java.lang.NoClassDefFoundError when using jwt-circe with http4s

I’m running into the below exception when trying to use jwt-circe v3.1.0 with http4s v0.20.10. This appears be due to the libraries depending on different versions of Circe 0.12.0-M3 vs. 0.11.1. The code works if I downgrade to jwt-circev3.0 which uses the same Circe version as http4s.

Is there a specific reason for using the 0.12 milestone build? Could Circe version be downgraded to the latest release version?

java.lang.NoClassDefFoundError: io/circe/jawn/CirceSupportParser$
	at org.http4s.circe.CirceInstances.$anonfun$jsonDecoderAdaptive$1(CirceInstances.scala:60)
	at org.http4s.EntityDecoder$$anon$7.decode(EntityDecoder.scala:176)
	at org.http4s.EntityDecoder$$anon$2.decode(EntityDecoder.scala:43)
	at org.http4s.client.DefaultClient.$anonfun$expectOr$2(DefaultClient.scala:99)
	at cats.effect.Resource.$anonfun$use$1(Resource.scala:120)
	at cats.effect.internals.IOBracket$BracketStart.liftedTree1$1(IOBracket.scala:79)
	at cats.effect.internals.IOBracket$BracketStart.run(IOBracket.scala:79)
	at cats.effect.internals.Trampoline.cats$effect$internals$Trampoline$$immediateLoop(Trampoline.scala:70)
	at cats.effect.internals.Trampoline.startLoop(Trampoline.scala:36)
	at cats.effect.internals.TrampolineEC$JVMTrampoline.super$startLoop(TrampolineEC.scala:93)
	at cats.effect.internals.TrampolineEC$JVMTrampoline.$anonfun$startLoop$1(TrampolineEC.scala:93)
	at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
	at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:85)
	at cats.effect.internals.TrampolineEC$JVMTrampoline.startLoop(TrampolineEC.scala:93)
	at cats.effect.internals.Trampoline.execute(Trampoline.scala:43)
	at cats.effect.internals.TrampolineEC.execute(TrampolineEC.scala:44)
	at cats.effect.internals.Callback$AsyncIdempotentCallback.apply(Callback.scala:133)
	at cats.effect.internals.Callback$AsyncIdempotentCallback.apply(Callback.scala:120)
	at org.http4s.client.blaze.Http1Connection.parsePrelude(Http1Connection.scala:296)
	at org.http4s.client.blaze.Http1Connection.$anonfun$readAndParsePrelude$1(Http1Connection.scala:189)
	at org.http4s.client.blaze.Http1Connection.$anonfun$readAndParsePrelude$1$adapted(Http1Connection.scala:188)
	at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:64)
	at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1426)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)
Caused by: java.lang.ClassNotFoundException: io.circe.jawn.CirceSupportParser$
	at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:471)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:588)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
	... 28 more

[marko-asplund]

Just tested the new release and it seems to be working, closing this issue. Big thanks @pauldijou! 🥇

[travisbrown]

The problem is that there’s no Cats 1.x release for 2.13 (and won’t be, because of ScalaCheck), and no non-milestone, non-RC Cats 2.0 yet, and in any case I wouldn’t want to bump from Cats 1 to Cats 2 in a patch version update.