java.util.regex.PatternSyntaxException when generating a project using a template that used to work

[magneticflux-]

steps

Giter8 version: 0.12.0
Java version: 1.8.0_221

problem

The format might have changed slightly and invalidated something I was using before. I can't tell where I need to adjust it though because the error message doesn't specify the file being used.

stack trace

[info] resolving Giter8 0.12.0...
log4j:ERROR A "org.apache.log4j.ConsoleAppender" object is not assignable to a "org.apache.log4j.Appender" variable.
log4j:ERROR The class "org.apache.log4j.Appender" was loaded by
log4j:ERROR [java.net.URLClassLoader@56afaa] whereas object of type
log4j:ERROR "org.apache.log4j.ConsoleAppender" was loaded by [java.net.URLClassLoader@14c265e].
log4j:ERROR Could not instantiate appender named "stderr".
java.util.regex.PatternSyntaxException: Unexpected internal error near index 1
\
        at java.util.regex.Pattern.error(Unknown Source)
        at java.util.regex.Pattern.compile(Unknown Source)
        at java.util.regex.Pattern.<init>(Unknown Source)
        at java.util.regex.Pattern.compile(Unknown Source)
        at java.lang.String.split(Unknown Source)
        at java.lang.String.split(Unknown Source)
        at giter8.G8$.expandPath(g8.scala:212)
        at giter8.G8$.$anonfun$writeTemplates$1(g8.scala:488)
        at scala.collection.immutable.Stream.map(Stream.scala:418)
        at giter8.G8$.writeTemplates(g8.scala:486)
        at giter8.G8$.$anonfun$applyT$1(g8.scala:347)
        at scala.util.Either$RightProjection.flatMap(Either.scala:701)
        at giter8.G8$.applyT(g8.scala:330)
        at giter8.G8$.fromDirectory(g8.scala:76)
        at giter8.G8TemplateRenderer$.render(TemplateRenderer.scala:40)
        at giter8.AppProcessor.process(giter8.scala:58)
        at giter8.Runner.$anonfun$run$9(Runner.scala:54)
        at scala.util.Either.flatMap(Either.scala:341)
        at giter8.Runner.$anonfun$run$5(Runner.scala:51)
        at scala.util.Either.flatMap(Either.scala:341)
        at giter8.Runner.$anonfun$run$4(Runner.scala:50)
        at scala.util.Either.flatMap(Either.scala:341)
        at giter8.Runner.run(Runner.scala:49)
        at giter8.Giter8.run(giter8.scala:33)
        at giter8.Giter8.run(giter8.scala:30)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at giter8.LauncherProcessor.call(LauncherMain.scala:113)
        at giter8.LauncherProcessor.virtuallyRun(LauncherMain.scala:87)
        at giter8.LauncherProcessor.process(LauncherMain.scala:38)
        at giter8.Runner.$anonfun$run$9(Runner.scala:54)
        at scala.util.Either.flatMap(Either.scala:341)
        at giter8.Runner.$anonfun$run$5(Runner.scala:51)
        at scala.util.Either.flatMap(Either.scala:341)
        at giter8.Runner.$anonfun$run$4(Runner.scala:50)
        at scala.util.Either.flatMap(Either.scala:341)
        at giter8.Runner.run(Runner.scala:49)
        at giter8.Runner.run(Runner.scala:75)
        at giter8.LauncherMain$.delayedEndpoint$giter8$LauncherMain$1(LauncherMain.scala:12)
        at giter8.LauncherMain$delayedInit$body.apply(LauncherMain.scala:9)
        at scala.Function0.apply$mcV$sp(Function0.scala:39)
        at scala.Function0.apply$mcV$sp$(Function0.scala:39)
        at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:17)
        at scala.App.$anonfun$main$1$adapted(App.scala:80)
        at scala.collection.immutable.List.foreach(List.scala:392)
        at scala.App.main(App.scala:80)
        at scala.App.main$(App.scala:78)
        at giter8.LauncherMain$.main(LauncherMain.scala:9)
        at giter8.LauncherMain.main(LauncherMain.scala)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at coursier.bootstrap.launcher.a.a(Unknown Source)
        at coursier.bootstrap.launcher.Launcher.main(Unknown Source)

expectation

It should have worked or at least given me a lead to go on with the error message.

notes

[magneticflux-]

Here's the line that causes the issue I think:

giter8/library/src/main/scala/g8.scala

Line 211 in fc7f43e

.split(fileSeparator)

The fileSeparator is actually a string, not a character, so it calls the regex version of the split function.

Edit: Since it's actually an internal error, the error message not including the file being processed isn't really an issue.