In the end I had to do some ugly classpath overriding to get it to work in the way I expected by writing my own modified version of Spring’s HandlerMethodInvoker. If you hit similar issues I suggest following this JIRA: http://jira.springframework.org/browse/SPR-7114 and feel free to use the attached code on the JIRA. It’s been working great for me now.

I’m using Eclipse 3.5 with the IvyDE plugin. With those installed I created a new Java Project and then set about creating my ivy.xml. My projects pretty much all have the same basic dependencies

• Spring (3.0.3.RELEASE since that’s the latest)
• Hibernate (3.5.3.Final)
• Hibernate-search (Makes indexing my model nice and easy)
• Jodatime (Awesome for date manipulation)
• Jodatime-hibernate
• H2 database (I always start of with a mock in-memory at start of dev and then use some JPA magic to dump out a schema to DB2 or Sybase, or whatever else DB is in use)
• SLF4J (My logging api of choice)
• Jackson (For any restful services I might write)

Here’s my ivy.xml

< ?xml version="1.0" encoding="UTF-8"?>
< ?xml-stylesheet type="text/xsl" href="http://ivyrep.jayasoft.org/ivy-doc.xsl"?>
<ivy -module xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://incubator.apache.org/ivy/schemas/ivy.xsd" version="1.3">

	<info organisation="mattgoldspink" module="gtdtd" revision="1.0.0" status="integration">
		<license name="Apache 2.0" url="http://www.apache.org/licenses/LICENSE-2.0"/>
	</info>

	<configurations>
		<conf name="compile" visibility="public" description="Maven compile dependencies"/>
		<conf name="runtime" visibility="public" extends="compile" description="Runtime dependencies"/>
		<conf name="test" visibility="private" description="Test dependencies"/>
	</configurations>

	<dependencies>
		<dependency org="org.springframework" name="org.springframework.spring-library" rev="3.0.3.RELEASE" conf="runtime->runtime" />
		</dependency><dependency org="org.hibernate" name="hibernate-core" rev="3.5.3-Final" conf="runtime->*" />
		</dependency><dependency org="com.h2database" name="h2" rev="1.2.137" conf="runtime->*" />
		</dependency><dependency org="org.hibernate" name="hibernate-validator" rev="4.0.2.GA" conf="runtime->*" >
			<exclude org="org.slf4j" name="slf4j-log4j12" />
		</dependency>
		<dependency org="org.hibernate" name="hibernate-entitymanager" rev="3.5.3-Final" conf="runtime->*" />
		</dependency><dependency org="org.hibernate" name="hibernate-search" rev="3.2.0.Final" conf="runtime->*">
			<exclude org="javax.jms" name="jms" />
		</dependency>
		<dependency org="joda-time" name="joda-time" rev="1.6" conf="runtime->*" />
		</dependency><dependency org="org.hibernate.javax.persistence" name="hibernate-jpa-2.0-api" rev="1.0.0.Final" conf="runtime->*" />
		</dependency><dependency org="joda-time" name="joda-time-hibernate" rev="1.2" conf="runtime->*">
			<exclude org="org.hibernate" name="hibernate" />
		</dependency>
		<dependency org="org.slf4j" name="slf4j-api" rev="1.5.6" conf="runtime" force="true"/>
		<dependency org="org.slf4j" name="slf4j-log4j12" rev="1.5.6" conf="runtime" force="true"/>
		<dependency org="org.codehaus.jackson" name="jackson-core-lgpl" rev="1.5.3" conf="runtime" />
		<dependency org="org.codehaus.jackson" name="jackson-mapper-lgpl" rev="1.5.3" conf="runtime->*" />
	</dependency></dependencies>

</ivy>

I’m going to get my spring dependencies from Springsource’s ivy/maven repository, but everything else will come from a mix of JBoss and Maven2 repo’s. Here’s the ivy-settings.xml

< ?xml version="1.0" encoding="ISO-8859-1"?>
<ivysettings>

	<caches artifactPattern="[organisation]/[module]/[revision]/[artifact].[ext]" />
	<settings defaultResolver="ibiblio.jboss.java-net.springsource" checkUpToDate="true" />

