LOPES tech

Spring Boot 3.4.0 available now

2024-12-12T14:32:00.001+00:00

What's new in 3.4

The highlights of the 3.4 release include:

Structured logging
Support for defining additional beans of the same type as those that are auto-configured
Expanded virtual thread support
Improved support for Docker Compose and Testcontainers
Numerous Actuator enhancements, including info and health information for SSL certificates
Improved image building capabilities, including out-of-the-box support for ARM
Auto-configuration for MockMvcTester, an AssertJ-based alternative to MockMvc

Source: spring.io/blog/2024/11/21/spring-boot-3-4-0-available-now#disqus_thread

Getting Started with Python in VS Code

2024-12-12T10:33:00.002+00:00

About

In the “Getting Started with Python in VS Code” video, with ‪@ReynaldAdolphe‬ , viewers learn how to efficiently set up Python development environments in Visual Studio Code, including installing necessary extensions like Python and Pylance. The video demonstrates configuring Python interpreters, managing dependencies, and writing simple Python scripts.

Sending Email Notifications with RabbitMQ Using Java (Spring Boot)

2024-08-27T15:25:00.005+01:00

In this tutorial, you will learn the following

What is async programming?
How to Setting up rabbitmq using docker
Connect it with Spring boot application
Send email notification asynchronously

Source: olaolulode.medium.com/

Building a Generative AI Application with Spring AI

2024-05-29T15:24:00.001+01:00

@Service
public class SpringAIService {

    @Autowired
    AiClient aiClient;

    @Value("${spring.ai.openai.apikey}")
    private String apiKey;

    @Value("${spring.ai.openai.imageUrl}")
    private String openAIImageUrl;


    public String getJoke(String topic){
        PromptTemplate promptTemplate = new PromptTemplate("""
                Crafting a compilation of programming jokes for my website. Would you like me to create a joke about {topic}?
                """);
        promptTemplate.add("topic", topic);
        return this.aiClient.generate(promptTemplate.create()).getGeneration().getText();
    }

    public String getBook(String category, String year) {
        PromptTemplate promptTemplate = new PromptTemplate("""
                I would like to research some books. Please give me a book about {category} in {year} to get started?
                But pick the best best you can think of. I'm a book critic. Ratings are great help.
                And who wrote it? And who help it? Can you give me a short plot summary and also it's name?
                But don't give me too much information. I don't want any spoilers.
                And please give me these details in the following JSON format: category, year, bookName, author, review, smallSummary.
                """);
        Map.of("category", category, "year", year).forEach(promptTemplate::add);
        AiResponse generate = this.aiClient.generate(promptTemplate.create());
        return generate.getGeneration().getText();
    }


    public InputStreamResource getImage(@RequestParam(name = "topic") String topic) throws URISyntaxException {
        PromptTemplate promptTemplate = new PromptTemplate("""
                 I am really bored from online memes. Can you create me a prompt about {topic}.
                 Elevate the given topic. Make it sophisticated.
                 Make a resolution of 256x256, but ensure that it is presented in json.
                 I want only one image creation. Give me as JSON format: prompt, n, size.
                """);
        promptTemplate.add("topic", topic);
        String imagePrompt = this.aiClient.generate(promptTemplate.create()).getGeneration().getText();

        RestTemplate restTemplate = new RestTemplate();
        HttpHeaders headers = new HttpHeaders();
        headers.add("Authorization", "Bearer " + apiKey);
        headers.add("Content-Type", "application/json");
        HttpEntity httpEntity = new HttpEntity<>(imagePrompt,headers);

        String imageUrl = restTemplate.exchange(openAIImageUrl, HttpMethod.POST, httpEntity, GeneratedImage.class)
                .getBody().getData().get(0).getUrl();
        byte[] imageBytes = restTemplate.getForObject(new URI(imageUrl), byte[].class);
        assert imageBytes != null;
        return new InputStreamResource(new java.io.ByteArrayInputStream(imageBytes));
    }
}

