-    echo
-    echo "$*"
-    echo
-    exit 1
-}
-
-# OS specific support (must be 'true' or 'false').
-cygwin=false
-msys=false
-darwin=false
-nonstop=false
-case "`uname`" in
-  CYGWIN* )
-    cygwin=true
-    ;;
-  Darwin* )
-    darwin=true
-    ;;
-  MINGW* )
-    msys=true
-    ;;
-  NONSTOP* )
-    nonstop=true
-    ;;
-esac
-
-CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
-
-# Determine the Java command to use to start the JVM.
-if [ -n "$JAVA_HOME" ] ; then
-    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
-        # IBM's JDK on AIX uses strange locations for the executables
-        JAVACMD="$JAVA_HOME/jre/sh/java"
-    else
-        JAVACMD="$JAVA_HOME/bin/java"
-    fi
-    if [ ! -x "$JAVACMD" ] ; then
-        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
-
-Please set the JAVA_HOME variable in your environment to match the
-location of your Java installation."
-    fi
-else
-    JAVACMD="java"
-    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-
-Please set the JAVA_HOME variable in your environment to match the
-location of your Java installation."
-fi
-
-# Increase the maximum file descriptors if we can.
-if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
-    MAX_FD_LIMIT=`ulimit -H -n`
-    if [ $? -eq 0 ] ; then
-        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
-            MAX_FD="$MAX_FD_LIMIT"
-        fi
-        ulimit -n $MAX_FD
-        if [ $? -ne 0 ] ; then
-            warn "Could not set maximum file descriptor limit: $MAX_FD"
-        fi
-    else
-        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
-    fi
-fi
-
-# For Darwin, add options to specify how the application appears in the dock
-if $darwin; then
-    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
-fi
-
-# For Cygwin, switch paths to Windows format before running java
-if $cygwin ; then
-    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
-    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
-    JAVACMD=`cygpath --unix "$JAVACMD"`
-
-    # We build the pattern for arguments to be converted via cygpath
-    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
-    SEP=""
-    for dir in $ROOTDIRSRAW ; do
-        ROOTDIRS="$ROOTDIRS$SEP$dir"
-        SEP="|"
-    done
-    OURCYGPATTERN="(^($ROOTDIRS))"
-    # Add a user-defined pattern to the cygpath arguments
-    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
-        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
-    fi
-    # Now convert the arguments - kludge to limit ourselves to /bin/sh
-    i=0
-    for arg in "$@" ; do
-        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
-        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
-
-        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
-            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
-        else
-            eval `echo args$i`="\"$arg\""
-        fi
-        i=$((i+1))
-    done
-    case $i in
-        (0) set -- ;;
-        (1) set -- "$args0" ;;
-        (2) set -- "$args0" "$args1" ;;
-        (3) set -- "$args0" "$args1" "$args2" ;;
-        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
-        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
-        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
-        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
-        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
-        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
-    esac
-fi
-
-# Escape application args
-save () {
-    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
-    echo " "
-}
-APP_ARGS=$(save "$@")
-
-# Collect all arguments for the java command, following the shell quoting and substitution rules
-eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
-
-# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
-if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
-  cd "$(dirname "$0")"
-fi
-
-exec "$JAVACMD" "$@"
diff --git a/book-details/settings.gradle b/book-details/settings.gradle
deleted file mode 100644
index 4e6dc73..0000000
--- a/book-details/settings.gradle
+++ /dev/null
@@ -1 +0,0 @@
-rootProject.name = 'book-details'
diff --git a/book-details/src/main/java/com/graphqljava/tutorial/bookdetails/GraphQLDataFetchers.java b/book-details/src/main/java/com/graphqljava/tutorial/bookdetails/GraphQLDataFetchers.java
deleted file mode 100644
index 435794b..0000000
