samuelstein

Spring Boot 4 & Jackson 3 & Redis cache

Requirement

• You use JSON serialization and deserialization for Redis values
• You use Java records

Issue

JSON deserialization for cached Redis values always throws exception like:

Caused by: java.lang.ClassCastException: class java.util.LinkedHashMap cannot be cast to class ...

samuelstein

// add a onclick event listener to an img tag and call the function nextImage with comma separated image sources

function nextImage(imageSources) {
    var images = imageSources.split(", ");
    const myImg = document.getElementById("detailImage");
    var i = myImg.dataset.currentImage || 0;

    if(i<images.length-1){
        i++;
    }else{

samuelstein

• Navigate to directus install folder
• npm install directus@10
• npx directus database migrate:latest
• pm2 stop directus
• pm2 start directus

samuelstein

Cookbook: Self-Hosting Directus 9 Headless CMS

Assumption

• Ubuntu 22.04 LTS
• PostgreSQL
• Caddy Proxy

Steps

1. Install PostgreSQL: https://www.digitalocean.com/community/tutorials/how-to-install-postgresql-on-ubuntu-22-04-quickstart
2. Install NodeJS: https://www.digitalocean.com/community/tutorials/how-to-install-node-js-on-ubuntu-22-04

samuelstein

package de.samuelstein.project.configuration;

import lombok.Getter;
import lombok.Setter;
import lombok.ToString;
import org.apache.hc.client5.http.impl.classic.HttpClientBuilder;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Primary;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;

samuelstein

.docker_build_database:
  extends: .docker_base
  variables:
    PGPASSWORD: postgres
    POSTGRES_IMAGE: "${CI_REGISTRY}/${CI_PROJECT_PATH}/postgres:latest"
    SPECIFIC_IMAGE_NAME: database
    DOCKER_TAG: latest
  before_script: &docker_build_database_before_script
    - export DOCKER_IMAGE="${CI_REGISTRY}/${CI_PROJECT_PATH}/${SPECIFIC_IMAGE_NAME}"
    - *docker_base_before_script

samuelstein

public ResponseEntity<String> doJsonRequest(HttpMethod httpMethod, String path, Object body) throws URISyntaxException {
    RestTemplate restTemplate = new RestTemplate(new HttpComponentsClientHttpRequestFactory());

    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_JSON);
    headers.add(COOKIE, getWebdriver().manage().getCookieNamed(YOUR_APP_COOKIE_NAME).toString());
    headers.setAccept(List.of(MediaType.APPLICATION_JSON, MediaType.TEXT_HTML));

    var request = new HttpEntity<>(body, headers);
    return restTemplate.exchange(new URI("http", null, hostIpAddress, port, path, null, null), httpMethod, request, String.class);

samuelstein

Type listType = new TypeToken<ArrayList<YourClass>>(){}.getType();
List<YourClass> yourClassList = new Gson().fromJson(jsonArray, listType);

samuelstein

import model.IFileWatchListener;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import java.io.IOException;
import java.nio.file.*;
import java.util.ArrayList;
import java.util.List;

public class FileWatcher extends Thread {

samuelstein

/**
     * This is a wrapper class that registers the font awesome .ttf included in the package.
     * ControlsFX loads this font dynamically at run time from a CDN. Thus, it works only if Internet
     * connection is available
     * .
     * This class registers an included version of the font. The {@link #init()} method should be called
     * during the initialization procedure of the application such that the font is available early.
     *
     * @author albrecht
     */