How to load the modified classes which has been imported to scalate without jetty-restart?

I am using scalate as my view templates, and sbt + jrebel. But I found if the classes imported to scalate has been modified, we have to restart jetty, or there may be complication errors.

The code is pretty simple:

webapp/WEB-INF/web.xml

<web-app version="2.5">
  <filter>
    <filter-name>TemplateEngineFilter</filter-name>
    <filter-class>org.fusesource.scalate.servlet.TemplateEngineFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>TemplateEngineFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filt开发者_StackOverflow社区er-mapping>
</web-app>

src/main/scala/test.scala

package test

object A {
    def a() = "AAA"
}

webapp/index.jade

- import test.A._
= a()

Disable jetty's auto-reload

class TestProject(info: ProjectInfo) extends DefaultWebProject(info) {
    override val scanDirectories = Nil
}

Then start jetty:

> sbt
> jetty-run
> ~prepare-webapp

Visit home page:

http://localhost:8080/

It displays correct:

AAA

Then I modify the test.scala as:

package test

object A {
    def a() = "AAA#######"
}

Visit page again, correct:

AAA#######

Then modify the method name:

package test

object A {
    def b() = "AAA#######"
}

and index.jade invoke b():

- import test.A._
= b()

Visit again, show error:

Server Error: We're sorry, but something went wrong.
We've been notified about this issue and we'll take a look at it shortly.

From this sample we don't know where is wrong, but in my another project, we can see the reason: Failed compiling index.jade, value b() is not found

So I have to restart jetty:

> jetty-restart

Visit again, and everything goes well.

How to fix this issue, or is there any other way to work with scalate without restarting?

UPDATE

After nearly 1 week of trying, I have to give up. I tried all the solutions I can find, but it still can't be compiled without restart.

Now, I just run sbt without jrebel, and let jetty reload the webapp when classes are modified(not monitor scalate views). For now, it takes 3 to 5 seconds, which is not too long.

Finally, thanks for @James' help

See the answer on the user list

What mode are you running in? I believe the system property scalate.mode is defaulted to production in the source (https://github.com/scalate/scalate/blob/master/scalate-core/src/main/scala/org/fusesource/scalate/TemplateEngine.scala)