--- a/book-details/src/main/java/com/graphqljava/tutorial/bookdetails/GraphQLDataFetchers.java
+++ /dev/null
@@ -1,63 +0,0 @@
-package com.graphqljava.tutorial.bookdetails;
-
-import com.google.common.collect.ImmutableMap;
-import graphql.schema.DataFetcher;
-import org.springframework.stereotype.Component;
-
-import java.util.Arrays;
-import java.util.List;
-import java.util.Map;
-
-@Component
-public class GraphQLDataFetchers {
-
-    private static List<Map<String, String>> books = Arrays.asList(
-            ImmutableMap.of("id", "book-1",
-                    "name", "Harry Potter and the Philosopher's Stone",
-                    "pageCount", "223",
-                    "authorId", "author-1"),
-            ImmutableMap.of("id", "book-2",
-                    "name", "Moby Dick",
-                    "pageCount", "635",
-                    "authorId", "author-2"),
-            ImmutableMap.of("id", "book-3",
-                    "name", "Interview with the vampire",
-                    "pageCount", "371",
-                    "authorId", "author-3")
-    );
-
-    private static List<Map<String, String>> authors = Arrays.asList(
-            ImmutableMap.of("id", "author-1",
-                    "firstName", "Joanne",
-                    "lastName", "Rowling"),
-            ImmutableMap.of("id", "author-2",
-                    "firstName", "Herman",
-                    "lastName", "Melville"),
-            ImmutableMap.of("id", "author-3",
-                    "firstName", "Anne",
-                    "lastName", "Rice")
-    );
-
-    public DataFetcher getBookByIdDataFetcher() {
-        return dataFetchingEnvironment -> {
-            String bookId = dataFetchingEnvironment.getArgument("id");
-            return books
-                    .stream()
-                    .filter(book -> book.get("id").equals(bookId))
-                    .findFirst()
-                    .orElse(null);
-        };
-    }
-
-    public DataFetcher getAuthorDataFetcher() {
-        return dataFetchingEnvironment -> {
-            Map<String, String> book = dataFetchingEnvironment.getSource();
-            String authorId = book.get("authorId");
-            return authors
-                    .stream()
-                    .filter(author -> author.get("id").equals(authorId))
-                    .findFirst()
-                    .orElse(null);
-        };
-    }
-}
diff --git a/book-details/src/main/java/com/graphqljava/tutorial/bookdetails/GraphQLProvider.java b/book-details/src/main/java/com/graphqljava/tutorial/bookdetails/GraphQLProvider.java
deleted file mode 100644
index 578e62f..0000000
--- a/book-details/src/main/java/com/graphqljava/tutorial/bookdetails/GraphQLProvider.java
+++ /dev/null
@@ -1,59 +0,0 @@
-package com.graphqljava.tutorial.bookdetails;
-
-import com.google.common.base.Charsets;
-import com.google.common.io.Resources;
-import graphql.GraphQL;
-import graphql.schema.GraphQLSchema;
-import graphql.schema.idl.RuntimeWiring;
-import graphql.schema.idl.SchemaGenerator;
-import graphql.schema.idl.SchemaParser;
-import graphql.schema.idl.TypeDefinitionRegistry;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.context.annotation.Bean;
-import org.springframework.stereotype.Component;
-
-import javax.annotation.PostConstruct;
-import java.io.IOException;
-import java.net.URL;
-
-import static graphql.schema.idl.TypeRuntimeWiring.newTypeWiring;
-
-@Component
-public class GraphQLProvider {
-
-
-    @Autowired
-    GraphQLDataFetchers graphQLDataFetchers;
-
-    private GraphQL graphQL;
-
-    @PostConstruct
-    public void init() throws IOException {
-        URL url = Resources.getResource("schema.graphqls");
-        String sdl = Resources.toString(url, Charsets.UTF_8);
-        GraphQLSchema graphQLSchema = buildSchema(sdl);
-        this.graphQL = GraphQL.newGraphQL(graphQLSchema).build();
-    }
-
-    private GraphQLSchema buildSchema(String sdl) {
-        TypeDefinitionRegistry typeRegistry = new SchemaParser().parse(sdl);
-        RuntimeWiring runtimeWiring = buildWiring();
-        SchemaGenerator schemaGenerator = new SchemaGenerator();
-        return schemaGenerator.makeExecutableSchema(typeRegistry, runtimeWiring);
-    }
-
-    private RuntimeWiring buildWiring() {
-        return RuntimeWiring.newRuntimeWiring()
-                .type(newTypeWiring("Query")
-                        .dataFetcher("bookById", graphQLDataFetchers.getBookByIdDataFetcher()))
-                .type(newTypeWiring("Book")
