scalate cannot compile template when part of executable jar

[kgignatyev]

Here is project that reproduces the issue
https://github.com/kgignatyev/scalate-test

Traditional app works

creating assembly
mvn clean  install appassembler:assemble
trying it
bash target/appassembler/bin/ctrl

but when the same application is packaged by spring-boot into a single executable jar, ssp compiler does NOT work

Packaging all the jars into executable jar
mvn -f pom-executable-jar.xml clean install

Trying it
java -jar target/scalate-test-1.0-SNAPSHOT.jar 

I see this error:
Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:50)
at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:51)
Caused by: org.fusesource.scalate.TemplateException: object scala in compiler mirror not found.
at org.fusesource.scalate.TemplateEngine.compileAndLoad(TemplateEngine.scala:886)
at org.fusesource.scalate.TemplateEngine.compileAndLoadEntry(TemplateEngine.scala:745)
at org.fusesource.scalate.TemplateEngine.liftedTree1$1(TemplateEngine.scala:446)
at org.fusesource.scalate.TemplateEngine.load(TemplateEngine.scala:440)
at org.fusesource.scalate.TemplateEngine.load(TemplateEngine.scala:495)
at org.fusesource.scalate.TemplateEngine.layout(TemplateEngine.scala:593)
at com.inspurusa.consul.apigateway.integration.NginxController.createNginxConfig(NginxController.scala:33)
at com.inspurusa.consul.apigateway.integration.NginxController.generateConfigFile(NginxController.scala:46)
at com.inspurusa.consul.apigateway.integration.ServicesControl$.delayedEndpoint$com$inspurusa$consul$apigateway$integration$ServicesControl$1(ServicesControl.scala:58)
at com.inspurusa.consul.apigateway.integration.ServicesControl$delayedInit$body.apply(ServicesControl.scala:41)
at scala.Function0.apply$mcV$sp(Function0.scala:34)
at scala.Function0.apply$mcV$sp$(Function0.scala:34)
at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
at scala.App.$anonfun$main$1$adapted(App.scala:76)
at scala.collection.immutable.List.foreach(List.scala:389)
at scala.App.main(App.scala:76)
at scala.App.main$(App.scala:74)
at com.inspurusa.consul.apigateway.integration.ServicesControl$.main(ServicesControl.scala:41)
at com.inspurusa.consul.apigateway.integration.ServicesControl.main(ServicesControl.scala)
... 8 more
Caused by: scala.reflect.internal.MissingRequirementError: object scala in compiler mirror not found.
at scala.reflect.internal.MissingRequirementError$.signal(MissingRequirementError.scala:17)
at scala.reflect.internal.MissingRequirementError$.notFound(MissingRequirementError.scala:18)
at scala.reflect.internal.Mirrors$RootsBase.$anonfun$getModuleOrClass$4(Mirrors.scala:54)
at scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:54)
at scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:66)
at scala.reflect.internal.Mirrors$RootsBase.getPackage(Mirrors.scala:172)
at scala.reflect.internal.Definitions$DefinitionsClass.ScalaPackage$lzycompute(Definitions.scala:169)
at scala.reflect.internal.Definitions$DefinitionsClass.ScalaPackage(Definitions.scala:169)
at scala.reflect.internal.Definitions$DefinitionsClass.ScalaPackageClass$lzycompute(Definitions.scala:170)
at scala.reflect.internal.Definitions$DefinitionsClass.ScalaPackageClass(Definitions.scala:170)
at scala.reflect.internal.Definitions$DefinitionsClass.init(Definitions.scala:1449)
at scala.tools.nsc.Global$Run.(Global.scala:1154)
at org.fusesource.scalate.support.ScalaCompiler.compile(ScalaCompiler.scala:92)
at org.fusesource.scalate.TemplateEngine.compileAndLoad(TemplateEngine.scala:809)
... 26 more

[roland-ewald]

The same error message appears when running code with the IntelliJ classpath option JAR manifest enabled (but it works with any other option).

[onema]

Any updates on this?

[LeonardMeyer]

Had a similar error with Scala 2.12.8 (Object not found), and using the 1.9.1-RC1 fixed it

[rafalmag]

I have the same issue with Scala 2.13.10 and Scalate 1.9.8, JDK 11.0.12.
I wonder if the problem is related to classpath. Some good summary or related materials at https://stackoverflow.com/a/75651072/252363 TL;DR - maybe related to flags: "--release 8" and "-javabootclasspath" or "settings.usejavacp.value = true"