null exception on invoke, tapestry 3.0.3 - HELP!! (source)

[Andreas Pardeike <an...@pardeike.net>]

Seems like the attachments didn't make it. Here's the source:


### DBTextSnippet.jwc

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE component-specification PUBLIC
   "-//Apache Software Foundation//Tapestry Specification 3.0//EN"
   "http://jakarta.apache.org/tapestry/dtd/Tapestry_3_0.dtd">
<!-- generated by Spindle, http://spindle.sourceforge.net -->
<component-specification  
class="se.pardeike.tapestry.Extras.DBTextSnippet.DBTextSnippet"
   allow-body="no" allow-informal-parameters="no">
   <description>A piece of dynamic text fetched from a database</ 
description>
   <parameter name="textid" type="java.lang.String" property- 
name="snippetID" direction="in" required="yes">
     <description>ID of the text snippet</description>
   </parameter>
   <parameter name="textloc" type="java.util.Locale" property- 
name="snippetLocale" direction="in" required="yes">
     <description>Locale of the text snippet</description>
   </parameter>
</component-specification>


### DBTextSnippet.java

package se.pardeike.tapestry.Extras.DBTextSnippet;

import java.lang.reflect.Method;
import java.util.Locale;

import org.apache.tapestry.AbstractComponent;
import org.apache.tapestry.IMarkupWriter;
import org.apache.tapestry.IPage;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.PageRedirectException;

public abstract class DBTextSnippet extends AbstractComponent
{
   private static String snippetGetter = "getSnippetText";
   private static Method snippetGetterMethod;
   private static String snippetConverter = "TextEditSnippet2HTML";
   private static Method snippetConverterMethod;
   private static boolean hasSnippetConverter = true;

   public abstract void setSnippetID(String newID);
   public abstract String getSnippetID();

   public abstract void setSnippetLocale(Locale newLocale);
   public abstract Locale getSnippetLocale();

   protected void renderComponent(IMarkupWriter writer, IRequestCycle  
cycle)
   {
     IPage page = cycle.getPage();
     Object visitObject = page.getVisit();
     if(visitObject == null)
     {
       System.out.println("No visit object so far. Restarting page.");
       throw new PageRedirectException(page);
     }

     Class visitClass = visitObject.getClass();
     Object[] arguments = null;
     try
     {
       Class[] parameterTypes = new Class[] {String.class,  
Locale.class};
       arguments = new Object[] {getSnippetID(), getSnippetLocale()};
       if(snippetGetterMethod == null)
         snippetGetterMethod = visitClass.getMethod(snippetGetter,  
parameterTypes);
       String txt = (String)snippetGetterMethod.invoke(visitObject,  
arguments);
       if(txt != null)
       {
         if(hasSnippetConverter)
         {
           parameterTypes = new Class[] {String.class};
           arguments = new Object[] {txt};
           if(snippetConverterMethod == null)
           {
             Method[] methods = visitClass.getMethods();
             for(int i = 0; i < methods.length; i++)
               if(methods[i].getName().equals(snippetConverter))
               {
                 snippetConverterMethod = visitClass.getMethod 
(snippetConverter, parameterTypes);
                 break;
               }
             if(snippetConverterMethod == null)
               hasSnippetConverter = false;
           }
           if(snippetConverterMethod != null)
             txt = (String)snippetConverterMethod.invoke(visitObject,  
arguments);
         }
         writer.printRaw(txt);
       }
       else
         writer.print("[" + getSnippetID() + "/" + getSnippetLocale()  
+ " not found]");
     }
     catch(Exception e)
     {
       writer.print("page: " + page);
       writer.print("visitObject: " + visitObject);
       writer.print("visitClass: " + visitClass);
       writer.print("arguments[0]: " + arguments[0]);
       writer.print("arguments[1]: " + arguments[1]);
       writer.print("snippetGetterMethod: " + snippetGetterMethod);
       writer.printRaw("<hr>");

       writer.print("Component exception : " + e.getMessage());
       writer.printRaw("<hr>");
       StackTraceElement[] st = e.getStackTrace();
       for(int i = 0; i < st.length; i++)
       {
         writer.print(st[i].toString());
         writer.printRaw("<br>");
       }
     }
   }
}


### and inside the visit object, getSnippetText is defined as:

// called by component TextEdit to fetch txt from db
public String getSnippetText(String id, Locale locale)
{
   String localeStr = locale.getLanguage()+','+locale.getCountry();
   Texter snippet = textForID(id, localeStr, true);
   if(snippet != null)
     return snippet.getSnippetText().trim();
   return null;
}

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