贴个问题日志，具体什么问题，麻烦高手给指点下，谢谢！！

Question

Struts ValueStack Debug                                                                                                  
                                                                                                                         
Value Stack Contents                                                                                                     
Object Property Name Property Value                                                                                      
com.opensymphony.xwork2.interceptor.ExceptionHolder exceptionStack java.lang.NullPointerException at whg.action.AddBullet
exception java.lang.NullPointerException                                                                                 
whg.action.AddBulletinAction texts null                                                                                  
errorMessages []                                                                                                         
locale zh_CN                                                                                                             
actionMessages []                                                                                                        
mgr There is no read method for mgr                                                                                      
authid 123                                                                                                               
content 345                                                                                                              
title 34                                                                                                                 
actionErrors []                                                                                                          
errors {}                                                                                                                
fieldErrors {}                                                                                                           
bulletin null                                                                                                            
bulletindao null                                                                                                         
appendix 234                                                                                                             
com.opensymphony.xwork2.DefaultTextProvider texts null                                                                   
                                                                                                                         
                                                                                                                         
Stack Context                                                                                                            
These items are available using the #key notation Key Value                                                              
com.opensymphony.xwork2.dispatcher.HttpServletRequest org.apache.struts2.dispatcher.StrutsRequestWrapper@1e6271c         
com.opensymphony.xwork2.ActionContext.locale zh_CN                                                                       
com.opensymphony.xwork2.dispatcher.HttpServletResponse org.apache.catalina.connector.ResponseFacade@39436                
com.opensymphony.xwork2.ActionContext.name addbulletin                                                                   
com.opensymphony.xwork2.ActionContext.application {com.sun.faces.config.WebConfiguration=com.sun.faces.config.WebConfigur
com.opensymphony.xwork2.ActionContext.conversionErrors {}                                                                
__component_stack [org.apache.struts2.components.Debug@1d65613]                                                          
last.property.accessed null                                                                                              
com.opensymphony.xwork2.dispatcher.ServletContext org.apache.catalina.core.ApplicationContextFacade@85bf5f               
com.opensymphony.xwork2.dispatcher.PageContext org.apache.jasper.runtime.PageContextImpl@156dc34                         
__requestWrapper.getAttribute false                                                                                      
request {struts.request_uri=/whg_test/addbulletin.action, javax.servlet.forward.servlet_path=/addbulletin.action, javax.s
last.bean.accessed null                                                                                                  
action whg.action.AddBulletinAction@474b34                                                                               
parameters {content=[Ljava.lang.String;@9a4938, title=[Ljava.lang.String;@13d0a33, appendix=[Ljava.lang.String;@68c5fd, a
__link [Ljava.lang.Object;@14e61f7                                                                                       
application {com.sun.faces.config.WebConfiguration=com.sun.faces.config.WebConfiguration@a04bfe, freeer.Configuration
xwork.NullHandler.createNullObjects false                                                                                
current.property.path null                                                                                               
attr org.apache.struts2.util.AttributeMap@1bbe870                                                                        
com.opensymphony.xwork2.ActionContext.container com.opensymphony.xwork2.inject.ContainerImpl@dafc3                       
com.opensymphony.xwork2.ActionContext.session {userid=342224197902151232}                                                
com.opensymphony.xwork2.ActionContext.actionInvocation com.opensymphony.xwork2.DefaultActionInvocation@982611            
com.opensymphony.xwork2.util.ValueStack.ValueStack com.opensymphony.xwork2.ognl.OgnlValueStack@182bd03                   
session {userid=342224197902151232}                                                                                      
report.conversion.errors false                                                                                           
xwork.MethodAccessor.denyMethodExecution false                                                                           
struts.actionMapping org.apache.struts2.dispatcher.mapper.ActionMapping@2b17b5                                           
com.opensymphony.xwork2.ActionContext.parameters {appendix=[Ljava.lang.String;@68c5fd, authid=[Ljava.lang.String;@9e7296,

Answer 1

exception java.lang.NullPointerException
whg.action.AddBulletinAction texts null   
mgr There is no read method for mgr

Answer 2

多谢，先搞这个 exception java.lang.NullPointerException
我 在网上查了，说是 用 断点调试 可以发现 具体原因，我试试。