@RestController
@RequestMapping("/api/v1")
public class SpringAIController {
    @Autowired
    SpringAIService aiService;
    @GetMapping("/joke")
    public String getJoke(@RequestParam String topic) {
        return aiService.getJoke(topic);
    }
    @GetMapping("/book")
    public String getBook(@RequestParam(name = "category") String category, @RequestParam(name = "year") String year) {
        return aiService.getBook(category, year);
    }
    @GetMapping(value = "/image", produces = "image/jpeg")
    public ResponseEntity getImage(@RequestParam(name = "topic") String topic) throws URISyntaxException {
        return ResponseEntity.ok().body(aiService.getImage(topic));
    }
}

Source: medium.com/version-1

Encryption and Decryption in Java

2024-04-11T14:30:00.000+01:00

Imagine you’re sharing private information, like your credit card details or medical history.

Source: medium.com/@sharadblog

Implement JWT authentication in a Spring Boot 3 application

2024-04-04T11:54:00.000+01:00

Prerequisites

JDK 11 or higher
Maven 3.8 or higher
MySQL running on Docker
An HTTP client such as Postman, Insomnia, cURL, etc.

Source: medium.com/@tericcabrel/

Generate PDF Using Apache FOP

2024-01-17T14:35:00.000+00:00

Generate PDF Using Apache FOP

Source: malshani-wijekoon.medium.com

Code source: https://github.com/malshaniwijekoon/FOP

ChatGPT Integration with Spring Boot Application

2023-11-20T14:50:00.003+00:00

OpenAI ChatGPT APIs

API (POST https://api.openai.com/v1/chat/completions) to generate responses to a prompt.

What we need to send to invoke the OpenAI API?

Upon accessing the “Create Chat Completion” API link, the following information regarding endpoint, request, and response is visible.
Endpoint: POST https://api.openai.com/v1/chat/completions
Go to Playgroud and type any message e.g. “What is spring boot?”

https://platform.openai.com/api-keys

Source: levelup.gitconnected.com

SpringBoot - Versioning RESTful APIs

2023-10-25T09:45:00.007+01:00

API versioning with SpringBoot

Source: jackynote.medium.com

Create API request in parallel using Spring Webflux + Rest Template + Completablefuture

2023-09-07T16:56:00.001+01:00

Spring Webflux
Spring Completablefuture function
Rest Template

Link
Github: https://github.com/ashraphs/research-springboot/tree/dev/parallel- api-calling

Source: medium.com/@amirasyraf32

CompletableFuture and ExecutorService

2023-05-22T15:59:00.002+01:00

CompletableFuture and ExecutorService

ExecutorService

public static void main(String[] args) throws ExecutionException, InterruptedException {
        ExecutorService executor = Executors.newFixedThreadPool(3);
        Future futureResult = executor.submit(new Add(10, 20)); // 1
        Integer intermediateResult = futureResult.get(); // 2
        Future finalResult = executor.submit(new Multiply(intermediateResult)); // 3
        System.out.println(finalResult.get());
        executor.shutdown();
    }

CompletableFuture

public static void main(String[] args) throws ExecutionException, InterruptedException {
    Integer finalResult = CompletableFuture.supplyAsync(() -> add(10, 20))
            .thenApplyAsync(result -> multiply(result))
            .get();
    System.out.println(finalResult);
}
public static Integer add(int a, int b) {
    return a + b;

}
public static Integer multiply(int result) {
    return result * 15;
}

Source: medium.com/@anil.java.story

RabbitMQ, Apache Kafka, and ActiveMQ

2023-05-22T15:00:00.005+01:00

RabbitMQ, Apache Kafka, and ActiveMQ

Source: medium.com/

Android: Update activity with android:exported

2023-04-11T12:00:00.002+01:00

I have this error in my Android Apllication and I found this solution......

I’ve got every activity, service, and receiver setting the android:exported attribute and I’m still seeing the same error

This also happened to me.

