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From Korbee Reinout <>
Subject RE: ClassLoader issue when loading custom DSL with GroovyScriptEngine
Date Tue, 29 Mar 2016 07:29:45 GMT
I don't see why you need the GroovyScriptEngine. Maybe the GroovyShell would be the more appropriate
choice to run scripts in this example? In a similar situation in an OSGi bundle I have used:

GroovyClassLoader GROOVY_CLASSLOADER = new GroovyClassLoader();
Class<?> clazz = GROOVY_CLASSLOADER.parseClass(string_with_script_as_text);
Object cc = clazz.newInstance();
Script script = (Script) cc;

And then on the script you can just call: script.setBinding()

And to run I call: 

-----Original Message-----
From: Michael Rüegg [] 
Sent: Donnerstag, 24. März 2016 13:40
Cc: Michael Rüegg <>
Subject: ClassLoader issue when loading custom DSL with GroovyScriptEngine


I have a problem with parsing my own DSL when using GroovyScriptEngine. Here’s the code:

class DslLoader {

 def load(String dsl) {
   CompilerConfiguration config = new CompilerConfiguration(CompilerConfiguration.DEFAULT)
   config.scriptBaseClass =
   ClassLoader parentClassLoader = DslScriptLoader.classLoader
   GroovyClassLoader groovyClassLoader = new GroovyClassLoader(parentClassLoader, config)
   assert parentClassLoader.loadClass('groovy.lang.GroovyObject') != null // NO PROBLEMS HERE
   URL url = new File(‘path/to/my-dsl.jar').toURI().toURL()
   URL[] urlRoots = [url]
   GroovyScriptEngine engine = new GroovyScriptEngine(urlRoots, groovyClassLoader)
   assert engine.groovyClassLoader.loadClass('groovy.lang.GroovyObject') != null // NO PROBLEMS
   Class clazz = engine.groovyClassLoader.parseClass(dsl, 'script’) // HERE I GET java.lang.ClassNotFoundException:
   script = InvokerHelper.createScript(clazz, new Binding())  }


As you can see from the comments, I’m able to load the class ‘groovy.lang.GroovyObject’
when using the same class loader I pass to GroovyScriptEngine. But when I call parseClass(),
my application fails with a 

java.lang.ClassNotFoundException: groovy.lang.GroovyObject

The code above is part of an OSGI bundle which is deployed to a container. groovy-all.jar
is on the bundle class path: 

Bundle-ClassPath: .,META -INF/lib/groovy-all-2.4.4.jar 

I don’t understand why GroovyScriptEngine is not able to load Groovy’s own classes although
the passed class loader can do it. Am I overlooking something? Do you have an idea what is

Thanks in advance,

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