helidon | Java libraries for writing microservices | Microservice library
kandi X-RAY | helidon Summary
kandi X-RAY | helidon Summary
Project Helidon is a set of Java Libraries for writing microservices. Helidon supports two programming models:. In either case your application is just a Java SE program.
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Top functions reviewed by kandi - BETA
- Generate a discovered method .
- Gets the parser iterator .
- Process persistence xml .
- Get the security definition for a method
- Add beans to the authentication details provider .
- Handles the response message .
- Update metrics for the given method .
- Drains the parts of the parser iterator and waits for it to finish .
- Verifies the signature .
- Initialize Jaeger configuration .
helidon Key Features
helidon Examples and Code Snippets
Lines of Code : 34
License : No License
Copy// 1. Create config object
Config config = new Config();
config.useClusterServers()
// use "rediss://" for SSL connection
.addNodeAddress("redis://127.0.0.1:7181");
// or read config from file
config = Config.fromYAML(new File("config-f Community Discussions
Trending Discussions on helidon
QUESTION
I'm a C developer who needs to create a basic async REST server (synchronous version works fine) in Java using the Microprofile (Helidon MP) framework. Here is my strategy to do this:
The client should do the POST call and provide JSON objects that the POST endpoint will receive. Then, the POST Endpoint method will call a business logic that should do stuff with the received JSON objects. This logic must be run asynchronously. POST should immediately return 202 Accepted. The client should check for async task completion status using a GET request (simple pooling style).
Should POST return a URI that the GET call will use? How? This GET should also provide the percentage of the task completion if the task is in progress. Finally, if the business logic is done, the GET should return the result.
I have a little previous experience with async Java, but no experience with async in this Microprofile/Java EE/Jakarta or whatever it is. I tried several different approaches (AsyncResponse, CompletitionStatus, etc.) to write this code (async POST Method) but nothing seems to be working. The skeleton of the POST functions looks like this:
...ANSWER
Answered 2021-Dec-23 at 22:10So, first things first. To run things asynchronously Jakarta EE has the annotation @Asynchronous. So, create a CDI bean with @RequestScoped, and put there your business method annotated with @Asynchronous.
Add @ApplicationScoped CDI annotation to your JAXRS service so you can inject ypur business bean.
Then, for monitoring the task, you have a couple of possibilities.
If you keep the state in a database you just make the
@GETmethod to check the state in the database. But I asume this is not your case.If the first approach doesn't fit then you have to keep the state of the different inProgress tasks somehow. I would have another
@ApplicationScopedCDI bean for that. This would contain aConcurrentHashMap, with aUUIDas the key, and as the value an Object of your own that contains the current state of any specific async job.
The UUID has to be generated in the @POST method, and sent as a parameter to the @Asynchronous, method. This way the @POST method can return the UUID, which will be used then in the @GET to request the state of the task (querying the @ApplicationScoped bean).
So the application-wide async tasks state holder should be something like this
QUESTION
I have a Helidon application and I would like to test (part of) it.
My test is annotated with @HelidonTest, and now I would like to replace one bean by a mock (and configure this mock, use all other beans as they are found, but with the mock injected).
I did figured out how to:
- Replace one bean by a test implementation (separate class): By annotating the test implementation class with
@Priority(1)and@Alternativeand supply it by annotating the test with@AddBean(MyBeanTestImpl.class).- But I can not create a mock (with Mockito) as an individual class.
- Produce a
mock(MyBean.class): By creating a producer method and annotate it with@Produces:- But it clashes with the real bean and gives: "WELD-001409: Ambiguous dependencies for type..."
- When I annotate it also with
@Alternativeit is simply ignored. - I can not annotate it with
@Priority(1), because this annotation can only be applied to types and parameters.
Any idea how I can replace one bean by a mock?
...ANSWER
Answered 2021-Dec-16 at 10:19I tried setter injection to manually inject mock beans.
Class under test
QUESTION
I'd like to set the configuration property org.glassfish.jersey.server.ServerProperties.UNWRAP_COMPLETION_STAGE_IN_WRITER_ENABLE of Jersey to true.
I've read the Helidon documentation about configuring the server and tried to add the following to my microprofile-config.properties:
ANSWER
Answered 2021-Nov-15 at 04:24In Helidon MP version 2.4.0, you'll need to follow Jersey's instructions for integrating with MicroProfile Config, bearing in mind that Helidon's MicroProfile Config implementation will already be taken care of so there's no need to duplicate that dependency.
