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java.security.AccessControlException: access denied
(java.lang.RuntimePermission modifyThreadGroup)	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$CustomSecurityManager.checkPermission(DevAppServerFactory.java:122)	at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkAccess(DevAppServerFactory.java:149)	at java.lang.ThreadGroup.checkAccess(ThreadGroup.java:288)	at java.lang.Thread.init(Thread.java:332)	at java.lang.Thread.(Thread.java:377)	at java.util.TimerThread.(Timer.java:456)	at java.util.Timer.(Timer.java:71)	at java.util.Timer.(Timer.java:122)	at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:208)	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:282)	at java.sql.DriverManager.getConnection(DriverManager.java:582)	at java.sql.DriverManager.getConnection(DriverManager.java:185)	at faceRecognition.server.AuthServiceImpl.doAuthenticate(AuthServiceImpl.java:37)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:527)	at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:166)	at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:86)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)	at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)	at com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:54)	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)	at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:306)	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)	at org.mortbay.jetty.Server.handle(Server.java:313)	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:506)	at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:844)	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:205)	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:396)	at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)