[dbforms] On a Roll, Looking for Hints for Troubleshooting

Mon, 05 Apr 2004 21:03:06 -0700 

dbforms tag library installed
DevGui successfully run against my database, saved the dbforms-config.xml and the 
generated table jsp files using dbforms. 

Fired it up, tomcat manager reports successful install of the application. When I put 
in the URL I get a big bad exception. Changing the name of the tag library url proves 
that the tag library is loading.  

I'm pretty new to servlets and jsp. How do you troubleshoot? I don't think I can get 
at file DbFormTag.java?

Gist of error:

exception
org.apache.jasper.JasperException at 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:254) at 
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295) at 
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241) 

<lots of stuff removed>

root cause 

java.lang.NullPointerException
        at org.dbforms.taglib.DbFormTag.setTableName(DbFormTag.java:299)
        at 
org.apache.jsp.accounts_viewTable_jsp._jspService(accounts_viewTable_jsp.java:147)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:210)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
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