[stringtemplate-interest] NullPointerException from stgroup.getInstance()

Tue Jun 21 09:57:33 PDT 2011

hi. do you have a header in each .st file?  I might make a backward compat thing but you need a formal header for now

t(args) ::= <<
template
>>

T
On Jun 21, 2011, at 4:51 AM, Daniel Brenner wrote:

> Hi everybody,
> 
> after a long time I want to use stringtemplate in one of my projects againg. I worked with stringtemplate v2 and the early versions of 3. However, it seems that I cannot get v4 working.
> 
> This is my scenario:
> In the folder "content/" there is the template file "decl.st" containing a very easy HTML page
> 
> <html>
> <head>
> <title>$title$</title>
> </head>
> <body>
> <h1>$title$</h1>
> </body>
> </html>
> 
> 
> The source code with stringtemplate v3 is this
> 
> StringTemplateGroup group = new StringTemplateGroup(null, "content/", DefaultTemplateLexer.class);
> StringTemplate template = group.getInstanceOf("decl");
> template.setAttribute("title", "Hello World");
> 
> And it works perfectly fine.
> 
> The equivalent in stringtemplate v4 (4.0.2) is - from what I figured and please correct me if I am wrong - 
> 
> STGroup group = new STGroupDir("content", '$', '$');
> ST template = group.getInstanceOf("decl");	
> template.add("title", "Hello World");
> 
> Now when I run this, I am seeing a NullPointerException:
> 
> Exception in thread "main" java.lang.NullPointerException
> 	at org.stringtemplate.v4.STGroup.loadTemplateFile(STGroup.java:624)
> 	at org.stringtemplate.v4.STGroupDir.loadTemplateFile(STGroupDir.java:165)
> 	at org.stringtemplate.v4.STGroupDir.load(STGroupDir.java:127)
> 	at org.stringtemplate.v4.STGroup.lookupTemplate(STGroup.java:226)
> 	at org.stringtemplate.v4.STGroup.getInstanceOf(STGroup.java:160)
> 	at Fancy.main(Fancy.java:15)
> 
> Also with stringtemplate v4.0.3 I am seeing the NPE.
> 
> What did I do wrong? I want to use v4 because of its cool new feature.
> 
> Alongside with the NullPointerException I get the following output in my eclipse console:
> 
> decl.st 1:1: invalid character '<'
> decl.st 1:5: invalid character '>'
> decl.st 2:1: invalid character '<'
> decl.st 1:1: no viable alternative at input 'html'
> decl.st 2:5: invalid character '>'
> decl.st 3:1: invalid character '<'
> decl.st 3:6: invalid character '>'
> decl.st 3:7: invalid character '$'
> decl.st 3:13: invalid character '$'
> decl.st 3:15: invalid character '<'
> decl.st 3:16: invalid character '/'
> decl.st 3:21: invalid character '>'
> decl.st 4:1: invalid character '<'
> decl.st 4:2: invalid character '/'
> decl.st 4:6: invalid character '>'
> decl.st 5:1: invalid character '<'
> decl.st 5:5: invalid character '>'
> decl.st 6:1: invalid character '<'
> decl.st 6:3: invalid character '>'
> decl.st 6:4: invalid character '$'
> decl.st 6:10: invalid character '$'
> decl.st 6:12: invalid character '<'
> decl.st 6:13: invalid character '/'
> decl.st 6:15: invalid character '>'
> decl.st 7:1: invalid character '<'
> decl.st 7:2: invalid character '/'
> decl.st 7:6: invalid character '>'
> decl.st 8:1: invalid character '<'
> decl.st 8:2: invalid character '/'
> decl.st 8:6: invalid character '>'
> 
> What is this all about?
> 
> Thanks in advance and cheers,
> 
> - Daniel
> 
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