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public class ServerSideScriptingBean
{
    @Inject
    @ScriptLanguage(JavaScript.class)
    private ScriptBuilder scriptBuilder;

    //...

    private Double calc(Double a, Double b)
    {
       return this.scriptBuilder
                .script("x + y")
                .namedArgument("x", a)
                .namedArgument("y", b)
                .eval(Double.class);
    }
}

public class ServerSideScriptingBean
{
    @Inject
    @ScriptLanguage(JavaScript.class)
    private ScriptEngine scriptEngine;

    //...

    protectedprivate Double calc() throws ScriptException 
    {
        return (Double)this.scriptEngine.eval("3 + 4");
    }
}