I'm making my first go at writing a river. (Here's the source code: 
https://bitbucket.org/futurechan/example-river/src)

I followed this tutorial 
http://blog.trifork.com/2013/01/10/how-to-write-an-elasticsearch-river-plugin/

and compared it to this existing river
https://github.com/jprante/elasticsearch-river-jdbc

but I haven't had much luck.

To deploy the river, I created a folder called example-river under plugins, 
dropped my jar in that folder, and restarted the node. Everything starts up 
fine.

I have also tried bin/plugin --url file:///path/to/plugin --install 
example-river, which seems to work, but it unpacks my jar. So, I tried 
zipping it first and then installing, which works and does not unpack my 
jar, but it didn't help.

When I issue this PUT request:

http://localhost:9200/_river/example_river/_meta
{
    "type": "example_river",
  "example_river":{
    "blah":"blah"
  }
}

I get this exception:

[2014-04-20 22:28:46,538][DEBUG][river ] [Gloom] creating river 
[example_river][example_river] 
[2014-04-20 22:28:46,543][WARN ][river ] [Gloom] failed to create river 
[example_river][example_river] 
org.elasticsearch.common.settings.NoClassSettingsException: Failed to load 
class with value [example_river] at 
org.elasticsearch.river.RiverModule.loadTypeModule(RiverModule.java:87) at 
org.elasticsearch.river.RiverModule.spawnModules(RiverModule.java:58) at 
org.elasticsearch.common.inject.ModulesBuilder.add(ModulesBuilder.java:44) at 
org.elasticsearch.river.RiversService.createRiver(RiversService.java:137) at 
org.elasticsearch.river.RiversService$ApplyRivers$2.onResponse(RiversService.java:275)
 at 
org.elasticsearch.river.RiversService$ApplyRivers$2.onResponse(RiversService.java:269)
 at 
org.elasticsearch.action.support.TransportAction$ThreadedActionListener$1.run(TransportAction.jav
a:93) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at 
java.lang.Thread.run(Unknown Source) Caused by: 
java.lang.ClassNotFoundException: example_river at 
java.net.URLClassLoader$1.run(Unknown Source) at 
java.net.URLClassLoader$1.run(Unknown Source) at 
java.security.AccessController.doPrivileged(Native Method) at 
java.net.URLClassLoader.findClass(Unknown Source) at 
java.lang.ClassLoader.loadClass(Unknown Source) at 
sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at 
java.lang.ClassLoader.loadClass(Unknown Source) at 
org.elasticsearch.river.RiverModule.loadTypeModule(RiverModule.java:73) ... 9 
more

Can someone point out what I am missing?

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