Issue 1: Drop webwork-example.war into Tomcat. Go to /webwork-example/. Stack Trace displayed:

java.lang.RuntimeException: Fallback must be an instance of DefaultConfigurationManager
at com.opensymphony.xwork.interceptor.component.DefaultComponentManager.setFallback(DefaultComponentManager.java:50)
at com.opensymphony.webwork.lifecycle.RequestLifecycleFilter.doFilter(RequestLifecycleFilter.java:54)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
....

Checking the log shows: Session event listener threw exception
java.lang.NoClassDefFoundError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:140)
at com.opensymphony.xwork.interceptor.component.ComponentConfiguration.loadClass(ComponentConfiguration.java:133)
at com.opensymphony.xwork.interceptor.component.ComponentConfiguration.configure(ComponentConfiguration.java:64)
at com.opensymphony.webwork.lifecycle.SessionLifecycleListener.sessionCreated(SessionLifecycleListener.java:50)
at org.apache.catalina.session.StandardSession.tellNew(StandardSession.java:402)
...

Commenting everthing out of components.xml fixes that issue.

In that configuration, the following links on the example page throw execptions. All threw ServletException (with non-useful stacktraces) unless noted:

/webwork-example/SimpleCounter.action
/webwork-example/VelocityCounter.action
/webwork-example/action.jsp
/webwork-example/bean.jsp
/webwork-example/TagTest.action
/webwork-example/VelocityTagTest.action
/webwork-example/tags.vm (this was an IOException: java.io.IOException: unable to render tag! --
org.apache.velocity.exception.MethodInvocationException: Invocation of method 'findValue' in class com.opensymphony.xwork.util.OgnlValueStack threw exception class java.lang.NullPointerException : null)
/webwork-example/CountryTest.action
/webwork-example/IteratorTest.action
/webwork-example/showForm.action
/webwork-example/exception.action

The link /webwork-example/form2.jsp worked, but pressing the button created another stacktrace.