-                        .dataFetcher("author", graphQLDataFetchers.getAuthorDataFetcher()))
-                .build();
-    }
-
-    @Bean
-    public GraphQL graphQL() {
-        return graphQL;
-    }
-
-}
diff --git a/book-details/src/main/resources/application.properties b/book-details/src/main/resources/application.properties
deleted file mode 100644
index e69de29..0000000
diff --git a/book-details/src/test/java/com/graphqljava/tutorial/bookdetails/BookDetailsApplicationTests.java b/book-details/src/test/java/com/graphqljava/tutorial/bookdetails/BookDetailsApplicationTests.java
deleted file mode 100644
index 153a7b9..0000000
--- a/book-details/src/test/java/com/graphqljava/tutorial/bookdetails/BookDetailsApplicationTests.java
+++ /dev/null
@@ -1,17 +0,0 @@
-package com.graphqljava.tutorial.bookdetails;
-
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.springframework.boot.test.context.SpringBootTest;
-import org.springframework.test.context.junit4.SpringRunner;
-
-@RunWith(SpringRunner.class)
-@SpringBootTest
-public class BookDetailsApplicationTests {
-
-    @Test
-    public void contextLoads() {
-    }
-
-}
-
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..38eb04a
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,28 @@
+plugins {
+	id 'java'
+	id 'org.springframework.boot' version '3.2.1'
+	id 'io.spring.dependency-management' version '1.1.4'
+}
+
+group = 'com.graphqljava.tutorial'
+version = '0.0.1-SNAPSHOT'
+
+java {
+	sourceCompatibility = '17'
+}
+
+repositories {
+	mavenCentral()
+}
+
+dependencies {
+	implementation 'org.springframework.boot:spring-boot-starter-graphql'
+	implementation 'org.springframework.boot:spring-boot-starter-web'
+	testImplementation 'org.springframework.boot:spring-boot-starter-test'
+	testImplementation 'org.springframework:spring-webflux'
+	testImplementation 'org.springframework.graphql:spring-graphql-test'
+}
+
+tasks.named('test') {
+	useJUnitPlatform()
+}
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..d64cd49
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/book-details/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
similarity index 74%
rename from book-details/gradle/wrapper/gradle-wrapper.properties
rename to gradle/wrapper/gradle-wrapper.properties
index a41774d..1af9e09 100644
--- a/book-details/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,7 @@
-#Thu Jan 24 10:47:04 AEDT 2019
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.2-all.zip
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000..1aa94a4
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,249 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/book-details/gradlew.bat b/gradlew.bat
similarity index 56%
rename from book-details/gradlew.bat
rename to gradlew.bat
index f955316..6689b85 100644
--- a/book-details/gradlew.bat
+++ b/gradlew.bat
@@ -1,84 +1,92 @@
-@if "%DEBUG%" == "" @echo off
-@rem ##########################################################################
-@rem
-@rem  Gradle startup script for Windows
-@rem
-@rem ##########################################################################
-
-@rem Set local scope for the variables with windows NT shell
-if "%OS%"=="Windows_NT" setlocal
-
-set DIRNAME=%~dp0
-if "%DIRNAME%" == "" set DIRNAME=.
-set APP_BASE_NAME=%~n0
-set APP_HOME=%DIRNAME%
-
-@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-set DEFAULT_JVM_OPTS=
-
-@rem Find java.exe
-if defined JAVA_HOME goto findJavaFromJavaHome
-
-set JAVA_EXE=java.exe
-%JAVA_EXE% -version >NUL 2>&1
-if "%ERRORLEVEL%" == "0" goto init
-
-echo.
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
-
-goto fail
-
-:findJavaFromJavaHome
-set JAVA_HOME=%JAVA_HOME:"=%
-set JAVA_EXE=%JAVA_HOME%/bin/java.exe
-
-if exist "%JAVA_EXE%" goto init
-
-echo.
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
-
-goto fail
-
-:init
-@rem Get command-line arguments, handling Windows variants
-
-if not "%OS%" == "Windows_NT" goto win9xME_args
-
-:win9xME_args
-@rem Slurp the command line arguments.
-set CMD_LINE_ARGS=
-set _SKIP=2
-
-:win9xME_args_slurp
-if "x%~1" == "x" goto execute
-
-set CMD_LINE_ARGS=%*
-
-:execute
-@rem Setup the command line
-
-set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
-
-@rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
-
-:end
-@rem End local scope for the variables with windows NT shell
-if "%ERRORLEVEL%"=="0" goto mainEnd
-
-:fail
-rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
-rem the _cmd.exe /c_ return code!
