玩！无法将java列表转换为scala列表 [英] Play! failing to convert java list to scala list

问题描述

我正在尝试将我的java控制器中的字符串列表传递给scala模板。

这是查看代码：

I'm trying to pass a list of strings from my java controller to the scala template.
This is the view code:

public static Result index() {
    List<String> scripts = Arrays.asList(
        "script1.js",
        ...
        "scriptN.js"
    );

    return ok(views.html.index.render(scripts));
}

这是诱惑代码：

@(scripts: List[String])

@main("test page")(scripts) {
    ... html here ...
}

我得到的错误（在Typesafe中）激活编译页面）：

The error I'm getting (in the Typesafe Activation Compile page):

类索引中的方法呈现不能应用于给定类型;
需要
：scala .collection.immutable.List

found：java.util.List

reason：实际参数java.util.List不能转换为scala.collection.immutable.List by
方法调用转换

method render in class index cannot be applied to given types;
required: scala.collection.immutable.List
found: java.util.List
reason: actual argument java.util.List cannot be converted to scala.collection.immutable.List by method invocation conversion

有没有办法解决它而不使用java> scala转换？

我发现了这个问题： Play不转换java-list scala-list 描述了类似的情况，虽然我没有任何templateImports我知道，我甚至没有看到Build.scala文件...

Is there a way to solve it without using the java > scala conversions?
I found this question: Play doesn't convert java-list to scala-list which describes a similar situation, though I do not have any templateImports that I'm aware of, I don't even see a Build.scala file...

任何想法？
谢谢！

Any ideas? Thanks!

推荐答案

请尝试以下操作：

import scala.collection.JavaConverters;

public static Result index() {
    List<String> scripts = Arrays.asList(
        "script1.js",
        ...
        "scriptN.js"
    );
    scala.collection.immutable.List<String> ls = JavaConverters.asScalaBufferConverter(scripts).asScala().toList();
    return ok(views.html.index.render(ls));
}

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