	<resolvers>
		<chain name="ibiblio.jboss.java-net.springsource">
			<ibiblio name="ibiblio" m2compatible="true" />
			<ibiblio name="jboss" m2compatible="true"
				root="https://repository.jboss.org/nexus/content/groups/public-jboss" />
			<ibiblio name="java.net" m2compatible="true"
				root="https://repository.jboss.org/nexus/content/repositories/java.net-m2/" />
			<ibiblio name="java.net" m2compatible="true"
				root="http://repository.codehaus.org/" />
			<url name="com.springsource.repository.libraries.release">
				<ivy pattern="http://repository.springsource.com/ivy/libraries/release/[organisation]/[module]/[revision]/[artifact]-[revision].[ext]" />
				<artifact pattern="http://repository.springsource.com/ivy/libraries/release/[organisation]/[module]/[revision]/[artifact]-[revision].[ext]" />
			</url>

			<url name="com.springsource.repository.libraries.external">
				<ivy pattern="http://repository.springsource.com/ivy/libraries/external/[organisation]/[module]/[revision]/[artifact]-[revision].[ext]" />
				<artifact pattern="http://repository.springsource.com/ivy/libraries/external/[organisation]/[module]/[revision]/[artifact]-[revision].[ext]" />
			</url>
			<url name="com.springsource.repository.bundles.release">
				<ivy pattern="http://repository.springsource.com/ivy/bundles/release/[organisation]/[module]/[revision]/[artifact]-[revision].[ext]" />
				<artifact pattern="http://repository.springsource.com/ivy/bundles/release/[organisation]/[module]/[revision]/[artifact]-[revision].[ext]" />
			</url>

			<url name="com.springsource.repository.bundles.external">
				<ivy pattern="http://repository.springsource.com/ivy/bundles/external/[organisation]/[module]/[revision]/[artifact]-[revision].[ext]" />
				<artifact pattern="http://repository.springsource.com/ivy/bundles/external/[organisation]/[module]/[revision]/[artifact]-[revision].[ext]" />
			</url>
		</chain>

	</resolvers>
</ivysettings>

After plugging the above into Eclipse and setting up my IvyDE classpath container to use the new ivy-settings.xml file there was one more thing to do which was to tell IvyDE what type the source jars were. Go to “Window” -> “Preferences”, find “Ivy” -> “Classpath” in the tree and on that page under the option for “Source types” enter “source,src,srcs”. Save and you should get source code attachment to the jars too. Note that you can tell your Eclipse project to use the ivy-settings within it by going right clicking on your Ivy classpath container and under “Ivy Settings Path” enter project:///ivy-settings.xml

Here it is: BBC Essential Mix Trackisting for Android, Ipad and Iphone

I’ll post later this week details about how it works. For now take a look at the source code and enjoy.

1. Getting the tracklisting from the BBC
   This basically involved me picking out a rough top level element from an essential mix page of tracks (firebug is lord). This resulted in the below YQL query:

   select * from html where url="http"+"://ww"+"w.bbc.co.uk/programmes/b00sdb2z" and xpath='//div[@class="title" or @class="title with-image"]'
   

2. Now getting this into a simple Ext.js ListView
   It was obvious to me I needed a Ext.data.ScriptTagProxy to achieve this in order to get the JSON-P cross domain call. Unfortunately the hard bit is getting the JSON from the YQL call into the right format for my JsonStore in Ext. Thankfully Ext has all the necessary hooks to do this it looks something like:

   var dataStore = new Ext.data.JsonStore(
   	{
   		proxy : new Ext.data.ScriptTagProxy(
   			{
   				url : 'http'+'://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20html%20where%20url%3D%22http%3A%2F%2Fw'+'ww.bbc.co.uk%2Fprogrammes%2Fb00sdb2z%22%20and%0A%20%20%20%20%20%20xpath%3D\'%2F%2Fdiv%5B%40class%3D%22title%22%20or%20%40class%3D%22title%20with-image%22%5D\'&format=json',
   				callbackParam: 'callback',
   				restful: true
   			}
   		),
   		root: 'query.results.div',
   		fields: [{
                       name : 'artist',
                       convert : Ext.ux.mattgoldspink.bbcessentialmix.getArtistFromJson
                   },{
                       name : 'track',
                       convert : Ext.ux.mattgoldspink.bbcessentialmix.getTitleFromJson
                   }],
   		allowBlank: false
   	}
   );
   

