while executing a small application in Eclipse, I get an Http Status 500 error from the Tomcat server that I am running through Eclipse itself...

HTTP Status 500 -   

--------------------------------------------------------------------------------  

type Exception report  

message   

description The server encountered an internal error () that prevented it from fulfilling this request.  

exception   

java.lang.NullPointerException  
    org.apache.struts2.impl.StrutsActionProxy.getErrorMessage   (StrutsActionProxy.java:69)  
    com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:185)  
    org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)  
    org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)  
    com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)  
    org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:500)  
    org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:434)  


 note The full stack trace of the root cause is available in the Apache Tomcat/7.0.8 logs. 

This message from the server says that error was caused by a "NullPointerException". The last line says that "full stack trace is available in Apache Tomcat/7.0.8 logs. I have checked the logs created in my workspace ( ${catalina.base} is set to a folder in my workspace) but the logs don't provide any details about the "NullPointerException". The only thing present in the logs is...

0:0:0:0:0:0:0:1 - - [03/May/2012:15:19:16 +0530] "GET /KurniawanChap02Struts/ HTTP/1.1" 500 1789

I have also tried increasing the "logging levels" but even that doesn't help. What should I do to access the detailed logs of the server ?