Blank Rythm output when using @extends

https://stackoverflow.com/questions/21938092

14-10-2022
|

Вопрос

I have an interesting problem. I'm trying to integrate the Rythm template engine into my Spring MVC application, so I wrote a simple view resolver that invokes RythmeEngine to render files. However, when I try to use @extends(...), the engine returns a blank render. I have two template files:

layout.html

<!DOCTYPE html>
<html>
<head>
    <title>Rythm Sandbox</title>
</head>
<body>
    <h1>Welcome!</h1>
    @render()
</body>
</html>

rhythm.html

@extends(layout)
Hello World!

I am invoking RythmEngine as follows:

RythmEngine eng = RythmEngineFactory.getEngine();
File f = new File(someRootPath + name + ctx.getSuffix());
resp.setContentType("text/html");
eng.render(httpResponse.getWriter(), f, model);

And RythmEngineFactory.getEngine() returns a singleton RythmEngine with the following configuration:

Map<String, Object> props = new HashMap<String, Object>();
props.put("engine.mode", "dev");
props.put("home.template.dir", myTemplateRootDirectoryPath);
return new RythmEngine(props);

Problem

Here's the problem: without the @extends(layout) line in rhythm.html, I get a render "Hello World" as expected. However, when I try to extend layout.html, it results in a blank render (i.e., no output at all). I know it's finding the layout.html file, because if I replace @extends(layout) with something like @extends(layoutGooBlah), the error message says "Cannot find extended template by name 'layoutGooBlah'". So I know it's finding my template fine, but why would the output be blank??

Edit:

Interesting phenomenon: when I change this line:

eng.render(httpResponse.getWriter(), f, model);

To:

String s = eng.render(f, model);
httpResponse.getWriter().write(s);

It works. ??? Why won't it write to a PrintStream when using @extends??

Решение

The API engine.render(writer, ...) is buggy. See https://github.com/greenlaw110/Rythm/issues/201

BTW, I recommend you use http://github.com/greenlaw110/spring-rythm for your spring MVC application

Лицензировано под: CC-BY-SA с атрибуция

Не связан с StackOverflow