   Where the convert functions were:

   function js_traverse(o, keyName) {
   	var type = typeof o;
   	if (o.class && o.class === keyName)
   	{
   		return o.content;
   	}
   	if (type == "object") {
   		for (var key in o) {
   			var output = js_traverse(o[key], keyName);
   			if (output) {
   				return output;
   			}
   		 }
   	} else {
   		return undefined;
   	}
   };
   
   Ext.ux.mattgoldspink.bbcessentialmix.getArtistFromJson = function(v, rec) {
   	var artist = js_traverse(rec, 'artist');
   	if (artist) {
   			return artist;
   	} else {
   		return 'Unknown';
   	}
   };
   
   Ext.ux.mattgoldspink.bbcessentialmix.getTitleFromJson = function(v, rec) {
   	var artist = js_traverse(rec, 'track');
   	if (artist) {
   			return artist;
   	} else {
   		return 'Unknown';
   	}
   };
   

   The interesting part here is that the BBC very helpfully markup all their tags so all I had to do was traverse the messy JSON tree until I found a class which marked either the title or artist and then return it (or ‘Unknown’ if it was there).
   Next we plug this into our Ext.ListView:

   var listView = new Ext.list.ListView({
   	id: 'listview',
   	store: dataStore,
   	multiSelect: true,
   	emptyText: 'No tracks found',
   	columnSort: false,
   	loadingText: 'Updating tracklist',
   	tpl: new Ext.XTemplate(
   	'<tpl for="rows">',
   		'</tpl>&lt;tpl exec="values.row = xindex;">',
   			'<dl>',
   				'<tpl for="parent.columns">',
   				'<dt style="width:{[values.width*100]}%;text-align:{align};">',
   				'<em unselectable="on"<tpl if="cls">',
                                   ' class="{cls}</em></dt></tpl>">',
   					'{[values.tpl.apply(parent)]}',
   				'<div class="x-clear"></div>',
   			'</dl>',
   		''
   	),
   	columns: [
   	{
   		header: 'Track #',
   		width: 0.04,
   		align: 'left',
   		dataIndex: 'row'
   	},{
   		header: 'Artist',
   		width: 0.48,
   		align: 'left',
   		dataIndex: 'artist'
   	},{
   		header: 'Track',
   		width: 0.48,
   		align: 'left',
   		dataIndex: 'track'
   	}]
   });
   

   This code is a bit more complicated than I expected because by default Ext.ListView does not with the Ext.grid.RowNumberer, so after a bit of google-fu I discovered a post showing how to achieve this using the tpl property.

3. Getting all the possible Essential Mixes
   I decided I’d add a TreePanel so you can pick other essential mixes and view their tracks too. To do this I needed to jump back to firebug and YQL to get the available tracklists. In short my YQL query ended up being

   select * from html where url="http://www.bbc.co.uk/programmes/b006wkfp/episodes/2009" and xpath='//a[@class="url"]'

4. Getting the TreePanel to pull in the data from YQL
   Again this is something I thought was going to be tough, but after looking at a few blog posts and examples I realised it was possible. My final TreeLoader implementation looks like:

