description=hello - A web front end for an elastic search cluster
version=master
name=hello

version=2.3.1

### mandatory elements for site plugins:
#
# 'site': set to true to indicate contents of the _site/
#  directory in the root of the plugin should be served.
site=false
#
### mandatory elements for jvm plugins :
#
# 'jvm': true if the 'classname' class should be loaded
#  from jar files in the root directory of the plugin.
#  Note that only jar files in the root directory are
#  added to the classpath for the plugin! If you need
#  other resources, package them into a resources jar.
jvm=true
#
# 'classname': the name of the class to load, fully-qualified.
classname=${elasticsearch.plugin.classname}
#
# 'java.version' version of java the code is built against
# use the system property java.specification.version
# version string must be a sequence of nonnegative decimal integers
# separated by "."'s and may have leading zeros
java.version=1.7
#
# 'elasticsearch.version' version of elasticsearch compiled against
# You will have to release a new version of the plugin for each new
# elasticsearch release. This version is checked when the plugin
# is loaded so Elasticsearch will refuse to start in the presence of
# plugins with the incorrect elasticsearch.version.
elasticsearch.version=2.3.1
#
### deprecated elements for jvm plugins :
#
# 'isolated': true if the plugin should have its own classloader.
# passing false is deprecated, and only intended to support plugins 
# that have hard dependencies against each other. If this is
# not specified, then the plugin is isolated by default.
#isolated=true

Exception in thread "main" ElasticsearchException[Could not find plugin class [elasticsearch.plugin.HelloPlugin]]; nested: ClassNotFoundException[elasticsearch.plugin.HelloPlugin];
Likely root cause: java.lang.ClassNotFoundException: elasticsearch.plugin.HelloPlugin
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at java.net.FactoryURLClassLoader.loadClass(URLClassLoader.java:810)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at org.elasticsearch.plugins.PluginsService.loadPluginClass(PluginsService.java:463)
	at org.elasticsearch.plugins.PluginsService.loadBundles(PluginsService.java:431)
	at org.elasticsearch.plugins.PluginsService.<init>(PluginsService.java:129)
	at org.elasticsearch.node.Node.<init>(Node.java:158)
	at org.elasticsearch.node.Node.<init>(Node.java:140)
	at org.elasticsearch.node.NodeBuilder.build(NodeBuilder.java:143)
	at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:178)
	at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:270)
	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:35)
Refer to the log for complete error details.

package es_client.yxp;

import java.util.Arrays;
import java.util.List;

import org.elasticsearch.plugins.Plugin;
import org.elasticsearch.rest.RestHandler;
import org.elasticsearch.rest.RestModule;


public class HelloPlugin extends Plugin {
	public List<Class<HelloRestAction>> getRestHandlers() {
	       return Arrays.asList(HelloRestAction.class);
	}

	@Override
	public String name() {
		// TODO Auto-generated method stub
		return "hello";
	}

	@Override
	public String description() {
		// TODO Auto-generated method stub
		return "diyici使用插件";
	}
	
	public void onModule(RestModule module) { 
		module.addRestAction(HelloRestAction.class); 
		} 
}

package es_client.yxp;

import org.elasticsearch.client.Client;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.BytesRestResponse;
import org.elasticsearch.rest.RestChannel;
import org.elasticsearch.rest.RestController;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.RestRequest.Method;
import org.elasticsearch.rest.RestStatus;

public class HelloRestAction extends BaseRestHandler {
    @Inject   
	public HelloRestAction (Settings settings, RestController controller, Client client) {
		super(settings, controller, client);    
		controller.registerHandler(Method.GET, "/_hello", this);
	}

	@Override
	protected void handleRequest(RestRequest request, RestChannel channel, Client client) throws Exception {
		// TODO Auto-generated method stub
		 String clustername = client.settings().get("cluster.name");
	      channel.sendResponse(new BytesRestResponse(RestStatus.OK, XContentFactory.jsonBuilder().startObject().field("hello", "This is cluster –"+clustername).endObject()));

	}
}

-> Installing from file:/Users/yinxingpan/Downloads/hello.zip...
Trying file:/你的目录hello.zip ...
Downloading .DONE
Verifying file:/你的目录/hello.zip checksums if available ...
NOTE: Unable to verify checksum for downloaded plugin (unable to find .sha1 or .md5 file to verify)
Installed hello into /你的目录/elasticsearch-2.3.1/plugins/hello