Help fixing dependency conflicts with Duct and Datomic Client Pro?

teodorlu · May 6, 2019, 11:20am

Hello!

I’m facing dependency conflicts with a near minimal setup with Duct and Datomic Client. On the bad side, I’m a little lost fumbling around with :exclusions. On the bright side, Duct and Datomic are well known, and the reproduction example is small.

Reproducing

lein new duct dep-mwe +site
# Add [com.datomic/client-pro "0.8.28"] to project.clj :dependencies
cd dep-mwe
lein duct setup
lein run

Should crash with a

Exception in thread “main” Syntax error compiling . at (ring/adapter/jetty.clj:27:9).

More info follows.

What I’ve tried

Reduced dependencies to the minimal case that gives problems
Read through How to detect and workaround dependency conflicts? at purelyfunctional.tv
Tried random :exclusions that seemed to be causing conflicts
… and discovered that random trying didn’t fix my problem.

Detailed error output

Full stack trace

Exception in thread "main" Syntax error compiling . at (ring/adapter/jetty.clj:27:9).
	at clojure.lang.Compiler.analyzeSeq(Compiler.java:7114)
	at clojure.lang.Compiler.analyze(Compiler.java:6789)
	at clojure.lang.Compiler.analyzeSeq(Compiler.java:7094)
	at clojure.lang.Compiler.analyze(Compiler.java:6789)
	at clojure.lang.Compiler.analyze(Compiler.java:6745)
	at clojure.lang.Compiler$BodyExpr$Parser.parse(Compiler.java:6120)
	at clojure.lang.Compiler$LetExpr$Parser.parse(Compiler.java:6436)
	at clojure.lang.Compiler.analyzeSeq(Compiler.java:7106)
	at clojure.lang.Compiler.analyze(Compiler.java:6789)
	at clojure.lang.Compiler.analyzeSeq(Compiler.java:7094)
	at clojure.lang.Compiler.analyze(Compiler.java:6789)
	at clojure.lang.Compiler.analyze(Compiler.java:6745)
	at clojure.lang.Compiler$BodyExpr$Parser.parse(Compiler.java:6120)
	at clojure.lang.Compiler$FnMethod.parse(Compiler.java:5467)
	at clojure.lang.Compiler$FnExpr.parse(Compiler.java:4029)
	at clojure.lang.Compiler.analyzeSeq(Compiler.java:7104)
	at clojure.lang.Compiler.analyze(Compiler.java:6789)
	at clojure.lang.Compiler.analyzeSeq(Compiler.java:7094)
	at clojure.lang.Compiler.analyze(Compiler.java:6789)
	at clojure.lang.Compiler.analyze(Compiler.java:6745)
	at clojure.lang.Compiler$MapExpr.parse(Compiler.java:3104)
	at clojure.lang.Compiler.analyze(Compiler.java:6797)
	at clojure.lang.Compiler.analyze(Compiler.java:6745)
	at clojure.lang.Compiler$InvokeExpr.parse(Compiler.java:3888)
	at clojure.lang.Compiler.analyzeSeq(Compiler.java:7108)
	at clojure.lang.Compiler.analyze(Compiler.java:6789)
	at clojure.lang.Compiler.analyze(Compiler.java:6745)
	at clojure.lang.Compiler$BodyExpr$Parser.parse(Compiler.java:6118)
	at clojure.lang.Compiler$LetExpr$Parser.parse(Compiler.java:6436)
	at clojure.lang.Compiler.analyzeSeq(Compiler.java:7106)
	at clojure.lang.Compiler.analyze(Compiler.java:6789)
	at clojure.lang.Compiler.analyzeSeq(Compiler.java:7094)
	at clojure.lang.Compiler.analyze(Compiler.java:6789)
	at clojure.lang.Compiler.analyzeSeq(Compiler.java:7094)
	at clojure.lang.Compiler.analyze(Compiler.java:6789)
	at clojure.lang.Compiler.analyze(Compiler.java:6745)
