dotty.tools.xsbt.PositionBridge@3eec221b: could not find Lazy implicit value error when trying to upgrade the scala version to 3.0.0

[rajcspsg]

Hi,

I'm sample maven scala project here
When compiling the project with scala-maven-version 4.5.1 I get the below error.

[ERROR] dotty.tools.xsbt.PositionBridge@767bb276: could not find Lazy implicit value of type scodec.Codec[adserver.cluster.serializer.TagRequest].
I found:

shapeless.Lazy.mkLazy[I]

But method mkLazy in object Lazy does not match type shapeless.Lazy[scodec.Codec[adserver.cluster.serializer.TagRequest]].

One of the following imports might make progress towards fixing the problem:

import shapeless.?>.idKeyWitness
import shapeless.?>.idValueWitness
import shapeless.~?>.witness

I added the below code from the error suggestion above.

import shapeless.~?>.idKeyWitness
import shapeless.~?>.idValueWitness
import shapeless.~?>.witness

After adding that I got below error.

[ERROR] dotty.tools.xsbt.PositionBridge@39640f7b: could not find Lazy implicit value of type scodec.Codec[adserver.cluster.serializer.Event].
I found:

shapeless.?>.witness[Nothing, Nothing, T](shapeless.?>.rel[Nothing, Nothing])

What is the error. How can I fix this for scala 3?

[davidB]

Sorry I didn't play enough with scala3 / dotty to help you.

Maybe try to contact the shapeless or scala3 community for help. And please reopen the ticket with more info if it is a issue with the plugin (In this case providing a minimal sample project case to reproduce the issue will help a lot like your linked project https://github.com/rajcspsg/scala3-maven-build-demo).

Thanks

[mims-github]

@davidB
May I "miss"-use this issue to check, if the following is a problem in this plugin or a (configuration?) problem for the Scala3 compiler?

When a compile error is logged by the plugin, one has no way to find out, in which source file the problem actually is. Which makes fixing it quite hard. 😅
I guess that the dotty.tools.xsbt.PositionBridge@767bb276: part in the log line should show the location of the problem, but it looks like the Object.toString is used instead a helpful custom toString impl.
https://github.com/lampepfl/dotty/blob/master/sbt-bridge/src/dotty/tools/xsbt/PositionBridge.java

Can you confirm?
Let me know how I can help.

Thanks a lot for the plugin!

I was now able to debug it, and from looking at the stack, it looks like it's a problem in dotty/sbt, and not in scala-maven-plugin:

