Ensure availability of Toolkit website

[vaadin-bot]

Originally by Jani Laakso

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Add rudimentary tools to log

• latency (between client-server)
• resource (=memory) consumption
• errors

Helps us to prevent situation where

• website does DOS
• demos throw errors

By adjusting hardware / JDK parameters.

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Imported from https://dev.vaadin.com/ issue #325

[vaadin-bot]

Originally by Jani Laakso

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Postponing milestone, release can be signoffed without this ticket.

[vaadin-bot]

Originally by Jani Laakso

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Add

• service that emails admins if index.html OR FeatureBrowser stops responding

[vaadin-bot]

Originally by Jani Laakso

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Enhanced FeatureBrowser logging and system resource reporting.

• memory resources are written to console
• better error catching and reporting to console
• minor navigation statistics added, logged to console

ISSUES

• latency not resolved, should be inspected on Apache / Tomcat side
• need to add "links" script that ensures FeatureBrowser answers
• report to email if demo fails

[vaadin-bot]

Originally by Jani Laakso

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Here's an example of statistics, error reporting (forced exception) and system status collection:

------------------ License Info -----------------------
License number: 1
Product: IT Mill Toolkit
Version: major version = 4
Use is limited to: Development and testing only, production use is forbidden
-------------------------------------------------------
timestamp=Wed Mar 14 16:34:28 EET 2007 free=39932480, total=56229888, max=504889344
[1173882496033] timestamp=[20070314 162817] userAgent=[Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.2) Gecko/20060601 Firefox/2.0.0.2 (Ubuntu-edgy)]
[1173882496033] valueChange tree, /UI Components/Basic/Label
[1173882496033] buttonClick button, Show properties, true
[1173882496033] buttonClick button, Show properties, false
[1173882496033] valueChange tree, /UI Components/Basic/Link
[1173882496033] valueChange tree, /UI Components/Layouts/Ordered Layout
[1173882496033] valueChange tree, /UI Components/Layouts/Tab Sheet
[1173882496033] valueChange tree, /UI Components/Item Containers/Tree
[1173882496033] terminalError: java.lang.NullPointerException
java.lang.NullPointerException
	at com.itmill.toolkit.demo.features.FeatureTree.handleAction(FeatureTree.java:182)
	at com.itmill.toolkit.ui.Tree.changeVariables(Tree.java:293)
	at com.itmill.toolkit.terminal.web.AjaxVariableMap.handleVariables(AjaxVariableMap.java:575)
	at com.itmill.toolkit.terminal.web.AjaxApplicationManager.handleUidlRequest(AjaxApplicationManager.java:137)
	at com.itmill.toolkit.terminal.web.ApplicationServlet.service(ApplicationServlet.java:550)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
	at java.lang.Thread.run(Thread.java:619)

[vaadin-bot]

Originally by Jani Laakso

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Toolkit demo parts fixed, see #903