Struts contention on WebCtxLoader

Issue

• We use struts and see heavy thread contention on a WebCtxLoader$ENCLoader, for example:

"ajp-10.207.30.181-8009-408" daemon prio=10 tid=0x00002aaabc048800 nid=0xd96 waiting for monitor entry [0x00000000732c8000]
   java.lang.Thread.State: BLOCKED (on object monitor)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:291)
    - waiting to lock <0x000000070d46dee8> (a org.jboss.web.tomcat.service.WebCtxLoader$ENCLoader)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at org.apache.struts.util.RequestUtils.applicationClass(RequestUtils.java:117)
    at org.apache.struts.util.RequestUtils.canReuseActionForm(RequestUtils.java:248)
    at org.apache.struts.util.RequestUtils.createActionForm(RequestUtils.java:183)
    at org.apache.struts.action.RequestProcessor.processActionForm(RequestProcessor.java:331)
    at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:202)
    at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
    at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)