	at clojure.lang.Compiler$BodyExpr$Parser.parse(Compiler.java:6120)
	at clojure.lang.Compiler$FnMethod.parse(Compiler.java:5467)
	at clojure.lang.Compiler$FnExpr.parse(Compiler.java:4029)
	at clojure.lang.Compiler.analyzeSeq(Compiler.java:7104)
	at clojure.lang.Compiler.analyze(Compiler.java:6789)
	at clojure.lang.Compiler.analyzeSeq(Compiler.java:7094)
	at clojure.lang.Compiler.analyze(Compiler.java:6789)
	at clojure.lang.Compiler.access$300(Compiler.java:38)
	at clojure.lang.Compiler$DefExpr$Parser.parse(Compiler.java:596)
	at clojure.lang.Compiler.analyzeSeq(Compiler.java:7106)
	at clojure.lang.Compiler.analyze(Compiler.java:6789)
	at clojure.lang.Compiler.analyze(Compiler.java:6745)
	at clojure.lang.Compiler.eval(Compiler.java:7180)
	at clojure.lang.Compiler.load(Compiler.java:7635)
	at clojure.lang.RT.loadResourceScript(RT.java:381)
	at clojure.lang.RT.loadResourceScript(RT.java:372)
	at clojure.lang.RT.load(RT.java:463)
	at clojure.lang.RT.load(RT.java:428)
	at clojure.core$load$fn__6824.invoke(core.clj:6126)
	at clojure.core$load.invokeStatic(core.clj:6125)
	at clojure.core$load.doInvoke(core.clj:6109)
	at clojure.lang.RestFn.invoke(RestFn.java:408)
	at clojure.core$load_one.invokeStatic(core.clj:5908)
	at clojure.core$load_one.invoke(core.clj:5903)
	at clojure.core$load_lib$fn__6765.invoke(core.clj:5948)
	at clojure.core$load_lib.invokeStatic(core.clj:5947)
	at clojure.core$load_lib.doInvoke(core.clj:5928)
	at clojure.lang.RestFn.applyTo(RestFn.java:142)
	at clojure.core$apply.invokeStatic(core.clj:667)
	at clojure.core$load_libs.invokeStatic(core.clj:5985)
	at clojure.core$load_libs.doInvoke(core.clj:5969)
	at clojure.lang.RestFn.applyTo(RestFn.java:137)
	at clojure.core$apply.invokeStatic(core.clj:667)
	at clojure.core$require.invokeStatic(core.clj:6007)
	at clojure.core$require.doInvoke(core.clj:6007)
	at clojure.lang.RestFn.invoke(RestFn.java:436)
	at duct.server.http.jetty$eval19486$loading__6706__auto____19487.invoke(jetty.clj:1)
	at duct.server.http.jetty$eval19486.invokeStatic(jetty.clj:1)
	at duct.server.http.jetty$eval19486.invoke(jetty.clj:1)
	at clojure.lang.Compiler.eval(Compiler.java:7176)
	at clojure.lang.Compiler.eval(Compiler.java:7165)
	at clojure.lang.Compiler.load(Compiler.java:7635)
	at clojure.lang.RT.loadResourceScript(RT.java:381)
	at clojure.lang.RT.loadResourceScript(RT.java:372)
	at clojure.lang.RT.load(RT.java:463)
	at clojure.lang.RT.load(RT.java:428)
	at clojure.core$load$fn__6824.invoke(core.clj:6126)
	at clojure.core$load.invokeStatic(core.clj:6125)
	at clojure.core$load.doInvoke(core.clj:6109)
	at clojure.lang.RestFn.invoke(RestFn.java:408)
	at clojure.core$load_one.invokeStatic(core.clj:5908)
	at clojure.core$load_one.invoke(core.clj:5903)
	at clojure.core$load_lib$fn__6765.invoke(core.clj:5948)
	at clojure.core$load_lib.invokeStatic(core.clj:5947)
	at clojure.core$load_lib.doInvoke(core.clj:5928)
	at clojure.lang.RestFn.applyTo(RestFn.java:142)
	at clojure.core$apply.invokeStatic(core.clj:667)
	at clojure.core$load_libs.invokeStatic(core.clj:5985)
	at clojure.core$load_libs.doInvoke(core.clj:5969)
