[m2t-dev] Run a template from java error

[赵永 <zhao-yong@xxxxxxxxxxx>]

Hi,
 I am using jet to generate code from a xml model.
 I have created a JET transformation project , then coded my own jet template and xml model , then new a JET transformation and run it successfully.

Now, in order to abtain more flexibilities, I want to run the jet template from java. I
have read the JET FAQ "M2T-JET-FAQ/How do I run a JET template from Java?" , 
url:http://wiki.eclipse.org/M2T-JET-FAQ/How_do_I_run_a_JET_template_from_Java%3F

Based on the discription of this faq,  I invoke the JET API in my java class.
First, I create a eclipse plugin project(not jet transformation project),  and config it depends jet plugins
, then code some java class to invoke jet API directly.But I got the following error:

Exception in thread "main" java.lang.NullPointerException
	at org.eclipse.jet.taglib.TagLibraryManager.getTagLibrary(TagLibraryManager.java:89)
	at org.eclipse.jet.internal.runtime.TagFactoryImpl.createRuntimeTag(TagFactoryImpl.java:61)
	at com.neusoft.unieap.dc.jet.domain.DomainMainTemplate.generate(DomainMainTemplate.java:83)
	at test.JETTest.transformation4DO(JETTest.java:30)
	at test.JETTest.main(JETTest.java:19)

I search some information about the error and read a mail ,url:
http://dev.eclipse.org/newslists/news.eclipse.technology.emft/msg01659.html
http://dev.eclipse.org/newslists/news.eclipse.technology.emft/msg01743.html
The response is "Looking at your stack trace, it seems you are trying to run an EMFT JET 
template directly from a Java program (Transform.main()). EMFT JET doesn't 
work that way...."	

Now, I confused:
1 Can I run a run jet template from java? Or from a eclipse plugin project?
2 If it's ok, how to resolve the problem?

Thanks a lot.	
--------------
Frank
2009-08-13

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