test with h2 database console

src/main/java/guru/springframework/spring6webapp/bootstrap/BootstrapData.java

@@ -66,9 +66,11 @@ public void run(String... args) throws Exception {
 
         savedNabil.getBooks().add(savedBookSpring6); // Add the first book to the first author
         savedTawfiq.getBooks().add(savedBookJava); // Add the second book to the second author
+        savedBookSpring6.getAuthors().add(savedNabil); // Add the first author to the first book
+        savedBookJava.getAuthors().add(savedTawfiq); // Add the second author to the second book
 
-        savedBookSpring6.setPublisher(javaPublisher); // Set the publisher for the first book
-        savedBookJava.setPublisher(savedSpringPublisher); // Set the publisher for the second book
+        savedBookSpring6.setPublisher(savedSpringPublisher); // Set the publisher for the first book
+        savedBookJava.setPublisher(savedJavaPublisher); // Set the publisher for the second book
 
         iAuthorRepositroy.save(savedNabil); // Save the updated first author
         iAuthorRepositroy.save(savedTawfiq); // Save the updated second author

src/main/resources/application.properties

@@ -1,2 +1,4 @@
 server.port=9090
-//spring.jpa.open-in-view=false
+//spring.jpa.open-in-view=false
+spring.h2.console.enabled=true
+spring.datasource.url=jdbc:h2:mem:testdb