i don't know if this help to understand where is the problem but in log file i've:
gen 19, 2016 4:00:40 PM org.apache.catalina.core.ApplicationContext log INFORMAZIONI: Marking servlet cgi as unavailable gen 19, 2016 4:00:40 PM org.apache.catalina.core.StandardContext loadOnStartup GRAVE: Servlet [cgi] in web application [/examples] threw load() exception java.lang.SecurityException: Restricted class org.apache.catalina.servlets.CGIServlet at org.apache.catalina.core.DefaultInstanceManager.checkAccess(DefaultInstanceManager.java:529) at org.apache.catalina.core.DefaultInstanceManager.checkAccess(DefaultInstanceManager.java:520) at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:490) at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:115) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1148) at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1087) at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5327) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5617) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652) at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1263) at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1975) at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) gen 19, 2016 4:00:40 PM org.apache.catalina.core.ApplicationContext log INFORMAZIONI: Marking servlet cgi as unavailable gen 19, 2016 4:00:40 PM org.apache.catalina.core.StandardContext loadOnStartup GRAVE: Servlet [cgi] in web application [] threw load() exception java.lang.SecurityException: Restricted class org.apache.catalina.servlets.CGIServlet at org.apache.catalina.core.DefaultInstanceManager.checkAccess(DefaultInstanceManager.java:529) at org.apache.catalina.core.DefaultInstanceManager.checkAccess(DefaultInstanceManager.java:520) at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:490) at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:115) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1148) at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1087) at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5327) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5617) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652) at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1263) at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1975) at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source)