galovics commented on code in PR #2718:
URL: https://github.com/apache/fineract/pull/2718#discussion_r1015240931


##########
fineract-provider/src/main/java/org/apache/fineract/commands/service/CommandSaver.java:
##########
@@ -0,0 +1,75 @@
+/**
+ * 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.commands.service;
+
+import static 
org.apache.fineract.commands.domain.CommandProcessingResultType.ERROR;
+import static 
org.apache.fineract.commands.domain.CommandProcessingResultType.UNDER_PROCESSING;
+
+import org.apache.fineract.commands.domain.CommandSource;
+import org.apache.fineract.commands.domain.CommandSourceRepository;
+import org.apache.fineract.commands.domain.CommandWrapper;
+import org.apache.fineract.commands.exception.CommandNotFoundException;
+import org.apache.fineract.infrastructure.core.api.JsonCommand;
+import org.apache.fineract.useradministration.domain.AppUser;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+import org.springframework.transaction.annotation.Propagation;
+import org.springframework.transaction.annotation.Transactional;
+
+/**
+ * Two phase transactional command processing: save 
initial...work...finish/failed to handle idempotent requests.
+ */
+@Component
+public class CommandSaver {
+
+    @Autowired

Review Comment:
   Please us constructor injection in combination with @RequiredArgsConstructor



##########
fineract-provider/src/main/java/org/apache/fineract/infrastructure/core/exceptionmapper/DuplicateCommandExceptionMapper.java:
##########
@@ -0,0 +1,52 @@
+/**
+ * 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.exceptionmapper;
+
+import static 
org.apache.fineract.commands.domain.CommandProcessingResultType.ERROR;
+import static 
org.apache.fineract.commands.domain.CommandProcessingResultType.PROCESSED;
+import static 
org.apache.fineract.commands.domain.CommandProcessingResultType.UNDER_PROCESSING;
+
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import javax.ws.rs.core.Response.Status;
+import javax.ws.rs.ext.ExceptionMapper;
+import javax.ws.rs.ext.Provider;
+import lombok.extern.slf4j.Slf4j;
+import 
org.apache.fineract.infrastructure.core.exception.DuplicateCommandException;
+import org.springframework.stereotype.Component;
+
+@Provider
+@Component
+@Slf4j
+public class DuplicateCommandExceptionMapper implements 
ExceptionMapper<DuplicateCommandException> {
+
+    @Override
+    public Response toResponse(final DuplicateCommandException exception) {
+        log.debug("Duplicate request: {}", exception.toString());
+        if (PROCESSED.getValue() == exception.getProcessingResult() || 
ERROR.getValue() == exception.getProcessingResult()) {

Review Comment:
   Nope. Rather create specific exceptions for specific use-cases. It's always 
fishy to use an exception and pass a parameter within that to decide later on 
some logic.



##########
fineract-provider/src/main/java/org/apache/fineract/infrastructure/core/config/jpa/JpaExceptionHandler.java:
##########
@@ -0,0 +1,88 @@
+/**
+ * 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.config.jpa;
+
+import static 
org.apache.fineract.commands.domain.CommandProcessingResultType.UNDER_PROCESSING;
+
+import java.sql.SQLIntegrityConstraintViolationException;
+import javax.servlet.http.HttpServletRequest;
+import 
org.apache.fineract.infrastructure.core.exception.DuplicateCommandException;
+import org.eclipse.persistence.exceptions.DatabaseException;
+import org.eclipse.persistence.exceptions.ExceptionHandler;
+import org.springframework.beans.BeansException;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.ApplicationContextAware;
+import org.springframework.stereotype.Component;
+import org.springframework.web.context.request.RequestAttributes;
+import org.springframework.web.context.request.RequestContextHolder;
+import org.springframework.web.context.request.ServletRequestAttributes;
+
+@Component
+public class JpaExceptionHandler implements ExceptionHandler, 
ApplicationContextAware {

Review Comment:
   I don't get why you need this class especially with mixing Spring's and 
JPA's lifecycle.
   Cant you just put a try catch around the command execution and unwrap the 
proper exception there?



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