[jboss-user] [Beginner's Corner] - experimenting with JBoss 7 quickstart helloworld tutorial

[mperdikeas]

mperdikeas [https://community.jboss.org/people/mperdikeas] created the discussion

"experimenting with JBoss 7 quickstart helloworld tutorial"

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I am coming from a Tomcat / JSF background so I did a little experimentation with the quickstart helloworld tutorial.
Specifically I was curious as to the need for the beans.xml file which basically defines namespaces.
Since the first helloworld example does not include any xhtml I thought the file is not needed and so I removed it.
Not surprisingly I received an error when I tried to access the deployed application:

java.lang.NullPointerException
 org.jboss.as.quickstarts.helloworld.HelloWorldServlet.doGet(Unknown Source)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:734)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:847)

What I cannot fathom is how not defining XML namespaces which are not used results in a NullPointerException error.
If anybody can shed some light this will help me improve my mental model and perhaps be able to decipher similarly cryptic messages in the future.
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