boot-app | example application for Spring Boot | Object-Relational Mapping library

I made a very simple application in Spring Boot. I have used very few features offered by the framework and despite everything I have problems updating my application to the most recent versions of the framework. I also note that the support for Spring Security is disappointing because there is no dedicated community. As I wrote in the title, my needs are only 3:

1. add a remember me button during login;
2. use BCrypt to encrypt by password;
3. use spring security on the most recent version of the framework and therefore 2.6.x and possibly also 3.0.

In the past I have opened a thread on this forum because the documentation claims that support for Spring Security is here on Stackoverflow but I have not found a solution to my problem.

I can't update my webapp to Spring Boot 2.6.0 (2.5.7 works but 2.6.0 doesn't)

It is disarming to learn that Spring Boot applications are not updatable and even more disarming that the Spring Security team is not present on Stackoverflow. My request is very simple, how can I extend WebSecurityConfigurerAdapter and how can I implement UserDetailsService to get what I need with 2.6.x? Also, I wouldn't mind replacing javax with jakarta and trying Spring Boot 3 on JDK 17 but if the support is non-existent, the code I find doesn't work and I have to read a 1000 page book every new version of the framework the advantage of using a framework is null. I am very disappointed, I hope that some Spring Security developer wishes to intervene. Below you will find the commented code (see points 1 and 2).

To make the application work and not have this problem:

Spring boot application fails to start after upgrading to 2.6.0 due to circular dependency[ unresolvable circular reference]

I have to use this code:

I'm very new to Docker and I've tried everything I can think of and have gotten desperate. I really hope one of you will know what might be happening. I'm working on a project where I've created a CI pipeline using Jenkins and Docker.

I've tried many things with my spring.datasource.url.

1. using the name 'db' as that is what the service is named in docker-compose.yml
2. using grep to find the ip address of my docker0 service, my docker container, etc.
3. trying localhost as it is
4. trying different environment variables in the docker-compose file. (using username and password, not using it.)
5. trying environment variables. I can't recall the exact format, but it's something like this: jdbc:mysql://${DATABASE_HOST}:${DATABASE_PORT}/${DATABASE_NAME}?createDatabaseIfNotExist=true&useSSL=false
6. trying to install mysql on the EC2 machine.
7. Many many other things (30 tries tonight, about 60 last night). If it's on stackoverflow, I probably tried it.

Being such a noob, I'm super likely to just not know something very basic. Honestly I'm about to give up and just try to run it with an H2 database. I would hope that would work easier, but I'm still holding a sliver of hope that this may help.

My project works on my local machine using localhost in my spring.datasource.url.

localhost success on mysql

On EC2 however, I get a variation of 'refused to connect' error.

docker sad times

In spring-boot I get similar errors to these:

1. if I try a hard coded name in the connection string for the host:

I'm trying to implement an authentication system for my spring boot application using keycloak using password grant flow , and it works fine for the most part there's one bit I dont understand.

(I'm gonna reference the sample source from javacodegeeks because I'm learning it through their guide.)

In this guide: https://examples.javacodegeeks.com/keycloak-in-a-spring-boot-application/

It says to setup the following configuration on my application.properties :

How do I find the port number of my SpringBoot app so I can call it? I already tried setting -Dserver.port=8080 and--server.port=8080 in VM arguments and in src/main/resources/application.properties.

If I try to go to localhost:8080 Chrome says refused to connect. I simply want to be able to connect to my App don't know why Spring Boot made finding which port is being used so challenging.

I'm using Eclipse and the app appears to be running properly from the logs.

This simply printed 0:

The following is my Dockerfile

We have gone upgrading to spring-boot latest version to 2.6.2. However we get maven build success, we have been knocked off by BeanCreationException.

As in the first boot we were getting Circular Referrence Error, we have set the following parameter in application.properties

I stored my MySQL DB credentials in AWS secrets manager using the Credentials for other database option. I want to import these credentials in my application.properties file. Based on a few answers I found in this thread "https://stackoverflow.com/questions/56194579/how-to-integrate-aws-secret-manager-with-spring-boot-application", I did the following:

1. Added the dependency spring-cloud-starter-aws-secrets-manager-config
2. Added spring.application.name = and spring.config.import = aws-secretsmanager: in application.properties
3. Used secret keys as place holders in the following properties:

...

I created a docker compose configuration file containing a simple MySQL container and a simple Springboot application container I created. Each one works fine standalone when executed outside a docker-compose. Here is my docker-compose yaml file:

I saw this post : How to start HSQLDB in server mode from Spring boot application but can't manage to get it working.

My goal is to build a Spring boot app that

• Start HSQLDB in server mode, with file persistance (to get it back when I restart my app)
• Expose a public API that communicates with this hsqldb instance
• Let me the possibility to connect to this hsqldb server remotely, for instance using the embedded Swing app contained into hsqldb.jar.

So I tried to reproduce the marked answer of the quoted post: