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

Tue Jun 21 11:12:58 PDT 2011

well, you really want

decl(title, body) ::= ...

right? ;)

no errors other than NPE?
T
On Jun 21, 2011, at 10:35 AM, Daniel Brenner wrote:

> hi Ter,
> 
> tried it. Now, "decl.st" looks like
> 
> t(args) ::= <<
> <html>
> <head>
> <title>$title$</title>
> </head>
> <body>
> <h1>$title$</h1>
> </body>
> </html>
>>> 
> 
> and it still keeps giving me the NPE.
> 
> Cheers,
> 
> - Daniel
> 
> 
> 
> 	-----Ursprüngliche Nachricht-----
> 	Von: Terence Parr mailto:parrt at cs.usfca.edu
> 	Gesendet: 21.06.2011 19:28:10
> 	An: Daniel Brenner mailto:daniel.brenner at cas.de
> 	Cc:  mailto:stringtemplate-interest at antlr.org
> 	Betreff: [RE:] Re: [stringtemplate-interest] NullPointerException from stgroup.getInstance()
> 
> 	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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> 
> 
> 
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