Fix default categories not retreiving issue on sub tenants

components/application-mgt/io.entgra.application.mgt.core/src/main/java/io/entgra/application/mgt/core/impl/ApplicationManagerImpl.java

@@ -2223,7 +2223,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
         int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId(true);
         try {
             ConnectionManagerUtil.beginDBTransaction();
-            List<CategoryDTO> existingCategories = applicationDAO.getAllCategories(tenantId);
+            List<CategoryDTO> existingCategories = this.getAllCategories();
             List<String> existingCategoryNames = existingCategories.stream().map(CategoryDTO::getCategoryName)
                     .collect(Collectors.toList());
             if(!existingCategoryNames.containsAll(categories)){
@@ -2395,7 +2395,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
 
             List<String> updatingAppCategries = applicationUpdateWrapper.getCategories();
             if (updatingAppCategries != null){
-                List<CategoryDTO> allCategories = this.applicationDAO.getAllCategories(tenantId);
+                List<CategoryDTO> allCategories = this.getAllCategories();
                 List<String> allCategoryName = allCategories.stream().map(CategoryDTO::getCategoryName)
                         .collect(Collectors.toList());
 
@@ -2522,7 +2522,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
         int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId(true);
         try {
             ConnectionManagerUtil.openDBConnection();
-            List<CategoryDTO> categories = applicationDAO.getAllCategories(tenantId);
+            List<CategoryDTO> categories = this.getAllCategories();
             List<Integer> mappedCategoryIds = applicationDAO.getDistinctCategoryIdsInCategoryMapping();
             List<Category> responseCategoryList = new ArrayList<>();
             categories.forEach(category -> {
@@ -2800,7 +2800,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
         try {
             if (categories != null && !categories.isEmpty()) {
                 ConnectionManagerUtil.beginDBTransaction();
-                List<CategoryDTO> registeredCategories = applicationDAO.getAllCategories(tenantId);
+                List<CategoryDTO> registeredCategories = this.getAllCategories();
                 List<String> registeredCategoryNames = registeredCategories.stream().map(CategoryDTO::getCategoryName)
                         .collect(Collectors.toList());
 
@@ -3623,7 +3623,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
                 throw new BadRequestException(msg);
             }
 
-            List<CategoryDTO> registeredCategories = this.applicationDAO.getAllCategories(tenantId);
+            List<CategoryDTO> registeredCategories = this.getAllCategories();
 
             if (registeredCategories.isEmpty()) {
                 String msg = "Registered application category set is empty. Since it is mandatory to add application "
@@ -3999,4 +3999,38 @@ public class ApplicationManagerImpl implements ApplicationManager {
             ConnectionManagerUtil.closeDBConnection();
         }
     }
+
+    /**
+     * Retrieve all categories after sync default categories with database
+     * @return List<CategoryDTO> list of CategoryDTO objects
+     * @throws ApplicationManagementException throws when constructing all categories
+     */
+    private List<CategoryDTO> getAllCategories() throws ApplicationManagementException {
+        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId(true);
+        List<String> defaultCategories = ConfigurationManager.getInstance().getConfiguration().getAppCategories();
+        try {
+            ConnectionManagerUtil.getDBConnection();
+            List<CategoryDTO> existingCategoriesInDB = this.applicationDAO.getAllCategories(tenantId);
+            List<String> existingCategoryNames = existingCategoriesInDB.stream().
+                    map(CategoryDTO::getCategoryName).collect(Collectors.toList());
+            List<String> notExistingDefaultCategoryNamesInDB = defaultCategories.stream().
+                    filter(defaultCategory -> !existingCategoryNames.contains(defaultCategory)).collect(Collectors.toList());
+            if(!notExistingDefaultCategoryNamesInDB.isEmpty()) {
+                this.applicationDAO.addCategories(notExistingDefaultCategoryNamesInDB, tenantId);
+                if(log.isDebugEnabled()) {
+                    log.debug("Database successfully sync with the default categories");
+                }
+                existingCategoriesInDB = this.applicationDAO.getAllCategories(tenantId);
+            }
+            return existingCategoriesInDB;
+        } catch (DBConnectionException e) {
+            String msg = "Error occurred while getting the database connection";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        } catch (ApplicationManagementDAOException e) {
+            String msg = "Error occurred while constructing and syncing categories with the database";
+            log.error(msg, e);
+            throw new ApplicationManagementException(msg, e);
+        }
+    }
 }