   Ext.ux.mattgoldspink.bbcessentialmix.TreeLoader = function(){
   	Ext.ux.mattgoldspink.bbcessentialmix.TreeLoader.superclass.constructor.call(this);
   	this.proxy = new Ext.data.ScriptTagProxy({
   		url : this.dataUrl,
   		callbackParam: 'callback',
   		restful: true
   	});
   };
   Ext.extend(Ext.ux.mattgoldspink.bbcessentialmix.TreeLoader, Ext.tree.TreeLoader, {
   	dataUrl: 'http:'+'//query.yahooapis.com/v1/public/yql?'
   +'q=select%20*%20from%20html%20where%20url%3D'
   +'%22http%3A%2F%2Fwww.bbc.co.uk%2Fprogrammes'
   +'%2Fb006wkfp%2Fepisodes%2F2010%22%20and%0A'
   +'%20%20%20%20%20%20xpath%3D\'%2F%2Fa%5B'
   +'%40class%3D%22url%22%5D\'&format=json',
   	requestData : function(node, cb){
   		this.proxy.setApi(
                        Ext.data.Api.actions.read,
                        'http'+'://query.yahooapis.com/v1/public/yql?'
   +'q=select%20*%20from%20html%20where%20url'
   +'%3D%22http%3A%2F%2Fww'
   +'w.bbc.co.uk%2Fprogrammes%2F'
   +'b006wkfp%2Fepisodes%2F' + node.attributes.nodeid
   + '%22%20and%0A%20%20%20%20%20'
   +'%20xpath%3D\'%2F%2Fa%5B%40class'
   +'%3D%22url%22%5D\'&format=json');
   		this.proxy.request('read', null, {}, {
   			readRecords : function(o){
   				return o.query.results.a;
   			}
   		}, this.addNodes, this, {node:node, cb:cb});
   	},
   	addNodes : function(o, arg){
   		var node = arg.node;
   		for(var i = 0, len = o.length; i < len; i++){
   			var foo = {};
   			foo.text = o[i].span.content,
   			foo.url =  o[i].href.replace("/programmes/", '');
   			foo.leaf = true;
   			var n = this.createNode(foo);
   			if(n){
   				node.appendChild(n);
   			}
   		}
   		arg.cb(this, node);
   	}
   });
   

   The key bits here are that before I request data for a node I change the YQL query to pick up the data for the year node that was clicked. Then once the results come back I pull out the results node from the JSON and in my addNodes function I set up leaf node.

5. The onclick callback to reload the ListView with new tracklists
   When someone clicks one of these new tracklist nodes in the TreePanel we want to update the ListView. This was done by adding a listener to the TreePanel:

   listeners: {
   	click: function(n) {
   		Ext.getCmp('listview').getStore().proxy.setApi(
                        Ext.data.Api.actions.read,
   'http://query.yahooapis.com/v1/public/yql?'
   +'q=select%20*%20from%20html%20where'
   +'%20url%3D%22http%3A%2F%2Fww'
   +'w.bbc.co.uk%2Fprogrammes%2F' + n.attributes.url
   +'%22%20and%0A%20%20%20%20%20%20'
   +'xpath%3D\'%2F%2Fdiv%5B%40class%3D'
   +'%22title%22%20or%20%40class%3D'
   +'%22title%20with-image%22%5D\'&format=json');
   		Ext.getCmp('listview').getStore().load();
   	}
   }
   

   We simply change the read action url in the ListView store’s proxy, then we reload the store! As simple as that.

To wrap it up I put it all in an Ext.Viewport. Feel free to view the source of the page and enjoy!
http://www.mattgoldspink.co.uk/bbcradiolastfm.html

sudo apt-get install jsvc

got me sorted and Subsonic is back alive!

Broken Home Set (demo) 2001  by  mattgoldspink

http://www.htfr.com/more-info/?catno=MR227279

Unfortunately it was not in stock and was noted as being DELETED. Given the track was a white label I expected it to never re-surface but since htfr have the option to add something to your wishlist I do so anyway. 4 and half years later an email pops into my inbox saying

KISS (2004 REMIX) by PRINCE is now in stock

Buy buy buy!!!! So I did and i got it!

Anyway, since I can only get it on vinyl I figured I should have a play on the wheels of steel and made a quick mix and upload it as usual. So here is a mix with the Kiss track about 1/2 way through. Enjoy!

Download link: KISS (2004 REMIX) by PRINCE is now in stock.mp3 (mp3, 38Mb, 40min)

Tracklist:

1. Hypocrites (Naked Funk Remix) – Junior Delgado
2. To The Beat (The Light Mix) – PFN
3. My House Is Your House – Phil Keiron
4. Disciples of the watch – The Insiders
5. Let The Good Times Rol – Layo And Bushwacka!
6. Under Control – Freeland
7. Widemouth (Dub Pistols Muthafuckin’ mix) – Supercharger
8. KISS (2004 REMIX) – PRINCE (Remix is actually by Soul Of Man)
9. Scram – Plump DJs
10. Lethal Cut – Propellerheads
11. Because of You – Scanty Sandwich
12. Mayhem – Agent Sumo