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

Tue Jun 21 10:35:32 PDT 2011

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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