spring_boot | Spring Boot Examples | Messaging library

The starter page for Vaadin Flow has changed. That page now offers new projects configured only for Spring Boot. The previous version of this page offered an option for "Plain Java Servlet" as well as Spring/CDI.

The Vaadin documentation suggests using a Maven archetype manually. But the Maven repositories for com.vaadin… appear to be aimed at Vaadin 8 and earlier, with none for Vaadin 10 and later.

The Vaadin page on learning Maven shows an example using viritin-vaadin-flow-archetype as an archetype. But Viritin is a third-party project, and would add libraries I do not presently need.

➥ Is there an avenue to start a new Vaadin 16 project using only plain Java Servlets to be run on Jetty or Tomcat without Spring/CDI? (or Vaadin 17 pre-release)

Or has the Vaadin Ltd company decided to support only Spring now? (That would be most unfortunate.)

I'm developing a web application with Java and Spring Boot. What I would like to do is to add an object into the Model every time a request is received. Let me explain better what I'm doing and why I need it.

The application is an eCommerce and I need every time a page is loaded the number of items inside the cart and the number of notifications a user has got. These information are displayed inside the menu in all the pages of the web app. Right now I'm requesting these information to through an ajax call after the page has been loaded. I would like to automatically add these information inside the Model and render and return all the pages with them already present without making any further request.

I googled it and I found out that a way to solve this problem is to use an Interceptor. I implemented it following this tutorial but the only problem is that preHandle, postHandle and afterCompletion get called not only with the page requests but also with other kind of content like images, videos etc.

I have a ReactJS application running on https://localhost:8080 and i would like to POST data to my Spring Boot backend app running on https://localhost:8443, but when i try to POST data..i get this error in my browser console:

TypeError: "NetworkError when attempting to fetch resource." Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://localhost:8443/api/... (Reason: CORS request did not succeed).

My Spring Boot application not using Spring Security. I enabled HTTPS by this tutorial. I running my ReactJS application with HTTPS=true npm start and i changed the react application port like "start": "PORT=8080 react-scripts start" inpackage.json

This is my application.properties:

From the beginning, I often write Spring Boot API with many API depend on what my application needs. I know there is a type like Filter Servlet, what is it? Can anyone help me to find the difference between API with Filter and without Filter?

I have go through some research: https://www.baeldung.com/spring-boot-add-filter and https://www.tutorialspoint.com/spring_boot/spring_boot_servlet_filter.htm

I have a sample for using Servlet Filter: https://help.shopify.com/en/api/reference/products/product#create-2019-10

I am developing Spring Boot + Apache Kafka + Apache Zookeeper example. I've installed/setup Apache Zookeeper and Apache Kafka on my local windows machine. I've taken a reference from link: https://www.tutorialspoint.com/spring_boot/spring_boot_apache_kafka.htm and executed code as is:

Setup: https://medium.com/@shaaslam/installing-apache-kafka-on-windows-495f6f2fd3c8

Error:

I want to change th:text = "#{title.text}" to eng lang but it shows thai lang away I try to change code according to this exmple but it doesn't work.

out put in page login?lang=en Login controller

I trying to deploy a spring boot application (war) in tomcat 6 ( when a deploy in tomcat 7 and older i get no problem ), in fact deploying in tomcat 6 (servlet 2.5) is not possible using the new way (i will put the link that describe the new way in the bottom) because Spring Boot uses Servet 3.0 APIs to initialize the ServletContext (register Servlets etc.) so you can’t use the same application out of the box in a Servlet 2.5 container.

the solution to deploy in spring that i found in the documentation (i will put the link in the bottom) is to add web.xml.

Now, when I send a request after deploying i get this error :

I added Spring Security Starter dependency (I use Maven) to secure my app (following a tutorial); the problem is that once I add it, whenever I go to localhost to check my progress, I'm always redirected to a path that's coded in another project (I can't even find the view right now).

I currently follow the tutorial on TutorialsPoint, but I use Spring Tools Suite 4 for adding dependencies, coding and running my Spring application instead of CLI on localhost:8080.

I tried finding the view in question, tinkering with another project's web.xml, but I can't find the source of the problem, all I know is that Spring Security Starter is somehow mucking it up.

I have a strange issue. Our project has been up and running for 6 years now and some package upgrades were long overdue. App backend is written in Java 8, tests in Java and Groovy and frontend in AngularJS 1.5

App consists of 7 modules and whole project structure and build process is setup through gradle build files.

In the process of updating libraries versions biggest one was mongodb upgrade from 4.0 and spring upgrade to 5.1.3 and spring_boot version from 1.2.6 to 2.1.1.

I know, quite a few major upgrades and thanks to the all the tests we had I managed to change all our code to comply with the changes in new versions of the libraries. All tests are passing. Build of almost all the modules is working like a charm. Except for a module that consists of Groovy test classes. All the tests, when I run them from IntelliJ are passing, there are no compile or build errors.

But when I try running gradle build the task testCompileGroovy fails because the import in one of the abstract test specification classes can't be resolved. And it's the import of the main Application class that's needed for classes parameter of @SpringBootTest annotation.

Here is the libraries.gradle file with all libraries that we depend on defined...