In my opinion Helidon should take care of this for you, but in version 2.4.0 at least it does not.
QUESTION
I would like to server static content from my Helidon MP server. But I only get No handler found for path: /static/index.html.
I have configured the static resources in src/main/resources/META-INF/microprofile-config.properties:
ANSWER
Answered 2021-Oct-26 at 23:57This is a config issue, you are using io.helidon.Config.create() which doesn't support microprofile-config.properties.
If you use Server.create().start(), microprofile-config.properties will work out-of-the-box.
If you want to pass your own instance of config, you can do it like this:
QUESTION
I am trying to build a huge docker image in an optimized way by applying the principles of incremental building explained here https://www.docker.com/blog/intro-guide-to-dockerfile-best-practices/ .
Unfortunately each time I run the build command docker restarts building the image from scratch, and so I have to download again all the maven dependencies.
Here is the build command:
...ANSWER
Answered 2021-May-16 at 13:03In the documentation it is mentioned that
Each FROM instruction can use a different base, and each of them begins a new stage of the build
To check what steps are cached, run the following command
QUESTION
I am new to Helidon and i am trying to create a basic CRUD REST service using Helidon SE. I have been referring the DbClient examples in GitHib (https://github.com/oracle/helidon/tree/master/examples/dbclient) to create a basic CRUD REST Service.
I am able to do Read all/one and Delete all/one in DB but unable to do Create or Update Operation, below is the error stack which i get when trying to invoke a POST Service :
...ANSWER
Answered 2020-Nov-24 at 20:23The Pokemon class is a Java Bean and can be converted from/to JSON with JSON-B; that is what the original example does.
You need to register the Jsonb media support:
QUESTION
I'm new to Helidon MP and I'm trying to implement my first microservice. I wasn't able to find out how to debug my application, can someone point me to a good example or documentation? Is there a way to start the runtime in debug mode or something like this?
thanks in advance
...ANSWER
Answered 2020-Nov-19 at 21:54Helidon MP is not really a runtime in the sense of being an application server. It's primarily a collection of libraries you add to your project. Therefore you debug programs that use Helidon like you would debug any other Java application, i.e. by adding Java debug switches to the command line.
Here is the output from java -agentlib:jdwp=help, which should get you started with basic Java debugging:
QUESTION
I have a small application in Helidon start. It is mostly a REST interface, but I also want to start some background monitoring / logging on startup.
I would like that monitoring to be activated / deactivated by config. The issue I am facing is that the config is not being picked up if my class is instantiated manually.
Here is a very short code snippet :
Starting the application
...ANSWER
Answered 2020-Nov-13 at 20:57Your question is actually about CDI.
In order for any kind of dependency injection to work with CDI, CDI must instantiate the thing to be injected. In this case, you instantiate the thing to be injected, so CDI never "sees" it, so it is never injected.
I am speculating here, but I'm guessing your use case is really just: "I'd like my CellarMonitoring component to be notified when CDI comes up. How do I do that?"
There are many answers to that question on this site and elsewhere. Essentially you take advantage of the fact that CDI will fire an event notifying any interested listeners in the initialization of the application scope. The application scope is effectively the lifespan of the application itself, so you can think of it as a startup event.
A full CDI tutorial is beyond the scope of this question and answer, but, to cut to the chase, here's a way to do it. I have had to make various assumptions, such as that you want CellarMonitoring to be singleton-like:
QUESTION
I am getting the next issue after running:
...ANSWER
Answered 2020-Oct-13 at 08:58I fixed it following this example: https://docs.microsoft.com/en-us/azure/azure-functions/functions-create-first-azure-function-azure-cli?pivots=programming-language-java&tabs=bash%2Cbrowser
In azure-functions-maven-plugin I was missing the section under 'configuration':
QUESTION
I have a @ApplicationScoped bean in my Helidon MP microservice, is there a way to force the creation of the bean at server startup instead at first method call?
I need this bean ready and running just after server startup but every attempt I made it's inconclusive
...ANSWER
Answered 2020-Jul-17 at 14:00I found a way to solve it.
If your bean observes the initialization of ApplicationScoped it will be instantiated during startup phase. It's a trick but it works fine.
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Install helidon
You need JDK 11+ to build Helidon. You also need Maven. We recommend 3.5 or newer. Building the documentation requires the dot utility from Graphviz. This is included in many Linux distributions. For other platforms see https://www.graphviz.org/. Build scripts are located in etc/scripts. These are primarily used by our pipeline, but a couple are handy to use on your desktop to verify your changes.
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