	at clojure.lang.RestFn.applyTo(RestFn.java:137)
	at clojure.core$apply.invokeStatic(core.clj:667)
	at clojure.core$require.invokeStatic(core.clj:6007)
	at clojure.core$require.doInvoke(core.clj:6007)
	at clojure.lang.RestFn.invoke(RestFn.java:408)
	at integrant.core$try_require.invokeStatic(core.cljc:171)
	at integrant.core$try_require.invoke(core.cljc:170)
	at clojure.core$keep$fn__8544.invoke(core.clj:7341)
	at clojure.lang.LazySeq.sval(LazySeq.java:42)
	at clojure.lang.LazySeq.seq(LazySeq.java:58)
	at clojure.lang.Cons.next(Cons.java:39)
	at clojure.lang.RT.next(RT.java:709)
	at clojure.core$next__5371.invokeStatic(core.clj:64)
	at clojure.core$dorun.invokeStatic(core.clj:3142)
	at clojure.core$doall.invokeStatic(core.clj:3148)
	at clojure.core$doall.invoke(core.clj:3148)
	at integrant.core$load_namespaces.invokeStatic(core.cljc:184)
	at integrant.core$load_namespaces.invoke(core.cljc:175)
	at integrant.core$load_namespaces.invokeStatic(core.cljc:182)
	at integrant.core$load_namespaces.invoke(core.cljc:175)
	at duct.core$prep_config.invokeStatic(core.clj:194)
	at duct.core$prep_config.invoke(core.clj:184)
	at duct.core$exec_config.invokeStatic(core.clj:225)
	at duct.core$exec_config.invoke(core.clj:213)
	at dep_mwe.main$_main.invokeStatic(main.clj:12)
	at dep_mwe.main$_main.doInvoke(main.clj:7)
	at clojure.lang.RestFn.invoke(RestFn.java:408)
	at clojure.lang.Var.invoke(Var.java:384)
	at user$eval151.invokeStatic(form-init5669067227873710595.clj:1)
	at user$eval151.invoke(form-init5669067227873710595.clj:1)
	at clojure.lang.Compiler.eval(Compiler.java:7176)
	at clojure.lang.Compiler.eval(Compiler.java:7166)
	at clojure.lang.Compiler.load(Compiler.java:7635)
	at clojure.lang.Compiler.loadFile(Compiler.java:7573)
	at clojure.main$load_script.invokeStatic(main.clj:452)
	at clojure.main$init_opt.invokeStatic(main.clj:454)
	at clojure.main$init_opt.invoke(main.clj:454)
	at clojure.main$initialize.invokeStatic(main.clj:485)
	at clojure.main$null_opt.invokeStatic(main.clj:519)
	at clojure.main$null_opt.invoke(main.clj:516)
	at clojure.main$main.invokeStatic(main.clj:598)
	at clojure.main$main.doInvoke(main.clj:561)
	at clojure.lang.RestFn.applyTo(RestFn.java:137)
	at clojure.lang.Var.applyTo(Var.java:705)
	at clojure.main.main(main.java:37)
Caused by: java.lang.NoClassDefFoundError: org/eclipse/jetty/http/HttpParser$ProxyHandler
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at java.lang.Class.getDeclaredMethods0(Native Method)
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
	at java.lang.Class.privateGetPublicMethods(Class.java:2902)
	at java.lang.Class.getMethods(Class.java:1615)
	at clojure.lang.Reflector.getMethods(Reflector.java:498)
	at clojure.lang.Compiler$InstanceMethodExpr.<init>(Compiler.java:1488)
	at clojure.lang.Compiler$HostExpr$Parser.parse(Compiler.java:1024)
	at clojure.lang.Compiler.analyzeSeq(Compiler.java:7106)
	... 139 more
Caused by: java.lang.ClassNotFoundException: org.eclipse.jetty.http.HttpParser$ProxyHandler
	at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 159 more
lein run  12,41s user 0,44s system 123% cpu 10,410 total

