Re: Loading templates from classpath ( ClassTemplateLoader problem or /dev/hands ? )

Since people use ClassTemplateLoader for ages to load templates from jar-s,
I suspect the problem is elsewhere. Looking at your example:


   ClassTemplateLoader ctl = new FixedClassTemplateLoader(getClass(), "templates");
   ...
   Template template = cfg.getTemplate("templates/testEmailTemplate.ftl");

In the first line you establish that the template root directory is
"templates", yet in the last line you write
"templates/testEmailTemplate.ftl", not "testEmailTemplate.ftl". With
ClassTemplateLoader that would mean that the final classpath-resource
path is "templates/templates/testEmailTemplate.ftl". But your template
loader ignores the base path, so I suppose, that's why it works. What
you had to do is either using cfg.getTemplate("testEmailTemplate.ftl")
or using new ClassTemplateLoader(getClass(), ""). Is possible that
this is the solution?

-- 
Best regards,
 Daniel Dekany


Friday, February 22, 2013, 6:47:51 AM, akuntamukkala wrote:

> Daniel
> Thanks for taking time to respond.
>
> The problem I was having is that the
> "templates/testEmailTemplate.ftl" which is in a jar file wasn't
> getting loaded when I used ClassTemplateLoader.  
>
> log4j:WARN No appenders could be found for logger (freemarker.cache).
> log4j:WARN Please initialize the log4j system properly.
> Exception in thread "main" java.io.FileNotFoundException: Template testEmailTemplate.ftl not found.
>         at
> freemarker.template.Configuration.getTemplate(Configuration.java:489)
>         at
> freemarker.template.Configuration.getTemplate(Configuration.java:452)
>
> Upon digging up ClassTemplateLoader {free marker v2.3.9} source, I
> found getUrl() to be defined as follows. 
>     protected URL getURL(String name)
>     {
>         return loaderClass.getResource(path + name);
>     }
>
> It seems valid. However this wasn't loading the .ftl file from
> templates folder. I explicitly initialized ClassLoader as shown the
> code in the previous email and it worked. 
>
> I understand the intent of this class but wasn't able to make it
> work for me so I used that class loader to load the resource.
>
>
> Thank you,
> Ashwin 
>
>
>
>
> *****This e-mail and replies and forwards are for the sole use of
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>
>
> From: "Daniel Dekany [via FreeMarker]" <[hidden email]>
> Date: Thursday, February 21, 2013 6:20 PM
> To: Ashwini Kuntamukkala <[hidden email]>
> Subject: Re: Loading templates from classpath ( ClassTemplateLoader problem or /dev/hands ? )
>
> Thursday, February 21, 2013, 7:32:01 PM, akuntamukkala wrote: 
>
>> Here is what I did to get around this problem with ClassTemplateLoader 
>> 
>> The issue is that the proper class loader isn't being used. I got around 
>> this by subclassing ClassTemplateLoader 
>> 
>> public class FixedClassTemplateLoader extends ClassTemplateLoader { 
>> 
>>         private ClassLoader classLoader; 
>>         public FixedClassTemplateLoader(Class clazz, String string) { 
>>                 super(clazz, string); 
>>                 classLoader = clazz.getClassLoader(); 
>>         } 
>>         @Override 
>>         protected URL getURL(String name) { 
>>                 // this now loads the template file from the jar 
>>                 return classLoader.getResource(name); 
>>         }       
>> } 
> So, what exactly does this fix and how? As far as I see, 
> ClassTemplateLoader already uses the defining class-loader of the 
> `clazz` constructor argument, so there's no change here. Or is there? 
>
> BTW, the other change is that you ignore the 2nd constructor parameter
> (the base path) in the getURL method for some reason, although if you 
> really don't want a base path, you could just use "" for it as the 
> constructor argument. 


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