log:45, SbtLogger (sbt_inc)
log:47, Logger (sbt.util)
warn:43, Logger (sbt.util)
logWarning:159, LoggedReporter (sbt.internal.inc)
display:168, LoggedReporter (sbt.internal.inc)
log:142, LoggedReporter (sbt.internal.inc)
doReport:43, DelegatingReporter (dotty.tools.xsbt)
report:150, Reporter (dotty.tools.dotc.reporting)
issueWarning:32, report$ (dotty.tools.dotc)
warning:67, report$ (dotty.tools.dotc)
checkExhaustivity:847, SpaceEngine (dotty.tools.dotc.transform.patmat)
transformMatch:45, PatternMatcher (dotty.tools.dotc.transform)
goMatch:779, MegaPhase (dotty.tools.dotc.transform)
transformUnnamed$1:369, MegaPhase (dotty.tools.dotc.transform)
transformTree:429, MegaPhase (dotty.tools.dotc.transform)
mapDefDef$1:249, MegaPhase (dotty.tools.dotc.transform)
transformNamed$1:252, MegaPhase (dotty.tools.dotc.transform)
transformTree:427, MegaPhase (dotty.tools.dotc.transform)
transformStat$2:437, MegaPhase (dotty.tools.dotc.transform)
recur$3$$anonfun$1:442, MegaPhase (dotty.tools.dotc.transform)
apply:-1, 1211614573 (dotty.tools.dotc.transform.MegaPhase$$Lambda$1731)
mapConserve:472, List (scala.collection.immutable)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
transformStats:442, MegaPhase (dotty.tools.dotc.transform)
transformUnnamed$1:362, MegaPhase (dotty.tools.dotc.transform)
transformTree:429, MegaPhase (dotty.tools.dotc.transform)
transformNamed$1:256, MegaPhase (dotty.tools.dotc.transform)
transformTree:427, MegaPhase (dotty.tools.dotc.transform)
transformStat$2:437, MegaPhase (dotty.tools.dotc.transform)
recur$3$$anonfun$1:442, MegaPhase (dotty.tools.dotc.transform)
apply:-1, 1211614573 (dotty.tools.dotc.transform.MegaPhase$$Lambda$1731)
mapConserve:472, List (scala.collection.immutable)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
recur$1:442, MegaPhase (dotty.tools.dotc.transform)
transformStats:442, MegaPhase (dotty.tools.dotc.transform)
mapPackage$1:382, MegaPhase (dotty.tools.dotc.transform)
transformUnnamed$1:385, MegaPhase (dotty.tools.dotc.transform)
transformTree:429, MegaPhase (dotty.tools.dotc.transform)
transformUnit:448, MegaPhase (dotty.tools.dotc.transform)
run:460, MegaPhase (dotty.tools.dotc.transform)
runOn$$anonfun$1:303, Phases$Phase (dotty.tools.dotc.core)
apply:-1, 381605910 (dotty.tools.dotc.core.Phases$Phase$$Lambda$1464)
map:246, List (scala.collection.immutable)
runOn:304, Phases$Phase (dotty.tools.dotc.core)
runPhases$4$$anonfun$4:205, Run (dotty.tools.dotc)
applyVoid:-1, 97755704 (dotty.tools.dotc.Run$$Lambda$852)
apply:15, JProcedure1 (scala.runtime.function)
apply:10, JProcedure1 (scala.runtime.function)
foreach$extension:1323, ArrayOps$ (scala.collection)
runPhases$5:215, Run (dotty.tools.dotc)
compileUnits$$anonfun$1:223, Run (dotty.tools.dotc)
apply$mcV$sp:-1, 1489854600 (dotty.tools.dotc.Run$$Lambda$815)
apply:18, JFunction0$mcV$sp (scala.runtime.java8)
maybeMonitored:67, Stats$ (dotty.tools.dotc.util)
compileUnits:230, Run (dotty.tools.dotc)
compileSources:166, Run (dotty.tools.dotc)
compile:150, Run (dotty.tools.dotc)
doCompile:39, Driver (dotty.tools.dotc)
run:88, CompilerBridgeDriver (dotty.tools.xsbt)
run:22, CompilerBridge (dotty.tools.xsbt)
compile:91, AnalyzingCompiler (sbt.internal.inc)
$anonfun$compile$7:186, MixedAnalyzingCompiler (sbt.internal.inc)
apply$mcV$sp:-1, 1081132287 (sbt.internal.inc.MixedAnalyzingCompiler$$Lambda$548)
apply:18, JFunction0$mcV$sp (scala.runtime.java8)
timed:241, MixedAnalyzingCompiler (sbt.internal.inc)
$anonfun$compile$4:176, MixedAnalyzingCompiler (sbt.internal.inc)
$anonfun$compile$4$adapted:157, MixedAnalyzingCompiler (sbt.internal.inc)
apply:-1, 208157941 (sbt.internal.inc.MixedAnalyzingCompiler$$Lambda$544)
withPreviousJar:239, JarUtils$ (sbt.internal.inc)
compileScala$1:157, MixedAnalyzingCompiler (sbt.internal.inc)
compile:204, MixedAnalyzingCompiler (sbt.internal.inc)