lein deps :tree output

Possibly confusing dependencies found:
[kerodon "0.9.0"] -> [ring/ring-codec "1.0.1"]
 overrides
[duct/module.web "0.7.0"] -> [ring/ring-devel "1.7.1"] -> [ring/ring-core "1.7.1"] -> [ring/ring-codec "1.1.1"]
 and
[duct/module.web "0.7.0"] -> [ring/ring-core "1.7.1"] -> [ring/ring-codec "1.1.1"]
 and
[duct/module.web "0.7.0"] -> [compojure "1.6.1"] -> [ring/ring-codec "1.1.0"]

Consider using these exclusions:
[duct/module.web "0.7.0" :exclusions [ring/ring-codec]]

[kerodon "0.9.0"] -> [ring/ring-codec "1.0.1"] -> [commons-codec "1.6"]
 overrides
[com.datomic/client-pro "0.8.28"] -> [com.datomic/client "0.8.69"] -> [com.datomic/client-impl-shared "0.8.49"] -> [com.cognitect/transit-clj "0.8.313"] -> [com.cognitect/transit-java "0.8.337"] -> [commons-codec "1.10"]
 and
[kerodon "0.9.0"] -> [peridot "0.5.0"] -> [org.apache.httpcomponents/httpmime "4.5.1" :exclusions [commons-logging]] -> [org.apache.httpcomponents/httpclient "4.5.1"] -> [commons-codec "1.9"]
 and
[com.datomic/client-pro "0.8.28"] -> [com.datomic/client-impl-shared "0.8.49"] -> [com.cognitect/transit-clj "0.8.313"] -> [com.cognitect/transit-java "0.8.337"] -> [commons-codec "1.10"]
 and
[com.datomic/client-pro "0.8.28"] -> [com.datomic/client "0.8.69"] -> [com.datomic/client-impl-shared "0.8.49"] -> [com.cognitect/hmac-authn "0.1.194"] -> [commons-codec "1.10"]
 and
[duct/module.web "0.7.0"] -> [ring/ring-devel "1.7.1"] -> [ring/ring-core "1.7.1"] -> [ring/ring-codec "1.1.1"] -> [commons-codec "1.11"]
 and
[duct/module.web "0.7.0"] -> [metosin/muuntaja "0.6.3"] -> [com.cognitect/transit-clj "0.8.313"] -> [com.cognitect/transit-java "0.8.337"] -> [commons-codec "1.10"]
 and
[com.datomic/client-pro "0.8.28"] -> [com.datomic/client-impl-shared "0.8.49"] -> [com.cognitect/hmac-authn "0.1.194"] -> [commons-codec "1.10"]
 and
[duct/module.web "0.7.0"] -> [ring/ring-core "1.7.1"] -> [ring/ring-codec "1.1.1"] -> [commons-codec "1.11"]
 and
[duct/module.web "0.7.0"] -> [compojure "1.6.1"] -> [ring/ring-codec "1.1.0"] -> [commons-codec "1.10"]

Consider using these exclusions:
[com.datomic/client-pro "0.8.28" :exclusions [commons-codec]]
[kerodon "0.9.0" :exclusions [commons-codec]]
[duct/module.web "0.7.0" :exclusions [commons-codec]]

[duct/module.web "0.7.0"] -> [duct/server.http.jetty "0.2.0"] -> [ring/ring-jetty-adapter "1.6.2"] -> [org.eclipse.jetty/jetty-server "9.2.21.v20170120"] -> [org.eclipse.jetty/jetty-io "9.2.21.v20170120"]
 overrides
[com.datomic/client-pro "0.8.28"] -> [com.datomic/client "0.8.69"] -> [com.datomic/client-impl-shared "0.8.49"] -> [com.cognitect/http-client "0.1.87"] -> [org.eclipse.jetty/jetty-client "9.3.7.v20160115"] -> [org.eclipse.jetty/jetty-io "9.3.7.v20160115"]
 and
[com.datomic/client-pro "0.8.28"] -> [com.datomic/client-impl-shared "0.8.49"] -> [com.cognitect/http-client "0.1.87"] -> [org.eclipse.jetty/jetty-client "9.3.7.v20160115"] -> [org.eclipse.jetty/jetty-io "9.3.7.v20160115"]
 and
[com.datomic/client-pro "0.8.28"] -> [com.datomic/client "0.8.69"] -> [com.cognitect/http-client "0.1.87"] -> [org.eclipse.jetty/jetty-client "9.3.7.v20160115"] -> [org.eclipse.jetty/jetty-io "9.3.7.v20160115"]

Consider using these exclusions:
[com.datomic/client-pro "0.8.28" :exclusions [org.eclipse.jetty/jetty-io]]

