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From Martin Gainty <mgai...@hotmail.com>
Subject RE: Struts2 + JPA + JSON - Help with error
Date Fri, 31 Jul 2009 15:03:43 GMT

disable lazy-initialisation in /WEB-INF/applicationContext.xml

<bean id="testDataProvider" class="org.apache.struts2.showcase.application.TestDataProvider"
singleton="true" lazy-init="false"/>

Martin Gainty 
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> To: user@struts.apache.org
> From: nathan.schulte@ngc.com
> Subject: Re: Struts2 + JPA + JSON - Help with error
> Date: Fri, 31 Jul 2009 13:50:14 +0000
> 
> Nathan Schulte <nathan.schulte <at> ngc.com> writes:
> 
> > 
> > Nathan Schulte <nathan.schulte <at> ngc.com> writes:
> > > here, http://article.gmane.org/gmane.comp.jakarta.struts.user/170543,
> > http://article.gmane.org/gmane.comp.jakarta.struts.user/170543
> > 
> > > Here is a link to the error, http://pastebin.com/m5d0d22c8.
> > http://pastebin.com/m5d0d22c8
> > 
> > Also, here is the exception report (of a similar action) given as the HTTP
> > response:
> > http://pastebin.com/m21348ec5
> > 
> 
> I have found a fix for this issue.  As it turns out, because the JSON Plugin is
> using reflection, and the entities the JSON Plugin is reflecting on are using
> Hibernate/JPA "lazy initialization magic", the JSON Plugin was serializing the
> "magic" as well.  This "magic" contains references to underlying JPA
> implementation, which also contains references, which also contain references,
> all the way down past the JDBC layer.  I didn't go as far as to find out what
> was causing this particular error/exception, but simply knew that I don't want
> the Plugin to serialize the hibernateLazyInitializer instances in my entities. 
> The Plugin supports property exclusion via regex, thus the simple fix.
> 
> Hey, perhaps this property exclusion property will come in handy to keep from
> loading the whole database into memory for those self joins I have on my
> entities... :P.
> 
> On another note, although this fixes my particular issue, perhaps there is some
> more elegant solution to help with anything implementing this (or other
> problematic) OOP patterns.
> 
> -Nate
> 
> 
> 
> 
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