$anonfun$compileInternal$1:528, IncrementalCompilerImpl (sbt.internal.inc)
$anonfun$compileInternal$1$adapted:528, IncrementalCompilerImpl (sbt.internal.inc)
apply:-1, 1055294327 (sbt.internal.inc.IncrementalCompilerImpl$$Lambda$254)
$anonfun$apply$5:174, Incremental$ (sbt.internal.inc)
$anonfun$apply$5$adapted:172, Incremental$ (sbt.internal.inc)
apply:-1, 2067939216 (sbt.internal.inc.Incremental$$$Lambda$261)
run:457, Incremental$$anon$2 (sbt.internal.inc)
next:116, IncrementalCommon$CycleState (sbt.internal.inc)
next:56, IncrementalCommon$$anon$1 (sbt.internal.inc)
next:52, IncrementalCommon$$anon$1 (sbt.internal.inc)
cycle:261, IncrementalCommon (sbt.internal.inc)
$anonfun$incrementalCompile$8:412, Incremental$ (sbt.internal.inc)
apply:-1, 1464984894 (sbt.internal.inc.Incremental$$$Lambda$459)
withClassfileManager:499, Incremental$ (sbt.internal.inc)
incrementalCompile:399, Incremental$ (sbt.internal.inc)
apply:166, Incremental$ (sbt.internal.inc)
compileInternal:528, IncrementalCompilerImpl (sbt.internal.inc)
$anonfun$compileIncrementally$1:482, IncrementalCompilerImpl (sbt.internal.inc)
apply:-1, 193208949 (sbt.internal.inc.IncrementalCompilerImpl$$Lambda$157)
handleCompilationError:332, IncrementalCompilerImpl (sbt.internal.inc)
compileIncrementally:420, IncrementalCompilerImpl (sbt.internal.inc)
compile:137, IncrementalCompilerImpl (sbt.internal.inc)
compile:179, SbtIncrementalCompiler (sbt_inc)
incrementalCompile:356, ScalaCompilerSupport (scala_maven)
compile:113, ScalaCompilerSupport (scala_maven)
doExecute:88, ScalaCompilerSupport (scala_maven)
execute:308, ScalaMojoSupport (scala_maven)
executeMojo:137, DefaultBuildPluginManager (org.apache.maven.plugin)
execute:208, MojoExecutor (org.apache.maven.lifecycle.internal)
execute:154, MojoExecutor (org.apache.maven.lifecycle.internal)
execute:146, MojoExecutor (org.apache.maven.lifecycle.internal)
buildProject:117, LifecycleModuleBuilder (org.apache.maven.lifecycle.internal)
buildProject:81, LifecycleModuleBuilder (org.apache.maven.lifecycle.internal)
build:56, SingleThreadedBuilder (org.apache.maven.lifecycle.internal.builder.singlethreaded)
execute:128, LifecycleStarter (org.apache.maven.lifecycle.internal)
doExecute:305, DefaultMaven (org.apache.maven)
doExecute:192, DefaultMaven (org.apache.maven)
execute:105, DefaultMaven (org.apache.maven)
execute:954, MavenCli (org.apache.maven.cli)
doMain:288, MavenCli (org.apache.maven.cli)
main:192, MavenCli (org.apache.maven.cli)
invoke0:-1, NativeMethodAccessorImpl (jdk.internal.reflect)
invoke:62, NativeMethodAccessorImpl (jdk.internal.reflect)
invoke:43, DelegatingMethodAccessorImpl (jdk.internal.reflect)
invoke:566, Method (java.lang.reflect)
launchEnhanced:289, Launcher (org.codehaus.plexus.classworlds.launcher)
launch:229, Launcher (org.codehaus.plexus.classworlds.launcher)
mainWithExitCode:415, Launcher (org.codehaus.plexus.classworlds.launcher)
main:356, Launcher (org.codehaus.plexus.classworlds.launcher)

[davidB]

@mims-github , yes using another issue was maybe a better place. Anyways any suggestions to improve the dev experience and help to resolve this issue directly or indirectly is welcomed (IMHO).

In this case, I also though that the improvement is on dotty or sbt-bridge side, if I'm wrong PR are welcomes, TBH I didn't did a lot in this issue (expected try to reproduce and check some configuration), and I'm no longer a scala user or dev (since several years now), so not the best to fix or to help on this (double) issue

[mims-github]

@davidB Thanks a lot for your quick feedback, very appreciated.
I will check with upstream projects, if we can improve from their side.

[mims-github]

FYI: Starting with nightly version 3.0.2-RC1-bin-20210611-fcd837a-NIGHTLY, a more informative source location info is logged for compile errors and warnings.