JBoss does't unload web services classes

We have an application that comunicate with a webservice (Federal Government of Brazil) constantly, step by 5 or 10 seconds.

We have created web service consumer classes by using the following command point to the WSDL file:

wsconsume -k -p br.com.compliancefiscal.nfe.ejb.sefaz.ws.nfestatusservico -v NfeStatusServico.wsdl

This tool, was generated this classes:

NfeStatusServico.java
NfeStatusServico_Service.java
NfeStatusServicoNF.java
NfeStatusServicoNFResponse.java
NfeStatusServicoSoap.java
ObjectFactory.java
package-info.java

The problem is. When running... every call this webservice generate a new loadclass. Viewing in the JConsole tool, we can note that whe app starts it have aproximatelly 15000 classes loaded, and afeter 10 hours running we can se that the jvm has increased up to 70000 classes loaded, and only 252 classes unloaded.

I have the screenshot that show this.

What can occours to causing this BIG load classes for same class ?

PS: The app does not run any other service. It just start a method that connect to the specified webservice and return a String info. A TimerService trigger start the process steb by 5 seconds.

Thanks.

Edson Gonçalez.