FINERACT-1724: Fineract Idempotency status null fix

- [x] Return 500 when the idempotency status is inconsistent in the database
- [x] Unit test for the mapper to avoid NullPointerException

fineract-core/src/main/java/org/apache/fineract/infrastructure/core/exception/IdempotentCommandProcessFailedException.java

@@ -34,6 +34,10 @@ public class IdempotentCommandProcessFailedException extends AbstractIdempotentC
     }
 
     public Integer getStatusCode() {
+        // If the database inconsistent we return http 500 instead of null pointer exception
+        if (statusCode == null) {
+            return 500;
+        }
         return statusCode;
     }
 }

fineract-core/src/test/java/org/apache/fineract/infrastructure/core/exception/IdempotencyCommandProcessFailedExceptionTest.java

@@ -0,0 +1,62 @@
+/**
+ * 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.infrastructure.core.exception;
+
+import static org.apache.fineract.infrastructure.core.exception.AbstractIdempotentCommandException.IDEMPOTENT_CACHE_HEADER;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import jakarta.ws.rs.core.Response;
+import java.time.LocalDate;
+import java.time.ZoneId;
+import java.util.HashMap;
+import java.util.Map;
+import org.apache.fineract.commands.domain.CommandSource;
+import org.apache.fineract.commands.domain.CommandWrapper;
+import org.apache.fineract.infrastructure.businessdate.domain.BusinessDateType;
+import org.apache.fineract.infrastructure.core.api.JsonCommand;
+import org.apache.fineract.infrastructure.core.domain.ActionContext;
+import org.apache.fineract.infrastructure.core.domain.FineractPlatformTenant;
+import org.apache.fineract.infrastructure.core.exceptionmapper.IdempotentCommandProcessFailedExceptionMapper;
+import org.apache.fineract.infrastructure.core.service.ThreadLocalContextUtil;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class IdempotencyCommandProcessFailedExceptionTest {
+
+    private final LocalDate actualDate = LocalDate.now(ZoneId.systemDefault());
+
+    @BeforeEach
+    public void setUp() {
+        ThreadLocalContextUtil.setTenant(new FineractPlatformTenant(1L, "default", "Default", "Asia/Kolkata", null));
+        ThreadLocalContextUtil.setActionContext(ActionContext.DEFAULT);
+        ThreadLocalContextUtil.setBusinessDates(new HashMap<>(Map.of(BusinessDateType.BUSINESS_DATE, actualDate)));
+    }
+
+    @Test
+    public void testInconsistentStatus() {
+        IdempotentCommandProcessFailedExceptionMapper mapper = new IdempotentCommandProcessFailedExceptionMapper();
+        CommandWrapper command = new CommandWrapper(null, null, null, null, null, null, null, null, null, null, null, null, null, null,
+                null, null, null, null);
+        CommandSource source = CommandSource.fullEntryFrom(command, JsonCommand.from("{}"), null, "dummy-key", null);
+        IdempotentCommandProcessFailedException exception = new IdempotentCommandProcessFailedException(command, source);
+        Response result = mapper.toResponse(exception);
+        assertEquals(500, result.getStatus());
+        assertEquals("true", result.getHeaderString(IDEMPOTENT_CACHE_HEADER));
+    }
+}