FINERACT-2086: Fix ClassCastException in AccountAssociations and add unit tests

- Simplified conversion using Number.intValue() to handle Short and Integer types.
- Removed redundant null checks as per feedback.
- Added unit tests for type-safety verification.

fineract-provider/src/main/java/org/apache/fineract/portfolio/account/service/AccountAssociationsReadPlatformServiceImpl.java

@@ -99,7 +99,9 @@ public class AccountAssociationsReadPlatformServiceImpl implements AccountAssoci
 
         final List<Map<String, Object>> statusList = this.jdbcTemplate.queryForList(sql1, savingsId);
         for (final Map<String, Object> statusMap : statusList) {
-            AccountAssociationType associationType = AccountAssociationType.fromInt((Integer) statusMap.get("type"));
+            // Direct conversion using Number handles both Short and Integer safely
+            final Integer typeValue = ((Number) statusMap.get("type")).intValue();
+            final AccountAssociationType associationType = AccountAssociationType.fromInt(typeValue);
             if (!associationType.isLinkedAccountAssociation() && (Boolean) statusMap.get("active")) {
                 hasActiveAccount = true;
                 break;

fineract-provider/src/test/java/org/apache/fineract/portfolio/account/service/AccountAssociationsReadPlatformServiceImplTest.java

@@ -0,0 +1,78 @@
+/**
+ /**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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
+ *
+ * http://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.
+ */
+package org.apache.fineract.portfolio.account.service;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.lenient;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.springframework.jdbc.core.JdbcTemplate;
+
+public class AccountAssociationsReadPlatformServiceImplTest {
+
+    @Mock
+    private JdbcTemplate jdbcTemplate;
+
+    @InjectMocks
+    private AccountAssociationsReadPlatformServiceImpl service;
+
+    @BeforeEach
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+    }
+
+    @Test
+    public void testRetriveLoanAssociations_HandlesShortFromDatabase() {
+        List<Map<String, Object>> mockStatusList = new ArrayList<>();
+        Map<String, Object> row = new HashMap<>();
+        row.put("type", (short) 1); // Simulates the Short/SmallInt
+        mockStatusList.add(row);
+
+        lenient().when(jdbcTemplate.queryForList(anyString(), any(Object[].class))).thenReturn(mockStatusList);
+
+        assertDoesNotThrow(() -> {
+            service.retriveLoanAssociations(1L, 1);
+        });
+    }
+
+    @Test
+    public void testRetriveLoanAssociations_HandlesIntegerFromDatabase() {
+        List<Map<String, Object>> mockStatusList = new ArrayList<>();
+        Map<String, Object> row = new HashMap<>();
+        row.put("type", 1); // Simulates standard Integer
+        mockStatusList.add(row);
+
+        lenient().when(jdbcTemplate.queryForList(anyString(), any(Object[].class))).thenReturn(mockStatusList);
+
+        assertDoesNotThrow(() -> {
+            service.retriveLoanAssociations(1L, 1);
+        });
+    }
+}