lein-ring Port collision between nREPL server and web server is not reported

When the nREPL port and web server port are the same, there is no error reported and the web server fails to start. Steps to reproduce the issue are below:

$ lein new compojure foo
$ cd foo

Edit project.clj as follows:

:ring {:handler foo.handler/app
       :nrepl {:start? true :port 3000}}

Now try to start the server:

$ lein ring server-headless
Started nREPL server on port 3000
2016-12-05 19:01:22.305:INFO:oejs.Server:jetty-7.6.13.v20130916
2016-12-05 19:01:22.415:INFO:oejs.AbstractConnector:Started [email protected]:3000
Started server on port 3000

Now, connecting to nREPL server works, but the web server does not.

Dec 05 '16 13:12 kumarshantanu

I'm very low on bandwidth right now, but I did a quick look around on this and it looks like one option is handled by lein-ring and one is handled by another ring lib, so it's not surprising they're never sanity-checked against one another.

Dec 20 '16 06:12 MichaelBlume

In this case I would expect the web server to abort with an error message, not due to port number collision but because the web server failed to bind server at the port.

Dec 20 '16 06:12 kumarshantanu

Fair, I'll have a look at the library doing the serving and see if I can improve the error reporting.

On Mon, Dec 19, 2016 at 10:28 PM Shantanu Kumar [email protected] wrote:

In this case I would expect the web server to abort with an error message, not due to port number collision but because the web server failed to bind server at the port.

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Dec 20 '16 06:12 MichaelBlume

Huh, I'm confused, I see an error.

project.clj:

(defproject test-ring "0.1.0-SNAPSHOT"
  :description "FIXME: write description"
  :url "http://example.com/FIXME"
  :license {:name "Eclipse Public License"
            :url "http://www.eclipse.org/legal/epl-v10.html"}
  :plugins [[lein-ring "0.10.0"]]
  :ring {:handler clojure.core/println
         :nrepl {:start? true :port 1234}
         :port 1234}

  :dependencies [[org.clojure/clojure "1.8.0"]])

result:

