websocket | PHP websocket server & client | Websocket library

I used pip install eth-brownie and it worked fine, I didnt need to downgrade. Im new to this maybe I could be wrong but it worked fine with me.

The message typically entails that your JAVA_HOME environment variable points to a different Java version.

Here are the steps to follow:

• Close IntelliJ IDEA
• Open a terminal window and check your JAVA_HOME variable value:
  • *nix system: echo $JAVA_HOME
  • Windows system: echo %JAVA_HOME%
• The JAVA_HOME path should be pointing to a different path, then set it to the openjdk-17 path:
  • *nix system: export JAVA_HOME=/path/to/openjdk-17
  • Windows system: set JAVA_HOME=path\to\openjdk-17
• Open your project again in IntelliJ IDEA
• Make sure to set both source and target compatibility versions (not only the sourceCompatibility)

You should be able to build your project.

You may need also to instruct Gradle to use a different JVM than the one it uses itself by setting the Java plugin toolchain to your target version:

At the time of release of Apollo Server 3, the protocol used in the graphql-ws library is not yet supported by GraphQL Playground or Apollo Explorer.

see here

It's only advisable to use graphql-ws if interacting with subscriptions via playground is not of much use to you and you're okay interacting with subscriptions solely from your own client that has been setup to use graphql-ws.

To setup your client to use graphql-ws with Apollo. see here.

There is no problem with your websocket route. Could you please share how you are triggering this route? Websocket is a different protocol and I'm suspecting that you are using a HTTP client to test websocket. For example in Postman:

Postman New Screen

HTTP requests are different than websocket requests. So, you should use appropriate client to test websocket.

I started digging in Spring Security libraries, and noticed the session cookie was being set in HttpSessionRequestCache.saveRequest(...) method:

Keep it easy.
Certs inside your application are complex - they are hard to manage and you will get problems to run your application in a modern cloud environment (start new environments, renew certs, scale your application, ...).

Simple conclusion: Dont implement any certs.

As Mike already pointed out in the comments: WebSockets are just upgraded HTTP(S) connections. A normal webserver (nginx, apache) takes care about the certs. It can be done in kubernetes (as ingress-controller) or with a "bare-metal" webserver.
Both of them should act as a reverse-proxy. This means: Your java-application doesn't know anything about certs. It has just unencrypted connections - like in your code on port 6868.
But the client will not use this port. 6868 is only internally reachable.

The client will call your reverse-proxy at the normal HTTPS port (=443). The reverse-proxy will forward the connection to your java-application.

Here some links for further information:

• nginx reverse-proxy
• nginx reverse-proxy for websocket
• tutorial for java behind reverse-proxy
• LetsEncrypt for automatic and free certs

Downgrade the plugin to kubernetes-client-api:5.10.1-171.vaa0774fb8c20. The latest one has the compatibility issue as of now.

new info: The issue is now solved with upgrading the Kubernetes plugin to version: 1.31.2 https://issues.jenkins.io/browse/JENKINS-67483

Your title says you are using Java 9. With Activiti 6 you will have to use JDK 1.8 (Java 8).

You can run the code snippet below to see it in operation. I have also attached a screenshot of a console showing the output of values.