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access denied (java.lang.RuntimePermission modifyThreadGroup)
java.security.AccessControlException: access denied(java.lang.RuntimePermission modifyThread) at java.security.AccessControlContext.checkPermission(AccessControlContext.java:323) at java.security.AccessController.checkPermission(AccessController.java:546) at java.lang.SecurityManager.checkPermission(SecurityManager.java:532) at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkPermission(DevAppServerFactory.java:166) at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkAccess(DevAppServerFactory.java:203) at java.lang.Thread.checkAccess(Thread.java:1287) at java.lang.Thread.setName(Thread.java:1068) at net.sf.ehcache.constructs.web.filter.CachingFilter.buildPageInfo(CachingFilter.java:240) at net.sf.ehcache.constructs.web.filter.CachingFilter.doFilter(CachingFilter.java:185) at net.sf.ehcache.constructs.web.filter.Filter.doFilter(Filter.java:86)