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POPlayFramework2 Scala File Map
 

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    <p>I'm just starting with Scala and have run into a problem that has me stumped, but I'm guessing that I'm missing something easy.</p> <p>I was following instructions to use the Clapper ClassFinder: <a href="http://thoughts.inphina.com/2011/09/15/building-a-plugin-based-architecture-in-scala/" rel="nofollow">http://thoughts.inphina.com/2011/09/15/building-a-plugin-based-architecture-in-scala/</a></p> <pre><code>val classpath = List("./plugins").map(new File(_)) val finder = ClassFinder(classpath) val classes = finder.getClasses val classMap = ClassFinder.classInfoMap(classes) </code></pre> <p>After executing the first line, I see that classpath is set simply to List(.\plugins) I'm running this on windows, so the swapping of the slash seems to be OK. But I expected to see a list of File objects, although I am not sure about this Scala syntax, and perhaps I'm missing something in the Scala IDE. The value for classes shows an "empty iterator".</p> <p>It seems not to be finding any files in the path that I specified. I tried using an absolute path, but I had the same results. I have a single jar file in the plugins directory that I'm hoping it will find. The plugins directory is at the root of the Play2 project I'm using.</p> <p>Edit --- I did find that when I explicitly list the path to one jar that it is able to find it:</p> <pre><code>val classpath = List("./plugins/myPlugin.jar").map(new File(_)) </code></pre> <p>But I want to find all jar files in the directory. The following didn't work:</p> <pre><code>val classpath = List("./plugins/*").map(new File(_)) </code></pre> <p>Nor did this:</p> <pre><code>val classpath = List("./plugins/*.jar").map(new File(_)) </code></pre>
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    1. USGeorge Hernando
    1. USGeorge Hernando
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    1. COJust a clarification on the syntax: `List(...).map(...)` means "take the function inside map and apply it to every element of the list". Here your list has only one element (`"./plugins"`), so `List("./plugins").map(new File(_))` is equivalent to `List(new File("./plugins"))`
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      1. POPlayFramework2 Scala File Map
      1. USPaolo Falabella
 

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