When I launch a webapp with lein run or lein ring server, I get two processes: Leiningen itself, and my app. When I terminate the session with Ctrl+C, it terminates Leiningen and leaves my app running.
How can I terminate both processes or prevent Leiningen from spawning a process?
This sounds like https://github.com/technomancy/leiningen/issues/455 This issue is fixed on the Leiningen master branch, and also is backported to the 1.x series as 1.7.1.
What about running lein repl and then start the server by calling your main function from the REPL.
Related
I have a Django web application that executes tasks via celery. It is run with a combination of Apache, uWSGI, and Redis. For some reason, one of the tasks is being executed by the uWSGI server and the other is executed by the Python interpreter. This is causing permissions issues as uWSGI doesn't run as the same user as Python does.
What could cause the tasks to be run by different programs? Is there a setting somewhere?
Turns out, I needed to call the task with .delay() to get the Celery deamon to execute the task instead of uWSGI.
I have a Jetty 9 server embedded in my app and found that when I launch the program in eclipse and then stop it via the eclipse red button, Jetty stays running in the background.
I have to do a netstat to find which process owns the port and then do a taskkill.
Now do I configure jetty to die when the host app dies?
The Server instance should be told to stop.
server.stop();
Jetty does not know about any host app, it runs on its own daemon thread.
You could also just use java.lang.System.exit(int) to close the JVM and all threads it has running.
Killing the JVM (via the Eclipse Red Button) should kill all threads on that JVM too. If it doesn't, you have discovered a bug in Eclipse.
But before you go there, you should know that Eclipse IDE itself has it's own Eclipse Jetty server running (used for a number of things internally, and also for serving the documentation / help page).
So just the fact that you see an Eclipse Jetty instance running is misleading, it could be the one that the Eclipse IDE itself is running for its own reasons.
I have a problem compiling .clj files which reside in a project where I run the nREPL server process:
I've created a new project using lein new xxx.
In the project folder I started up an nREPL by lein repl.
In another terminal window I started a client lein repl :connect localhost:12345/repl.
I created a simple namespace file and saved it inside the project in the appropriate location:
(ns remote.one)
(def foo 42)
Now on the client terminal I called this function
(compile 'remote.one)
I've got the below exception:
CompilerException java.lang.ClassNotFoundException: remote.one, compiling:(C:\Users\xxx\AppData\Local\Temp\form-init2429492334116477513.clj:1:1)
Now I would have expected the compile call to be executed in the server not on the client. Can it be done at all?
Thanks
I just tried it and it worked for me. What happened the first time I tried it was that I missed a step: setting the current directory as the project's. I see that this step is also missing from your description, maybe that's the reason it doesn't work in your case.
Create a new project using lein new remote.
Change the current directory cd remote.
Start the nREPL server from the project folder with lein repl :headless (which I realize now is also different from your description).
Open a new console and start the nREPL client lein repl :connect localhost:port/repl in ~/..
Create the file for the ns in ~/remote/src/remote/one.clj.
From the client evaluate (compile 'remote.one).
(Using Leiningen 2.3.4 on Java 1.7.0 Java HotSpot(TM) 64-Bit Server VM and Clojure 1.5.1).
Am using jettyrunner for executing my war files.I am using command java -jar jetty runner ex.war.But am running this jetty server from my java application by executing this commands from java.My problem is at first time its working good,but the second time if i am again executing another war file with the same code its executing the older war.i have found the reason that the older jetty server is keep on running.How could i stop this server from java in order to start the jetty server for another war.
One option should be:
http://wiki.eclipse.org/Jetty/Howto/Secure_Termination
Another would be to use the ShutdownHandler:
http://git.eclipse.org/c/jetty/org.eclipse.jetty.project.git/tree/jetty-server/src/main/java/org/eclipse/jetty/server/handler/ShutdownHandler.java
Or don't use the jetty-runner directly like that from java code and just write a small embedded usage:
http://wiki.eclipse.org/Jetty/Tutorial/Embedding_Jetty
Turned out, jetty-runner.jar doesn't have a feature to stop existing jetty process ran with stop-port and stop-key.
I found the answer in https://github.com/jetty-project/jetty-documentation/blob/master/src/docbkx/administration/runner/jetty-runner.xml
Then, to stop jetty from a different terminal, you need to
supply the same port and key information. For this you'll either
need a local installation of jetty, the jetty-maven-plugin jetty-ant plugin, or write a custom class
Fortunately, I was implementing gradle build, so jetty-ant satisfied my needs.
Let's say I'm running Leiningen in interactive mode ('lein interactive') and have started a Swank Clojure server ('swank'). Now I want to kill/restart the Swank server without killing Leiningen as well. How can I do this? Is this even possible?
So far I've just been using Ctrl-C to kill both, which doesn't make Leiningen's interactive mode all that useful for me since I may as well have just ran 'lein swank' to begin with.
If you are using Slime, you can call ,rest which is bound to (restart-inferior-lisp). This will restart your swank session.
This isn't implemented yet. However, the interactive task is intended for people who don't use swank. Swank already keeps a JVM open for your project, so that kind of defeats the purpose of the interactive task.