[15:34][mike@mikepad:~/workspace/test-ring(master *)]$ lein ring server
Retrieving lein-ring/lein-ring/0.10.0/lein-ring-0.10.0.pom from clojars
Retrieving lein-ring/lein-ring/0.10.0/lein-ring-0.10.0.jar from clojars
2017-01-01 15:34:17.492:INFO::main: Logging initialized @728ms
Started nREPL server on port 1234
2017-01-01 15:34:19.630:INFO:oejs.Server:main: jetty-9.2.10.v20150310
2017-01-01 15:34:19.648:WARN:oejuc.AbstractLifeCycle:main: FAILED ServerConnector@4bbc21bd{HTTP/1.1}{0.0.0.0:1234}: java.net.BindException: Address already in use
java.net.BindException: Address already in use
	at sun.nio.ch.Net.bind0(Native Method)
	at sun.nio.ch.Net.bind(Net.java:433)
	at sun.nio.ch.Net.bind(Net.java:425)
	at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
	at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
	at org.eclipse.jetty.server.ServerConnector.open(ServerConnector.java:321)
	at org.eclipse.jetty.server.AbstractNetworkConnector.doStart(AbstractNetworkConnector.java:80)
	at org.eclipse.jetty.server.ServerConnector.doStart(ServerConnector.java:236)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
	at org.eclipse.jetty.server.Server.doStart(Server.java:366)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
	at ring.adapter.jetty$run_jetty.invokeStatic(jetty.clj:137)
	at ring.adapter.jetty$run_jetty.invoke(jetty.clj:100)
	at ring.server.standalone$serve$fn__2341.invoke(standalone.clj:102)
	at ring.server.standalone$try_port.invokeStatic(standalone.clj:15)
	at ring.server.standalone$try_port.invoke(standalone.clj:10)
	at ring.server.standalone$serve.invokeStatic(standalone.clj:99)
	at ring.server.standalone$serve.doInvoke(standalone.clj:75)
	at clojure.lang.RestFn.invoke(RestFn.java:423)
	at ring.server.leiningen$serve.invokeStatic(leiningen.clj:13)
	at ring.server.leiningen$serve.invoke(leiningen.clj:10)
	at user$eval5561.invokeStatic(form-init1066665034600069929.clj:1)
	at user$eval5561.invoke(form-init1066665034600069929.clj:1)
	at clojure.lang.Compiler.eval(Compiler.java:6927)
	at clojure.lang.Compiler.eval(Compiler.java:6917)
	at clojure.lang.Compiler.eval(Compiler.java:6917)
	at clojure.lang.Compiler.load(Compiler.java:7379)
	at clojure.lang.Compiler.loadFile(Compiler.java:7317)
	at clojure.main$load_script.invokeStatic(main.clj:275)
	at clojure.main$init_opt.invokeStatic(main.clj:277)
	at clojure.main$init_opt.invoke(main.clj:277)
	at clojure.main$initialize.invokeStatic(main.clj:308)
	at clojure.main$null_opt.invokeStatic(main.clj:342)
	at clojure.main$null_opt.invoke(main.clj:339)
	at clojure.main$main.invokeStatic(main.clj:421)
	at clojure.main$main.doInvoke(main.clj:384)
	at clojure.lang.RestFn.invoke(RestFn.java:421)
	at clojure.lang.Var.invoke(Var.java:383)
	at clojure.lang.AFn.applyToHelper(AFn.java:156)
	at clojure.lang.Var.applyTo(Var.java:700)
	at clojure.main.main(main.java:37)
2017-01-01 15:34:19.648:WARN:oejuc.AbstractLifeCycle:main: FAILED org.eclipse.jetty.server.Server@14e3d439: java.net.BindException: Address already in use
java.net.BindException: Address already in use
	at sun.nio.ch.Net.bind0(Native Method)
	at sun.nio.ch.Net.bind(Net.java:433)
	at sun.nio.ch.Net.bind(Net.java:425)
	at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
	at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
	at org.eclipse.jetty.server.ServerConnector.open(ServerConnector.java:321)
	at org.eclipse.jetty.server.AbstractNetworkConnector.doStart(AbstractNetworkConnector.java:80)
	at org.eclipse.jetty.server.ServerConnector.doStart(ServerConnector.java:236)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
	at org.eclipse.jetty.server.Server.doStart(Server.java:366)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
	at ring.adapter.jetty$run_jetty.invokeStatic(jetty.clj:137)
	at ring.adapter.jetty$run_jetty.invoke(jetty.clj:100)
	at ring.server.standalone$serve$fn__2341.invoke(standalone.clj:102)
	at ring.server.standalone$try_port.invokeStatic(standalone.clj:15)
	at ring.server.standalone$try_port.invoke(standalone.clj:10)
	at ring.server.standalone$serve.invokeStatic(standalone.clj:99)
	at ring.server.standalone$serve.doInvoke(standalone.clj:75)
	at clojure.lang.RestFn.invoke(RestFn.java:423)
	at ring.server.leiningen$serve.invokeStatic(leiningen.clj:13)
	at ring.server.leiningen$serve.invoke(leiningen.clj:10)
	at user$eval5561.invokeStatic(form-init1066665034600069929.clj:1)
	at user$eval5561.invoke(form-init1066665034600069929.clj:1)
	at clojure.lang.Compiler.eval(Compiler.java:6927)
	at clojure.lang.Compiler.eval(Compiler.java:6917)
	at clojure.lang.Compiler.eval(Compiler.java:6917)
	at clojure.lang.Compiler.load(Compiler.java:7379)
	at clojure.lang.Compiler.loadFile(Compiler.java:7317)
	at clojure.main$load_script.invokeStatic(main.clj:275)
	at clojure.main$init_opt.invokeStatic(main.clj:277)
	at clojure.main$init_opt.invoke(main.clj:277)
	at clojure.main$initialize.invokeStatic(main.clj:308)
	at clojure.main$null_opt.invokeStatic(main.clj:342)
	at clojure.main$null_opt.invoke(main.clj:339)
	at clojure.main$main.invokeStatic(main.clj:421)
	at clojure.main$main.doInvoke(main.clj:384)
	at clojure.lang.RestFn.invoke(RestFn.java:421)
	at clojure.lang.Var.invoke(Var.java:383)
	at clojure.lang.AFn.applyToHelper(AFn.java:156)
	at clojure.lang.Var.applyTo(Var.java:700)
	at clojure.main.main(main.java:37)
2017-01-01 15:34:19.650:INFO:oejs.ServerConnector:main: Stopped ServerConnector@4bbc21bd{HTTP/1.1}{0.0.0.0:1234}
Exception in thread "main" java.net.BindException: Address already in use, compiling:(/tmp/form-init1066665034600069929.clj:1:73)
	at clojure.lang.Compiler.load(Compiler.java:7391)
	at clojure.lang.Compiler.loadFile(Compiler.java:7317)
	at clojure.main$load_script.invokeStatic(main.clj:275)
	at clojure.main$init_opt.invokeStatic(main.clj:277)
	at clojure.main$init_opt.invoke(main.clj:277)
	at clojure.main$initialize.invokeStatic(main.clj:308)
	at clojure.main$null_opt.invokeStatic(main.clj:342)
	at clojure.main$null_opt.invoke(main.clj:339)
	at clojure.main$main.invokeStatic(main.clj:421)
	at clojure.main$main.doInvoke(main.clj:384)
	at clojure.lang.RestFn.invoke(RestFn.java:421)
	at clojure.lang.Var.invoke(Var.java:383)
	at clojure.lang.AFn.applyToHelper(AFn.java:156)
	at clojure.lang.Var.applyTo(Var.java:700)
	at clojure.main.main(main.java:37)
Caused by: java.net.BindException: Address already in use
	at sun.nio.ch.Net.bind0(Native Method)
	at sun.nio.ch.Net.bind(Net.java:433)
	at sun.nio.ch.Net.bind(Net.java:425)
	at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
	at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
	at org.eclipse.jetty.server.ServerConnector.open(ServerConnector.java:321)
	at org.eclipse.jetty.server.AbstractNetworkConnector.doStart(AbstractNetworkConnector.java:80)
	at org.eclipse.jetty.server.ServerConnector.doStart(ServerConnector.java:236)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
	at org.eclipse.jetty.server.Server.doStart(Server.java:366)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
	at ring.adapter.jetty$run_jetty.invokeStatic(jetty.clj:137)
	at ring.adapter.jetty$run_jetty.invoke(jetty.clj:100)
	at ring.server.standalone$serve$fn__2341.invoke(standalone.clj:102)
	at ring.server.standalone$try_port.invokeStatic(standalone.clj:15)
	at ring.server.standalone$try_port.invoke(standalone.clj:10)
	at ring.server.standalone$serve.invokeStatic(standalone.clj:99)
	at ring.server.standalone$serve.doInvoke(standalone.clj:75)
	at clojure.lang.RestFn.invoke(RestFn.java:423)
	at ring.server.leiningen$serve.invokeStatic(leiningen.clj:13)
	at ring.server.leiningen$serve.invoke(leiningen.clj:10)
	at user$eval5561.invokeStatic(form-init1066665034600069929.clj:1)
	at user$eval5561.invoke(form-init1066665034600069929.clj:1)
	at clojure.lang.Compiler.eval(Compiler.java:6927)
	at clojure.lang.Compiler.eval(Compiler.java:6917)
	at clojure.lang.Compiler.eval(Compiler.java:6917)
	at clojure.lang.Compiler.load(Compiler.java:7379)
	... 14 more