 [clojure-complete "0.2.5" :exclusions [[org.clojure/clojure]]]
 [com.datomic/client-pro "0.8.28"]
   [com.cognitect/anomalies "0.1.12"]
   [com.datomic/client-impl-shared "0.8.49"]
     [com.cognitect/hmac-authn "0.1.194"]
   [com.datomic/client "0.8.69"]
     [com.cognitect/http-client "0.1.87"]
       [org.eclipse.jetty/jetty-client "9.3.7.v20160115"]
       [org.eclipse.jetty/jetty-http "9.3.7.v20160115"]
       [org.eclipse.jetty/jetty-util "9.3.7.v20160115"]
     [com.datomic/client-api "0.8.13"]
   [org.clojure/core.async "0.3.442"]
     [org.clojure/tools.analyzer.jvm "0.7.0"]
       [org.clojure/core.memoize "0.5.9"]
         [org.clojure/core.cache "0.6.5"]
           [org.clojure/data.priority-map "0.0.7"]
       [org.clojure/tools.analyzer "0.6.9"]
       [org.clojure/tools.reader "1.0.0-beta4"]
       [org.ow2.asm/asm-all "4.2"]
 [duct/core "0.7.0"]
   [fipp "0.6.14"]
     [org.clojure/core.rrb-vector "0.0.13"]
   [integrant "0.7.0"]
     [weavejester/dependency "0.2.1"]
   [medley "1.0.0"]
 [duct/module.logging "0.4.0"]
   [duct/logger.timbre "0.4.1"]
     [com.taoensso/timbre "4.10.0"]
       [com.taoensso/encore "2.91.0"]
         [com.taoensso/truss "1.5.0"]
   [duct/logger "0.3.0"]
 [duct/module.web "0.7.0"]
   [compojure "1.6.1"]
     [clout "2.2.1"]
       [instaparse "1.4.8" :exclusions [[org.clojure/clojure]]]
     [org.clojure/tools.macro "0.1.5"]
   [duct/server.http.jetty "0.2.0"]
     [ring/ring-jetty-adapter "1.6.2"]
       [org.eclipse.jetty/jetty-server "9.2.21.v20170120"]
         [org.eclipse.jetty/jetty-io "9.2.21.v20170120"]
       [ring/ring-servlet "1.6.2"]
   [metosin/muuntaja "0.6.3"]
     [com.cognitect/transit-clj "0.8.313"]
       [com.cognitect/transit-java "0.8.337"]
         [javax.xml.bind/jaxb-api "2.3.0"]
         [org.msgpack/msgpack "0.6.12"]
           [com.googlecode.json-simple/json-simple "1.1.1" :exclusions [[junit]]]
           [org.javassist/javassist "3.18.1-GA"]
     [metosin/jsonista "0.2.2"]
       [com.fasterxml.jackson.core/jackson-databind "2.9.7"]
         [com.fasterxml.jackson.core/jackson-annotations "2.9.0"]
         [com.fasterxml.jackson.core/jackson-core "2.9.7"]
       [com.fasterxml.jackson.datatype/jackson-datatype-jsr310 "2.9.7"]
       [org.ow2.asm/asm "5.1"]
       [virgil "0.1.6"]
   [org.slf4j/slf4j-nop "1.7.25"]
     [org.slf4j/slf4j-api "1.7.25"]
   [org.webjars/normalize.css "5.0.0"]
   [ring-webjars "0.2.0"]
     [org.webjars/webjars-locator "0.27"]
       [org.apache.commons/commons-lang3 "3.4"]
       [org.webjars/webjars-locator-core "0.27"]
         [org.apache.commons/commons-compress "1.9"]
   [ring/ring-core "1.7.1"]
     [clj-time "0.14.3"]
       [joda-time "2.9.9"]
     [commons-fileupload "1.3.3"]
     [commons-io "2.6"]
     [crypto-equality "1.0.0"]
     [crypto-random "1.2.0"]
   [ring/ring-defaults "0.3.2"]
     [javax.servlet/javax.servlet-api "3.1.0"]
     [ring/ring-anti-forgery "1.3.0"]
     [ring/ring-headers "0.3.0"]
     [ring/ring-ssl "0.3.0"]
   [ring/ring-devel "1.7.1"]
     [clj-stacktrace "0.2.8"]
     [hiccup "1.0.5"]
     [ns-tracker "0.3.1"]
       [org.clojure/java.classpath "0.2.3"]
 [eftest "0.5.7"]
   [io.aviso/pretty "0.1.34"]
   [mvxcvi/puget "1.0.3"]
     [mvxcvi/arrangement "1.1.1"]
   [progrock "0.1.2"]
 [integrant/repl "0.3.1"]
   [org.clojure/tools.namespace "0.2.11"]
 [kerodon "0.9.0"]
   [enlive "1.1.6" :exclusions [[org.clojure/clojure]]]
     [org.ccil.cowan.tagsoup/tagsoup "1.2.1"]
     [org.jsoup/jsoup "1.7.2"]
   [org.flatland/ordered "1.5.4"]
     [org.flatland/useful "0.9.0"]
   [peridot "0.5.0"]
     [org.apache.httpcomponents/httpcore "4.4.5"]
     [org.apache.httpcomponents/httpmime "4.5.1" :exclusions [[commons-logging]]]
       [org.apache.httpcomponents/httpclient "4.5.1"]
     [org.clojure/data.codec "0.1.0"]
     [ring-mock "0.1.5"]
   [ring/ring-codec "1.0.1"]
     [commons-codec "1.6"]
 [nrepl "0.6.0" :exclusions [[org.clojure/clojure]]]
 [org.clojure/clojure "1.10.0"]
   [org.clojure/core.specs.alpha "0.2.44"]
   [org.clojure/spec.alpha "0.2.176"]

