Tomcat WARN log during server startup

[jsdjayanga]

Refer https://wso2.org/jira/browse/CARBON-15282

[senthalan]

When changing changing the servlet registeration url from
httpService.registerServlet("/", new org.apache.tiles.web.startup.TilesServlet(), initparams, commonContext);
to

httpService.registerServlet("", new org.apache.tiles.web.startup.TilesServlet(), initparams, commonContext);

This WARN got fixed but got the following ERROR from the equinox.http.servlet and the management console also not working. So this is due to the uncompatibility with the equinox.http.servlet and tomcat

[2019-08-30 12:01:45,621] [] ERROR {org.wso2.carbon.ui.internal.CarbonUIServiceComponent} - Failed to activate Carbon UI bundle java.lang.IllegalArgumentException: Invalid alias ''
	at org.eclipse.equinox.http.servlet.internal.ProxyServlet.checkAlias(ProxyServlet.java:218)
	at org.eclipse.equinox.http.servlet.internal.ProxyServlet.registerServlet(ProxyServlet.java:167)
	at org.eclipse.equinox.http.servlet.internal.HttpServiceImpl.registerServlet(HttpServiceImpl.java:66)
	at org.wso2.carbon.ui.internal.CarbonUIServiceComponent.start(CarbonUIServiceComponent.java:293)
	at org.wso2.carbon.ui.internal.CarbonUIServiceComponent.activate(CarbonUIServiceComponent.java:121)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.eclipse.equinox.internal.ds.model.ServiceComponent.activate(ServiceComponent.java:260)
	at org.eclipse.equinox.internal.ds.model.ServiceComponentProp.activate(ServiceComponentProp.java:146)
	at org.eclipse.equinox.internal.ds.model.ServiceComponentProp.build(ServiceComponentProp.java:345)
	at org.eclipse.equinox.internal.ds.InstanceProcess.buildComponent(InstanceProcess.java:620)
	at org.eclipse.equinox.internal.ds.InstanceProcess.buildComponents(InstanceProcess.java:197)
	at org.eclipse.equinox.internal.ds.Resolver.getEligible(Resolver.java:343)
	at org.eclipse.equinox.internal.ds.SCRManager.serviceChanged(SCRManager.java:222)
	at org.eclipse.osgi.internal.serviceregistry.FilteredServiceListener.serviceChanged(FilteredServiceListener.java:113)
	at org.eclipse.osgi.internal.framework.BundleContextImpl.dispatchEvent(BundleContextImpl.java:985)
	at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:234)
	at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:151)
	at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEventPrivileged(ServiceRegistry.java:866)
	at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEvent(ServiceRegistry.java:804)
	at org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.register(ServiceRegistrationImpl.java:130)
	at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.registerService(ServiceRegistry.java:228)
	at org.eclipse.osgi.internal.framework.BundleContextImpl.registerService(BundleContextImpl.java:525)
	at org.eclipse.osgi.internal.framework.BundleContextImpl.registerService(BundleContextImpl.java:544)
	at org.wso2.carbon.core.init.CarbonServerManager.initializeCarbon(CarbonServerManager.java:529)
	at org.wso2.carbon.core.init.CarbonServerManager.removePendingItem(CarbonServerManager.java:305)
	at org.wso2.carbon.core.init.PreAxis2ConfigItemListener.bundleChanged(PreAxis2ConfigItemListener.java:118)
	at org.eclipse.osgi.internal.framework.BundleContextImpl.dispatchEvent(BundleContextImpl.java:973)
	at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:234)
	at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:345)