Connecting to SSRS 2008 from Java - Is a .jar file required?

I am trying to connect to SSRS using a web service proxy and I cannot seem to get the correct signature for the Render class/method. I was able to get the getReport Parameters to work fine by calling:

ReportingService2005Soap port = (ReportingService2005Soap)obj.getLogicalPort(

"ReportingService2005Soap", com.harlandclarke.ssrsproxy.ReportService2005.ReportingService2005.class);

 ReportParameter param[] = port.getReportParameters(

"/Company Sales 2008", null, false, null, null);

but the same is not true when I try

ReportExecutionServiceSoap exec_port = (ReportExecutionServiceSoap)exec.getLogicalPort(

"ReportExecutionServhhhiceSoap", ReportExecutionService.class);

exec_port.render(       //in here I have to choose Render

I noticed that everyone seems to be instantiating ReporExecutionService

Is there a jar file I need to import and if so where/how do I get it.

I have been able in c# to get the correct signature for the Render class and I am not sure why it would be different there.

Thanks