RE: [HAPI-devel] SystemClassLoader and Tomcat Enviroment

[Tripp, B. <Bry...@uh...>]

Thanks for pointing this out.  This had actually been reported before, and I
have a note that I had fixed it, but it wasn't fixed.  I'm not sure what
happened there ... possibly I made some CVS-related mistake.  

Bryan 

> -----Original Message-----
> From: Pier Francesco Sormani [mailto:p.s...@we...]
> Sent: March 2, 2004 5:47 AM
> To: hl7...@li...
> Subject: [HAPI-devel] SystemClassLoader and Tomcat Enviroment
> 
> 
> Hello
> 
> I tried to run the HAPI under Tomcat enviroment (tomcat 
> 4.1.27) but I found
> the following problem:
> 
> ca.uhn.hl7v2.HL7Exception: Couldn't create Message object of 
> type ADT_A08
>  at ca.uhn.hl7v2.parser.PipeParser.parse(PipeParser.java:222)
>  at ca.uhn.hl7v2.app.Responder.processMessage(Responder.java:139)
>  at ca.uhn.hl7v2.app.Receiver$Grunt.run(Receiver.java:115)
> Caused by: ca.uhn.hl7v2.HL7Exception: No map found for version 2.3.1
>  at 
> ca.uhn.hl7v2.parser.Parser.getMessageStructureForEvent(Parser.
> java:390)
>  at ca.uhn.hl7v2.parser.Parser.findMessageClass(Parser.java:263)
>  at ca.uhn.hl7v2.parser.PipeParser.parse(PipeParser.java:209)
>  ... 2 more
> 
> The problem was about the SystemClassLoader. Tomcat, such as 
> many server
> applications,
> installs a variety of class loaders.
> When you deploy a resource (like properties files) under a 
> WebApp, you must
> use the
> getResourceAsStream() instead of getSystemResourceAsStream() 
> to retrieve
> this rosource.
> 
> So I have changed:
>     InputStream in =
> Parser.class.getClassLoader().getSystemResourceAsStream(resource);
> in
>     InputStream in =
> Parser.class.getClassLoader().getResourceAsStream(resource);
> 
> in the loadMessageStructures() method of Parser class and all 
> seems to be
> ok.
> 
> Is it a bug? this is a valid solution?
> 
> More information can be found at:
> http://jakarta.apache.org/tomcat/tomcat-4.1-doc/class-loader-h
owto.html

Hi, Piero.
--------------------------------------
Dott. Pier Francesco Sormani
Synapsis S.r.l.
     in Computer Science

P.zza Dante, 19/20
57121 Livorno
Phone: +39 0586 426790
fax: +39 0586 443954
www.websynapsis.com
--------------------------------------




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