JAVA-10605: Move multimodulemavenproject from core-java-modules to (#12309)

* JAVA-10605: Move multimodulemavenproject from core-java-modules to
maven-modules

* JAVA-10605: Move multimodulemavenproject to jdk9 build

maven-modules/multimodulemavenproject/mainappmodule/src/main/java/com/baeldung/mainappmodule/Application.java

@@ -0,0 +1,19 @@
+package com.baeldung.mainappmodule;
+
+import com.baeldung.daomodule.Dao;
+import com.baeldung.entitymodule.User;
+import com.baeldung.userdaomodule.UserDao;
+import java.util.HashMap;
+import java.util.Map;
+
+public class Application {
+    
+    public static void main(String args[]) {
+        Map<Integer, User> users = new HashMap<>();
+        users.put(1, new User("Julie"));
+        users.put(2, new User("David"));
+        Dao userDao = new UserDao(users);
+        userDao.findAll().forEach(System.out::println);
+    }
+    
+}

maven-modules/multimodulemavenproject/mainappmodule/src/main/java/module-info.java

@@ -0,0 +1,8 @@
+module com.baeldung.mainppmodule {
+    
+    requires com.baeldung.entitymodule;
+    requires com.baeldung.daomodule;
+    requires com.baeldung.userdaomodule;
+    uses com.baeldung.userdaomodule.UserDao;
+    
+}