After setting up environment for developing web services, creating simple Demo service and deploying it, console gave out the following message:

delegate: false
repositories:
/WEB-INF/classes/
----------> Parent Classloader:
org.apache.catalina.loader.StandardClassLoader@337838
org.apache.axis2.transport.http.AxisAdminServlet
java.lang.ClassNotFoundException: org.apache.axis2.transport.http.AxisAdminServlet
...

The cause is that current WTP doesn't support Axis2 1.5 version. Currently it supports only 1.4.1 (see this discussion).