Service Group Problems with Apache Axis2

Recently, I am doing web services programming with Apache Axis2. I perform several builds with the target stock.aar (every time, the content of services.xml is different). The deployment are successfully all the times. However, when I try to access the web service using a client, I receive the following error:

... StockQuoteService_Jack2, which is invalid. It does not belong to the stock service group ...

To my understanding, a service group is a .aar file - all the web services contained in the .aar belong to the same service group and the group name is the file name without extension.

To solve the problem, I restart my Tomcat. It seems that the problem was caused due some caching problems of Axis2.