spring-react | App with Spring , React JS , Gradle and Webpack | Frontend Framework library
kandi X-RAY | spring-react Summary
kandi X-RAY | spring-react Summary
App with Spring, React JS, Gradle and Webpack
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Top functions reviewed by kandi - BETA
- Logs a user
- Entry point for the application
- Adds the resource handlers
- Add view controller
- Customize container factory
spring-react Key Features
spring-react Examples and Code Snippets
Community Discussions
Trending Discussions on spring-react
QUESTION
Just starting to understand reactive programming with Reactor and I've come across this code snippet from a tutorial here building-a-chat-application-with-angular-and-spring-reactive-websocket
...ANSWER
Answered 2021-May-20 at 13:21The difference is much more conventional rather than functional - the difference being side-effects vs a final consumer.
The doOnXXX series of methods are meant for user-designed side-effects as the reactive chain executes - logging being the most normal of these, but you may also have metrics, analytics, etc. that require a view into each element as it passes through. The key with all of these is that it doesn't make much sense to have any of these as a final consumer (such as the println() in your above example.)
On the contrary, the subscribe() consumers are meant to be a "final consumer", and usually called by your framework (such as Webflux) rather than by user code - so this case is a bit of an exception to that rule. In this case they're actively passing the messages in this reactive chain to another sink for further processing - so it doesn't make much sense to have this as a "side-effect" style method, as you wouldn't want the Flux to continue beyond this point.
(Addendum: As said above, the normal approach with reactor / Webflux is to let Webflux handle the subscription, which isn't what's happening here. I haven't looked in detail to see if there's a more sensible way to achieve this without a user subscription, but in my experience there usually is, and calling subscribe manually is usually a bit of a code smell as a result. You should certainly avoid it in your own code wherever you can.)
QUESTION
I'm following this example https://github.com/hantsy/spring-reactive-sample/blob/master/boot-exception-handler/src/main/java/com/example/demo/DemoApplication.java ...which works -- sets the createDate MongoDB field on creation. The version there is 2.1.6.RELEASE. However, when I upgrade this to 2.4.2, createDate is no longer set. There are no warnings, it seems just to have stopped working.
The model class is:
...ANSWER
Answered 2021-Jan-25 at 16:34Resolved by using the new @EnableReactiveMongoAuditing annotation, plus a bean like
QUESTION
I have 2 Spring-Boot-Reactive apps, one server and one client; the client calls the server like so:
...ANSWER
Answered 2021-Jan-25 at 06:50I've got it running by changing 2 points:
- First: I've changed the
contenttype of the response of your/thingsendpoint, to:
QUESTION
I'm working on a micro service powered by SpringMVC and Spring Cloud Kafka.
For simplicity I will only focus on the part that makes HTTP request.
I have a binding function like the following (please note that I'm using the functional style binding).
...ANSWER
Answered 2020-Dec-23 at 15:07The default max.poll.interval is 5 minutes; you can increase it or reduce max.poll.records. You can also set a timeout on the rest call.
QUESTION
My understanding of the Bulkhead pattern is that it's a way of isolating thread pools. Hence, interactions with different services use different thread pools: if the same thread pool is shared, one service timing out constantly might exhaust the entire thread pool, taking down the communication with the other (healthy) services. By using different ones, the impact is reduced.
Given my understanding, I don't see any reason to apply this pattern to non-blocking applications as threads don't get blocked and, therefore, thread pools wouldn't get exhausted either way.
I would appreciate if someone could clarify this point in case I'm missing something.
EDIT (explain why it's not a duplicate):
There's another (more generic) question asking about why using Circuit-Breaker and Bulkhead patterns with Reactor. The question was answered in a very generic way, explaining why all Resilience4J decorators are relevant when working with Reactor.
My question, on the other hand, is particular to the Bulkhead pattern, as I don't understand its benefits on scenarios where threads don't get blocked.
...ANSWER
Answered 2020-Oct-23 at 07:58The Bulkhead pattern is not only about isolating thread pools.