Jan 01 '17 23:01 MichaelBlume

I found the error with lein-ring 0.9.7, but I verified it occurs in 0.10.0 too. For me the error happens as I reported even when I change the port numbers to 1234. The project.clj is as follows:

(defproject foo "0.1.0-SNAPSHOT"
  :description "FIXME: write description"
  :url "http://example.com/FIXME"
  :min-lein-version "2.0.0"
  :dependencies [[org.clojure/clojure "1.8.0"]
                 [compojure "1.5.1"]
                 [ring/ring-defaults "0.2.1"]]
  :plugins [[lein-ring "0.10.0"]]
  :ring {:handler foo.handler/app
         :port 1234
         :nrepl {:start? true :port 1234}}
  :profiles
  {:dev {:dependencies [[javax.servlet/servlet-api "2.5"]
                        [ring/ring-mock "0.3.0"]]}})

Jan 02 '17 04:01 kumarshantanu

what lein are you using?

On Sun, Jan 1, 2017 at 8:44 PM Shantanu Kumar [email protected] wrote:

I found the error with lein-ring 0.9.7, but I verified it occurs in 0.10.0 too. For me the error happens as I reported even when I change the port numbers to 1234. The project.clj is as follows:

(defproject foo "0.1.0-SNAPSHOT" :description "FIXME: write description" :url "http://example.com/FIXME" :min-lein-version "2.0.0" :dependencies [[org.clojure/clojure "1.8.0"] [compojure "1.5.1"] [ring/ring-defaults "0.2.1"]] :plugins [[lein-ring "0.10.0"]] :ring {:handler foo.handler/app :port 1234 :nrepl {:start? true :port 1234}} :profiles {:dev {:dependencies [[javax.servlet/servlet-api "2.5"] [ring/ring-mock "0.3.0"]]}})

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Jan 02 '17 04:01 MichaelBlume

Lein 2.7.1 on Oracle JDK 1.8, OSX.

Jan 02 '17 04:01 kumarshantanu

Tried your exact project, Leiningen 2.7.1 on Java 1.8.0_111 OpenJDK 64-Bit Server VM, Ubuntu 16.04, I get a traceback

Jan 02 '17 23:01 MichaelBlume

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Port collision between nREPL server and web server is not reported

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