I’m struggling to identify the right annotations to use to map a star schema with Spring Boot JPA. Let’s consider 3 tables: DIM_One (1)——–(1..n) FACT (1..n) ———— (1) DIM_Two DIM_One and DIM_Two both have an id that is their primary key. FACT’s primar…
Tag: spring-boot
Why deploying a spring boot (Java) application to Googles App Engine gives error for both Flexible and Standard environment?
It is a Spring boot Java application using Maven. I am using Intelij for developement. I am availing $300 as I got by default from GCP and using it. For a flexible environment, the app.yaml configuration is Error as below: The requested amount of instances has exceeded GCE’s default quota When I using a…
How to use Class getMethod with lombok @Data
I am trying to call Class getMethod() method with lombok @Data to call getter of model but i got NoSuchMethod exception. Below are my classes: Model class: usage: Exception: Answer You can use below code: for better explaination click here
How to Avoid nested for Loops in java to get the heirarchical data?
// This method will return the list of reference names, in this method I wrote the code using nested //for-loops this handle only 3 subfolders set what if there is one more subfolder and how to handle it //without for loops, OverAll I should handle it dynamically //for-loops this handle only 3 subfolders set …
Is there a way in which we can check for presence of data in application.properties file in Spring Boot Project before the tomcat server starts?
I am writing a Spring Boot project to Run a Cloud Config Server and 3 Micro-services to run as a Client. I would want to check availability of all properties in application.properties or yaml file before starting the tomcat server. We already have a similar one for Database Startup Validation, but here I am t…
How do I avoid the white label error(404) on localhost:8080?
I have been looking around here and in other forums for hours and I still haven’t found what I am doing wrong. I have built a simple Spring-Boot application with MongoDB and I have no errors in the console when i run it but i keep getting the white label error no matter what I do. My main and controller
JPA Entity that has a OneToMany relationship and want to use DTO
I have an entity called “Review” that has a OneToOne relationship with a “User” entity and a OneToMany relationship with a “ReviewStage” entity. I have implemented a DTO pattern so, I also have ReviewDTO which is actually what is being sent to the UI. I am using mapstruct t…
I have an error but dependencies include in gradle root and gradle module config, why?
I have root config gradle.build and have build.gradle in module After download dependencies and add in models annotations like @Entity, @Table @Id and etc. i have an error: cannot find symbol @Entity ^ symbol: class Entity But i have spring-boot-starter-jpa in dependencies, i don’t know why in module i …
The dreaded Java SpringBoot app not connecting to MySQL with Docker-compose java.net.ConnectException: Connection refused
I have been struggling with the following issue – the dreaded Java SpringBoot app not connecting to MySQL with docker compose exceptions: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure JDBCConnectionException: Unable to open JDBC Connection for DDL execution java.net.C…
Issues in serializing API request argument in Spring boot application
I have written one aspect to serialize the request arguments for APIs in Spring boot application, in DB as follows: The above code snippet is failing if we get HttpServletRequest/ByteStream as a request argument. For example, for byte stream I am getting following exceptions: For the request type of HttpServl…