NoSuchMethodError when using scalate

FooBarFreak

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Feb 24, 2013, 9:44:26 AM2/24/13

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Hi together,

I am new to scala and scalate. I am using the 1.6.1 version from maven central for scala 2.10. When I try to execute the following code:

val engine = new TemplateEngine
val output = engine.layout("/templates/map.mustache")

I get the following Error:

Caused by: java.lang.NoSuchMethodError: scala.reflect.internal.TreeInfo.firstArgument(Lscala/reflect/internal/Trees$Tree;)Lscala/reflect/internal/Trees$Tree;
at scala.tools.nsc.typechecker.Typers$Typer.parentTypes(Typers.scala:1550) ~[scala-compiler-2.10.0.jar:na]
at scala.tools.nsc.typechecker.Namers$Namer.templateSig(Namers.scala:861) ~[scala-compiler-2.10.0.jar:na]
at scala.tools.nsc.typechecker.Namers$Namer.getSig$1(Namers.scala:1300) ~[scala-compiler-2.10.0.jar:na]
at scala.tools.nsc.typechecker.Namers$Namer.typeSig(Namers.scala:1347) ~[scala-compiler-2.10.0.jar:na]
[... Stacktrace shortened ...]
at scala.tools.nsc.Global$Run.compile(Global.scala:1654) ~[scala-compiler-2.10.0.jar:na]
at org.fusesource.scalate.support.ScalaCompiler.compile(ScalaCompiler.scala:100) ~[scalate-core_2.10-1.6.1.jar:1.6.1]
at org.fusesource.scalate.TemplateEngine.compileAndLoad(TemplateEngine.scala:757) ~[scalate-core_2.10-1.6.1.jar:1.6.1]
... 54 common frames omitted

The Top level Exception is:

org.fusesource.scalate.TemplateException: scala.reflect.internal.TreeInfo.firstArgument(Lscala/reflect/internal/Trees$Tree;)Lscala/reflect/internal/Trees$Tree;

Does anybody have an Idea? My Template contains no mustache Elements:

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<style type="text/css">
html { height: 100% }
body { height: 100%; margin: 0; padding: 0 }
#map_canvas { height: 100% }
</style>
<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?key=...&sensor=true"></script>
<script type="text/javascript" src="/assets/js/jquery.min.js"></script>
<script type="text/javascript" src="/assets/js/foo.js"></script>
<script type="text/javascript" src="/assets/js/main.js"></script>
</head>
<body onload="initialize();">
<div id="map_canvas" style="width:100%; height:100%"></div>
</body>
</html>

It seems like maybe my classpath is wrong. I am starting the project using an Eclipse run configuration. Here is a "screenshot" of my Eclipse classpath. I am using the latest Scala IDE version as of today.

https://dl.dropbox.com/u/26457336/classpath-scalate-20130223.jpg

Any hints on how to approach this problem would be highly welcome.

Thanks a lot,

Sebastian

Rafał Krzewski

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Feb 27, 2013, 10:44:08 AM2/27/13

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java.lang.NoSuchMethodError and it's ilk usually signal inconsistent classpath.

At first glance it appears that you have scala-reflect.jar on your classpath that is not scala-reflect-2.10.0.jar

It needs to be in perfect agreement with scala-library and scala-compiler jars. That's the first thing I'd check here.

cheers,
Rafał

FooBarFreak

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Feb 27, 2013, 4:56:52 PM2/27/13

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Hi Rafal,

that seems to be the problem. The Eclipse IDE Plugin bundles Scala 2.10 M1 in which the firstArgument method is missing on TreeInfo. It is there in scala-reflect-2.10.jar. So it seems to be some classloading issue with the Eclipse IDE plus having the scala-*-2.10.0.jars on the classpath. What is strange is that the classpath ordering does not seem to be appropriate since the eclipse scala plugin library comes last in the classpath. Anyway: It has nothing to do with scalate.

Interestingly enough If I bundle my application using onejar I get the error object scala.runtime in compiler mirror not found. I have to say that the whole scala reflection classpath system is quite confusing for a new user like me.

Thanks a lot for the help anyway. I now have a direction to direct my research towards.