Hi, I have a problem with DelegatingMetaClass. I am trying to extend groovy.sql.Sql class with a static method similar to newInstance but that takes only one parameter ( a file name that contains all the connection parameters ) So I have used DelegatingMetaClass conventions and here is my SqlMetaClass.groovy: ------------------------ package groovy.runtime.metaclass.groovy.sql import groovy.sql.Sql class SqlMetaClass extends groovy.lang.DelegatingMetaClass { SqlMetaClass(MetaClassRegistry a_registry, final Class a_class) { super(a_class); } public Object invokeStaticMethod(Object a_object, String a_methodName, Object[] a_arguments) { if(a_methodName == 'newInstance'){ if(a_arguments.length == 1) { //interpret the first argument as a file name Properties props = new Properties() props.load(new FileInputStream(a_arguments[0])) return Sql.newInstance(props['db.url'],props['db.user'], props['db.password'], props['db.drivername']) } } return super.invokeStaticMethod(a_object, a_methodName, a_arguments) } } ------------------------ Afterwards calling Sql.newInstance('hsql.properties') in some script worked as expected. My problem is that it works only from eclipse, the moment I try to use it standalone I get some errors: 1. Calling the script as groovy -cp ../bin-groovy bug.groovy ( using the compiled class generated by the eclipse plug-in ) I get: Caught: java.lang.VerifyError: (class: groovy/runtime/metaclass/groovy/sql/SqlMetaClass, method: super$2$invokeMethod signature: (Ljava/lang/Class;Ljava/lang/Object;Ljava/lang/String;[Ljava/lang/Object;ZZ)Ljava/lang/Object Illegal use of nonvirtual function call at bug.run(bug.groovy:4) at bug.main(bug.groovy) 2. Calling the script as groovy -cp ../clazzez bug.groovy gives me : Caught: java.lang.VerifyError: (class: groovy/runtime/metaclass/groovy/sql/SqlMetaClass, method: super$2$setUseReflection signature: (Z)V) Illegal use of nonvirtual function call at bug.run(bug.groovy:4) at bug.main(bug.groovy) where clazzez is the directory where I compiled the SqlMetaClass.groovy file using groovyc <?xml version="1.0"?> <project name="Compile a groovy class" default="compile" basedir="."> <target name="compile"> <taskdef name="groovyc" classname="org.codehaus.groovy.ant.Groovyc" /> <groovyc srcdir="scripts/groovy" destdir="clazzez"> </groovyc> </target> </project> Environment WinXP SP2 The eclipse plugin is V 1.0.1 installed on Eclipse 3.3.0 When trying to run the script standalone I use Groovy Version: 1.1-rc-1 JVM: 1.6.0_03-b05