-if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
-exit /b 1
-
-:mainEnd
-if "%OS%"=="Windows_NT" endlocal
-
-:omega
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 0000000..e0f4815
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1 @@
+rootProject.name = 'bookDetails'
diff --git a/src/main/java/com/graphqljava/tutorial/bookDetails/Author.java b/src/main/java/com/graphqljava/tutorial/bookDetails/Author.java
new file mode 100644
index 0000000..505aafa
--- /dev/null
+++ b/src/main/java/com/graphqljava/tutorial/bookDetails/Author.java
@@ -0,0 +1,18 @@
+package com.graphqljava.tutorial.bookDetails;
+
+import java.util.Arrays;
+import java.util.List;
+
+record Author(String id, String firstName, String lastName) {
+
+    private static List<Author> authors = Arrays.asList(
+        new Author("author-1", "Joanne", "Rowling"),
+        new Author("author-2", "Herman", "Melville"),
+        new Author("author-3", "Anne", "Rice")
+    );
+
+    public static Author getById(String id) {
+        return authors.stream().filter(author -> author.id().equals(id)).findFirst().orElse(null);
+    }
+
+}
\ No newline at end of file
diff --git a/src/main/java/com/graphqljava/tutorial/bookDetails/Book.java b/src/main/java/com/graphqljava/tutorial/bookDetails/Book.java
new file mode 100644
index 0000000..8001f5f
--- /dev/null
+++ b/src/main/java/com/graphqljava/tutorial/bookDetails/Book.java
@@ -0,0 +1,18 @@
+package com.graphqljava.tutorial.bookDetails;
+
+import java.util.Arrays;
+import java.util.List;
+
+record Book(String id, String name, int pageCount, String authorId) {
+
+    private static List<Book> books = Arrays.asList(
+        new Book("book-1", "Harry Potter and the Philosopher's Stone", 223, "author-1"),
+        new Book("book-2", "Moby Dick", 635, "author-2"),
+        new Book("book-3", "Interview with the vampire", 371, "author-3")
+    );
+
+    public static Book getById(String id) {
+        return books.stream().filter(book -> book.id().equals(id)).findFirst().orElse(null);
+    }
+
+}
\ No newline at end of file
diff --git a/src/main/java/com/graphqljava/tutorial/bookDetails/BookController.java b/src/main/java/com/graphqljava/tutorial/bookDetails/BookController.java
new file mode 100644
index 0000000..f7db4b0
--- /dev/null
+++ b/src/main/java/com/graphqljava/tutorial/bookDetails/BookController.java
@@ -0,0 +1,21 @@
+package com.graphqljava.tutorial.bookDetails;
+
+import org.springframework.graphql.data.method.annotation.Argument;
+import org.springframework.graphql.data.method.annotation.QueryMapping;
+import org.springframework.graphql.data.method.annotation.SchemaMapping;
+import org.springframework.stereotype.Controller;
+
+@Controller
+class BookController {
+
+    @QueryMapping
+    public Book bookById(@Argument String id) {
+        return Book.getById(id);
+    }
+
+    @SchemaMapping
+    public Author author(Book book) {
+        return Author.getById(book.authorId());
+    }
+
+}
\ No newline at end of file
diff --git a/book-details/src/main/java/com/graphqljava/tutorial/bookdetails/BookDetailsApplication.java b/src/main/java/com/graphqljava/tutorial/bookDetails/BookDetailsApplication.java
similarity index 53%
rename from book-details/src/main/java/com/graphqljava/tutorial/bookdetails/BookDetailsApplication.java
rename to src/main/java/com/graphqljava/tutorial/bookDetails/BookDetailsApplication.java
index f130a6a..0c65c4d 100644
--- a/book-details/src/main/java/com/graphqljava/tutorial/bookdetails/BookDetailsApplication.java
+++ b/src/main/java/com/graphqljava/tutorial/bookDetails/BookDetailsApplication.java
@@ -1,4 +1,4 @@
-package com.graphqljava.tutorial.bookdetails;
+package com.graphqljava.tutorial.bookDetails;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
@@ -6,9 +6,8 @@
 @SpringBootApplication
 public class BookDetailsApplication {
 
-    public static void main(String[] args) {
-        SpringApplication.run(BookDetailsApplication.class, args);
-    }
+	public static void main(String[] args) {
+		SpringApplication.run(BookDetailsApplication.class, args);
+	}
 
 }
-
diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties
new file mode 100644
index 0000000..1bd50b3
--- /dev/null
+++ b/src/main/resources/application.properties
@@ -0,0 +1 @@
+spring.graphql.graphiql.enabled=true
diff --git a/book-details/src/main/resources/schema.graphqls b/src/main/resources/graphql/schema.graphqls
similarity index 98%
rename from book-details/src/main/resources/schema.graphqls
rename to src/main/resources/graphql/schema.graphqls
index 85bb6ad..a6613e5 100644
--- a/book-details/src/main/resources/schema.graphqls
+++ b/src/main/resources/graphql/schema.graphqls
@@ -13,4 +13,4 @@ type Author {
     id: ID
     firstName: String
     lastName: String
-}
\ No newline at end of file
+}
diff --git a/src/test/java/com/graphqljava/tutorial/bookDetails/BookDetailsApplicationTests.java b/src/test/java/com/graphqljava/tutorial/bookDetails/BookDetailsApplicationTests.java
new file mode 100644
index 0000000..db9922b
--- /dev/null
+++ b/src/test/java/com/graphqljava/tutorial/bookDetails/BookDetailsApplicationTests.java
@@ -0,0 +1,13 @@
+package com.graphqljava.tutorial.bookDetails;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class BookDetailsApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}