> Hello, I'm studying the security with your book. Your book is good to 
learn
about java security. But I faced some problem while I was executing your
code on chapter 11.  Https works well. But I have Servlet Error. I tried to
test servlet example at https://localthost:8443 and there is no problem.
Could you tell me the hint to solve this problem? Please let me know it.
I'm looking forward your reply.


https://localhost:8443/registerServlet

Error: 500
Location: /registerServlet
Internal Servlet Error:

java.lang.NullPointerException
	at
ecommerce_example.servlet.RegisterServlet.doPost(RegisterServlet.java:26)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:772)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
	at
org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
	at org.apache.tomcat.core.Handler.service(Handler.java:286)
	at org.apache.tomcat.core.ServletWrapper.service
(ServletWrapper.java:372)
	at
org.apache.tomcat.core.ContextManager.internalService
(ContextManager.java:797)


	at org.apache.tomcat.core.ContextManager.service
(ContextManager.java:743)
	at
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection
(HttpConnectionHandler.java:210)


	at
org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
	at
org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
	at java.lang.Thread.run(Thread.java:484)


Hello,

Specific book support issues should be sent to support@w...  I would 
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