Think of Little's law: L = λ * W
Where:
L – the average number of concurrent tasks in a queuing system
λ – the average number of tasks arriving at a queuing system per unit of time
W – the average service time a tasks spends in a queuing system
The Bulkhead pattern is more about controlling L in order to prevent resource exhaustion. This can be done by using:
- bounded queues + thread pools
- semaphores
Even non-blocking applications require resources per concurrent task which you might want to restrict. Semaphores could help to restrict the number of concurrent tasks.
The RateLimiter pattern is about controlling λ and the TimeLimiter about controlling the maximum time a tasks is allowed to spend.
An adaptive Bulkhead can even replace RateLimiters. Have a look at this awesome talk "Stop Rate Limiting! Capacity Management Done Right" by Jon Moore"
We are currently developing an AdaptiveBulkhead in Resilience4j which adapts the concurrency limit of tasks dynamically. The implementation is comparable to TCP Congestion Control algorithms which are using an additive increase/multiplicative decrease (AIMD) scheme to dynamically adapt a congestion window. But the AdaptiveBulkhead is of course protocol-agnostic.
QUESTION
I am trying to write a reactive Spring Cloud Function service using RabbitMQ which will consume off one queue and produce to an exchange.
I have 2 questions.
- Why am I getting the error below in the logs.
- How would I do a reject with a doOnError? The doOnError has access to only the throwable, and not the message to do a reject.
Here is the application code. It is copied from this question Spring Reactive Stream - Unexpected Shutdown
...ANSWER
Answered 2020-Sep-15 at 19:23Figured out how to have a Function send messages to a DLQ when failed. I added a Consumer also since they are related.
I believe we need to ack or reject the message, but when rejecting we want to return a Flux.empty() so nothing gets published to the downstream exchange.
Code rejects any message with fail as payload, and acks any other message.
QUESTION
CircleCI introduces orb in 2.1, I am trying to add Circle Ci config my sample project.
But in my testing codes, I have used test containers to simplify the dependent config of my integration tests.
When committing my codes, the Circle CI running is failed.
...ANSWER
Answered 2020-Jul-14 at 02:30Got it run myself.
The maven orb provides reusable jobs and commands, but by default, it used a JDK executor, does not provide a Docker runtime.
My solution is giving up the reusable job, and reuse some commands from the maven orb in your own jobs.
QUESTION
I tried to upgrade my tests to use TestConainers and Spring @DynamicPropertySource.
ANSWER
Answered 2020-Apr-22 at 06:07You are defining junit.jupiter.testinstance.lifecycle.default=per_class in your junit-platform.properties. Setting this back to per_method or just delete the line would fix your problem.
Testcontainers JUnit extension does not really play well with this setting if you do not start to take control over the container lifecycle by yourself.
But mixing with with the strict restriction of having a static method for the @DynamicPropertySource would require to start the container upfront the properties registration. This looks, at least to me, not ideal for a clean test structure.
QUESTION
The following code produces unexpected cyclic dependency between receiverOptions and template:
Surprisingly it works if kafkaProps are removed from spring context.
Looks like some auto-configuration is adding an unnecessary dependency from template to the receiverOptions.
Please suggest a proper way to configure ReactiveKafkaConsumerTemplate.
...ANSWER
Answered 2020-Jan-08 at 13:31I suppose Spring doesn't know which Map to inject. Try to add @Qualifier("kafkaProps") to the kafkaProps parameter:
QUESTION
I was trying to taste R2dbc and using Embedded H2 like:
...ANSWER
Answered 2020-Jan-05 at 04:39From the official documentation
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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Install spring-react
Go to your terminal and run the command ./gradlew npm_install to get all node_modules set up.
To get the app up and running in dev mode to the following - In one terminal, start the spring app to act as our backend - ./gradlew bootRun. In another terminal window, let us start our front end in hot loader mode. We are using webpack-dev-server to help us with it. Run the command ./gradlew start. Done. the terminal window will open a browser window pointing to http://localhost:3030/ and you will see a simple login page. Use admin/admin to get to the welcome page.
To run the react tests, execute ./gradlew check
To compile the whole app into a single executable, run ./gradlew assemble. This will bundle your react app into a single javascript file, create the index page with correct tag for bundled js, and copy these files to jar's static folder.
Once compiled run - java -jar spring-app/build/libs/spring-react-0.0.1.jar and you will have your app running on http://localhost:8080/.
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