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I'm trying to run the example in the tutorial on Tomcat, and it can't instantiate the VelocityEngine
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## Tomcat Says

    javax.servlet.ServletException: Servlet.init() for servlet webwork threw exception at
    org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:963)
    ...
    root cause

    java.lang.RuntimeException: Unable to instantiate VelocityEngine\!
    at
    com.opensymphony.webwork.views.velocity.VelocityManager.newVelocityEngine(VelocityManager.java:333)
    at
    com.opensymphony.webwork.views.velocity.VelocityManager.init(VelocityManager.java:146)
    at
    com.opensymphony.webwork.dispatcher.ServletDispatcher.init(ServletDispatcher.java:177)
    at
    org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:935)

## Solution

(Thanks to Keith Lea!)

It turns out Velocity's Avalon logging system was trying to write to my Tomcat folder.

So that it's on file somewhere for other people, I will describe the solution:

- I created a file "`velocity.properties`" and placed it in my `WEB-INF/classes` folder.
- Inside the file I wrote:

    runtime.log.logsystem.class=org.apache.velocity.runtime.log.NullLogSystem

This stops Velocity from logging, and the example application now works.