If your using external libraries that add any of these components to your Manifest file and they aren’t prepared for this new rule you’ll need to add them individually.

Source: cafonsomota.medium.com

Android Studio error "Installed Build Tools revision 31.0.0 is corrupted"

2023-03-25T23:05:00.000+00:00

First of all, I faced this issue in Android Studio 4.2.2 and you do not need to downgrade the SDK build tool from 31 to 30 or change compile SDK version.

The main problem is the two files missing in SDK build tool 31 that are:

dx.bat
dx.jar

The solution is that these files are named d8 in the file location so changing their name to dx will solve the error.

The steps are below.

For Windows

go to the location

 "C:\Users\user\AppData\Local\Android\Sdk\build-tools\31.0.0"

find a file named d8.bat. This is a Windows batch file.
rename d8.bat to dx.bat.
in the folder lib ("C:\Users\user\AppData\Local\Android\Sdk\build-tools\31.0.0\lib")
rename d8.jar to dx.jar

Remember AppData is a hidden folder. Turn on hidden items to see the AppData folder.

For macOS or Linux

Run the following in the Terminal:

# change below to your Android SDK path
cd ~/Library/Android/sdk/build-tools/31.0.0 \
  && mv d8 dx \
  && cd lib  \
  && mv d8.jar dx.jar

Now run your project.

Source: https://stackoverflow.com/questions/68387270/android-studio-error-installed-build-tools-revision-31-0-0-is-corrupted

Spring Boot Admin Service

2023-02-17T15:42:00.002+00:00

Spring Boot Admin

Source: gitstacks.com

Python Basic concepts Complete Guide

2023-02-15T12:22:00.002+00:00

File I/O test

Python Guide Source: medium.com/@toimrank

Email in Spring Boot with Thymeleaf and Mailgun

2023-02-15T11:31:00.005+00:00

Links

mailgun.com/

Source: medium.com/@tericcabrel

Spring Boot | Properties and profiles

2023-01-31T10:33:00.001+00:00

Spring Boot | Properties and profiles

Source: medium.com/@stefan.paladuta17

Data Ingestion In Plain Java

2023-01-16T17:34:00.001+00:00

build simple data ingestion design that will be using simple Java SDK
We will Read data from remote sources and write to Database.

Source: i-sammy.medium.com
Code: github.com/imsurajmishra

How to do Asynchronous Programming With Java

2023-01-13T09:32:00.001+00:00

Using CompletableFuture to implement an asynchronous use case

Source: medium.com

Spring Boot 3 + Spring Security 6 - JWT Authentication and Authorisation

2023-01-11T11:44:00.002+00:00

Spring Boot 3 + Spring Security 6 - JWT Authentication and Authorisation

Source: @amigoscode

Using CachedRowSet in JDBC

2023-01-09T14:30:00.000+00:00

Understanding RowSet

A row set contains all data from a result set, but it can be disconnected from the database. A row set may make a connection with a database and keep the connection open during its life cycle, in which case it is called connected row set.

Understanding CachedRowSet

A CachedRowSet object is a container for rows of data that caches its rows in memory, which makes it possible to operate (scroll and update) without keeping the database connection open all the time.

A CachedRowSet object makes use of a connection to the database only briefly: while it is reading data to populate itself with rows, and again while it is committing changes to the underlying database. So the rest of the time, a CachedRowSet object is disconnected, even while its data is being modified. Hence it is called disconnected row set.

Source: codejava.net

How To retry Third-party API Elegantly in Spring Boot

2022-12-20T17:11:00.003+00:00

More info in https://github.com/spring-projects/spring-retry

Source: medium.com/@malvin.lok/

Spring Security Tutorial

2022-12-07T13:48:00.004+00:00

About:

Spring Security is a powerful and popular framework for securing Java applications. In this video, we'll show you how to get started with Spring Security, by creating a simple authentication system using basic auth and JWT.

Functional Programming Patterns with Java8 by Victor Rentea

2022-11-11T17:38:00.002+00:00