I’d love some input!

Specifically, how can I unbreak my small example?
Generally, recommendations for working with dependency conflicts in Clojure?

Thanks!

Teodor

teodorlu · May 6, 2019, 11:30am

Small update:

Putting in all the recommended :exclusions from lein deps :tree didn’t help
There’s a related discussion on Jetty dependency conflicts on the Datomic Forum:

teodorlu · May 6, 2019, 12:22pm

Bigger update!

Rubber duck debugging really helps, guys.

I noticed that multiple org.eclipse.jetty/ packages were named according to the same scheme, for example "9.2.21.v20170120"
Duct required [org.eclipse.jetty/jetty-server "9.2.21.v20170120"], and Datomic required [org.eclipse.jetty/jetty-client "9.3.7.v20160115"]
Together that broke!

Checking my original dependency tree, this lead to (excerpt from lein deps :tree):

;; ... lots of deps ...
;; Datomic deps
   [com.datomic/client "0.8.69"]
     [com.cognitect/http-client "0.1.87"]
       [org.eclipse.jetty/jetty-client "9.3.7.v20160115"]
       [org.eclipse.jetty/jetty-http "9.3.7.v20160115"]
       [org.eclipse.jetty/jetty-util "9.3.7.v20160115"]
     [com.datomic/client-api "0.8.13"]
;; ... lots of more deps ...
;; Duct deps
   [duct/server.http.jetty "0.2.0"]
     [ring/ring-jetty-adapter "1.6.2"]
       [org.eclipse.jetty/jetty-server "9.2.21.v20170120"]
         [org.eclipse.jetty/jetty-io "9.2.21.v20170120"]

… where org.eclipse.jetty/jetty-server depended on jetty-util. However, jetty-util was provided as a dependency of com.cognitect/http-client! Which munched together different Jetty versions.

I decided that I should probably stick to one version. Things magically started working when I manually set ring versions:

;; I added this to :dependencies in project.clj
                 [ring "1.7.1"]
                 [ring/ring-core "1.7.1"]
                 [ring/ring-devel "1.7.1"]
                 [ring/ring-jetty-adapter "1.7.1"]
                 [ring/ring-servlet "1.7.1"]

Fixing Jetty versions instead of Ring versions also worked.

;; alternatively, setting these dependencies also worked:
                 [org.eclipse.jetty/jetty-server "9.4.12.v20180830"]
                 [org.eclipse.jetty/jetty-http "9.4.12.v20180830"]
                 [org.eclipse.jetty/jetty-util "9.4.12.v20180830"]
                 [org.eclipse.jetty/jetty-io "9.4.12.v20180830"]

Lessons learned

Working with dependency conflicts isn’t black magic
Problems arise when two libraries that you depend on both require the same library of different versions
Leiningen is going to pick the “most specific” version. If you depend directly on a library, that library is picked. If you depend on a lib that depends on a lib that depends on a lib …, that recursive dependency might be deprioritized.
Some libraries are split into separate packages, but should be kept together. Use one Ring version. Use one Jetty version.
lein deps :tree tells you dependency conflicts in the beginning. Afterwards, you’ll see the resolved versions of all the libraries you’re using. Use this to your advantage! See what libraries are getting a version they’re not expecting. If the library in conflict is developed in a backwards-compatible way, you should be able to use the latest version.
As an application author you’re responsible for resolving upstream dependency conflicts.

/monologue done. Hope this might help someone else in the same pit of trouble!

Teodor

system · November 5, 2019, 12:23am

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