Hi All, I'm getting this strange error and cannot understand the reason... WELD-001423 Cannot enable the same alternative bean class class com.sebas.CurrencyExchangeWebservicexNetImp in beans.xml here is the code public class CurrencyExchangerHelper { @Inject static CurrencyExchangeService currencyExchangeService; ... } public interface CurrencyExchangeService { ... } public class CurrencyExchangeMockImp implements CurrencyExchangeService{ ... } @Alternative public class CurrencyExchangeWebservicexNetImp implements CurrencyExchangeService { ... } and my beans.xml <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/beans_1_0.xsd"> <alternatives> <class>com.sebas.CurrencyExchangeWebservicexNetImp</class> </alternatives> <decorators/> <interceptors/> </beans> any ideas ? (running Glassfish 3.0.1) -- Sebastian E. Ovide