在javax.script中加载javascript库?

Protovis 从Java中获取javascript并得到经过评估的SVG代码。我正在使用javax.script.*运行Javascript:

public static void EvalScript() throws Exception {
    ScriptEngineManager factory = new ScriptEngineManager();
    ScriptEngine engine = factory.getEngineByName("JavaScript");
    Object result = engine.eval("var vis = new pv.Panel().width(300).height(300)
        .add (pv.Line).data ([1,0.5, 0.1, 0.01, 0.001, 0.3, 0.2,0.1,1])
           .left (function () { return this.index * 30; })
           .bottom (function (d) { return d * 250; });
        vis.root.render();
        vis.scene[0].canvas.innerHTML;");         
    System.out.println(result);
}

这会抱怨,因为我从来没有加载Protovis本身,通常会这样做

<script type="text/javascript" src="../protovis-r3.1.0.js"></script>