Attribute customizations implemented in java

Hi,
I'd like to set an attribute value of a work item based on other attribute of other work items.
I'm implementing this customization in java and I've followed at the end of Page the instructions in https://jazz.net/wiki/bin/view/Main/AttributeCustomization
My test have been developed and tested with RTC version 3.0.1.2

This is what I have discovered so far.

1. Editing the plug-in configuration I've added the following dependencies:

• com.ibm.team.workitem.common
• com.ibm.team.repository.common
• org.eclipse.core.runtime

but on the Extensions tab, when I add a new extension of type com.ibm.team.workitem.common.attributeValueProviders I get a warning a "no schema found for the 'com.ibm.team.workitem.common.attributeValueProviders' extension point". Despite the instructions, on the new extension I don't get any menu that allow me to choose what category my new customization should be created for (condition/defaultValueProvider/validator/valueProvider/valueSetProvider).

So I had to manually configure its mandatory attributes.

2. Just to test, I've created a simple plugin (without make reference to any services) that return just a List of strings. I've provisioned the RTC server and Eclipse clients and configured attribute to use the new customization. Until now the attribute customization implemented in Java works fine.

3. To retrieve Summary attribute of other work items that my class should return I've modified my class:

package com.ibm.team.workitem.customization;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.runtime.IProgressMonitor;

import com.ibm.team.common.ProcessProperty;
import com.ibm.team.process.common.IProjectAreaHandle;
import com.ibm.team.repository.common.TeamRepositoryException;
import com.ibm.team.repository.service.AbstractService;
import com.ibm.team.workitem.common.IQueryCommon;
import com.ibm.team.workitem.common.IWorkItemCommon;
import com.ibm.team.workitem.common.expression.AttributeExpression;
import com.ibm.team.workitem.common.expression.IQueryableAttribute;
import com.ibm.team.workitem.common.expression.IQueryableAttributeFactory;
import com.ibm.team.workitem.common.expression.QueryableAttributes;
import com.ibm.team.workitem.common.internal.attributeValueProviders.IConfiguration;
import com.ibm.team.workitem.common.internal.attributeValueProviders.IValueSetProvider;
import com.ibm.team.workitem.common.model.AttributeOperation;
import com.ibm.team.workitem.common.model.IAttribute;
import com.ibm.team.workitem.common.model.IWorkItem;
import com.ibm.team.workitem.common.query.IQueryResult;
import com.ibm.team.workitem.common.query.IResolvedResult;
import com.ibm.team.workitem.service.IQueryServer;

public class SetValueApplicazione extends AbstractService implements IValueSetProvider  {
	private static List summaryList = new ArrayList();
	
	public List getValueSet(IAttribute attribute, IWorkItem workItem, IWorkItemCommon workItemCommon, IConfiguration configuration, IProgressMonitor monitor) throws TeamRepositoryException {
		
		IProjectAreaHandle projectAreaHandle = workItem.getProjectArea();
		IQueryableAttributeFactory queryAttrFactory = QueryableAttributes.getFactory(IWorkItem.ITEM_TYPE);
		IQueryableAttribute type = queryAttrFactory.findAttribute(projectAreaHandle,IWorkItem.TYPE_PROPERTY, workItemCommon.getAuditableCommon(), null);
		AttributeExpression typeExpr = new AttributeExpression(type,AttributeOperation.EQUALS,ProcessProperty.APPLICAZIONE_WI_TYPE);
		IQueryCommon queryService = getService(IQueryCommon.class);
		IQueryResult> results = queryService.getResolvedExpressionResults(projectAreaHandle, typeExpr, IWorkItem.FULL_PROFILE);
		
		if (results.getResultSize(null).getTotal()>0){
			while (results.hasNext(null)) {
				IResolvedResult resolvedResultWI = results.next(null);
				IWorkItem resolvedWi = resolvedResultWI.getItem();
				String resolvedWiSummary = resolvedWi.getHTMLSummary().toString();
				summaryList.add(resolvedWiSummary);
			}
		}
		return summaryList;
	}
}

Then I've manually updated the plugin.xml adding an extensionService with prerequisite:

The getservice does not work and I get this error:

ERROR com.ibm.team.workitem.common - 'com.ibm.team.workitem.valueproviders.VALUE_SET_PROVIDER._fyQ-4DpREeKUUtygZ9ae3g'
java.lang.IllegalArgumentException: The service 'com.ibm.team.workitem.customization.SetValueApplicazione@333c333c' failed to find the required service 'interface com.ibm.team.workitem.common.IQueryCommon'.  Check  in plugin.xml.
	at com.ibm.team.repository.service.AbstractService.getService(AbstractService.java:734)
	at com.ibm.team.workitem.customization.SetValueApplicazione.getValueSet(SetValueApplicazione.java:40)
	at com.ibm.team.workitem.common.internal.attributeValueProviders.AttributeValueProviderRegistry$SafeValueSetProvider.getValueSet(AttributeValueProviderRegistry.java:63)
	at com.ibm.team.workitem.common.internal.model.impl.AttributeImpl.getValueSet(AttributeImpl.java:915)
	at com.ibm.team.workitem.common.internal.model.impl.AttributeImpl.getValueSet(AttributeImpl.java:902)
	at com.ibm.team.workitem.service.internal.rest.ValueSetRestService.getValueSet(ValueSetRestService.java:225)
	at com.ibm.team.workitem.service.internal.rest.ValueSetRestService.getValueSet(ValueSetRestService.java:65)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:618)
	at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.invoke(ExportProxyServiceRecord.java:370)
	at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.access$0(ExportProxyServiceRecord.java:356)
	at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord$ExportedServiceInvocationHandler.invoke(ExportProxyServiceRecord.java:56)
	at $Proxy806.getValueSet(Unknown Source)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:618)
	at com.ibm.team.repository.servlet.AbstractTeamServerServlet.doModelledRestService(AbstractTeamServerServlet.java:504)
	at com.ibm.team.repository.servlet.AbstractTeamServerServlet.handleRequest2(AbstractTeamServerServlet.java:1869)
	at com.ibm.team.repository.servlet.AbstractTeamServerServlet.handleRequest(AbstractTeamServerServlet.java:1725)
	at com.ibm.team.repository.servlet.AbstractTeamServerServlet.service(AbstractTeamServerServlet.java:1634)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at org.eclipse.equinox.http.registry.internal.ServletManager$ServletWrapper.service(ServletManager.java:180)
	at org.eclipse.equinox.http.servlet.internal.ServletRegistration.handleRequest(ServletRegistration.java:90)
	at org.eclipse.equinox.http.servlet.internal.ProxyServlet.processAlias(ProxyServlet.java:111)
	at org.eclipse.equinox.http.servlet.internal.ProxyServlet.service(ProxyServlet.java:75)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at org.eclipse.equinox.servletbridge.BridgeServlet.service(BridgeServlet.java:120)
	at com.ibm.team.repository.server.servletbridge.JazzServlet.service(JazzServlet.java:76)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:563)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
	at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:420)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:879)
	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
	at java.lang.Thread.run(Thread.java:811)

Have someone else try it?
Is it possibile to add an extension service with prerequisites like IQueryCommon to the extension point com.ibm.team.workitem.common.attributeValueProviders ?

Thanks for your time,
Saverio