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Gemini Web with Hibernate [message #889444]

Tue, 19 June 2012 04:36

Thorsten Schlathölter is currently offline

Thorsten Schlathölter
Messages: 179
Registered: February 2012
Location: Düsseldorf

Senior Member

Hi,
I just want to share my experience with gemini web in conjunction with spring/hibernate. I tried to configure hibernate using spring.orm and I had a lot of problems with it. First of all I start with an existing mapping layer with old style .hbm.xml mapping files (so no annotations).

In detail I tried the following:

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="dataSource" ref="myDataSource"/>
    <property name="mappingDirectoryLocations">
    	<list>
   	  <value>classpath:/root/domain/pkg</value>
	</list>
    </property>
</bean>

With the following result:

Caused by: java.io.FileNotFoundException: OSGi resource[classpath:/root/domain/pkg/|bnd.id=46|bnd.sym=GeminiServerPlugin] cannot be resolved to absolute file path because it does not reside in the file system: bundleresource://46.fwk24463001/root/domain/pkg/
	at org.springframework.util.ResourceUtils.getFile(ResourceUtils.java:242)
	at org.springframework.osgi.io.OsgiBundleResource.getFile(OsgiBundleResource.java:342)

I did some debugging. This fails because ResourceUtils.getFile() expects a file scheme in the provided url. But the way the directory location is resolved, there is no such scheme defined in the url.

Second try. My mapping files reside next to my java domain models. Therefore I tried to just add all *.hbm.xml file which are located in my classpath:

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="dataSource" ref="myDataSource"/>
    <property name="mappingLocations">
       <value>classpath:**/*.hbm.xml</value> 
    </property>
</bean>

This may work if the bundle is completely build and wrapped in a jar. In my case I am trying to run this from within eclipse. What happens is that each mapping file is found twice. Once in the bin\ and once in the src\ folder which - for some reason - is in the search classpath which is used to add the files.

The only working solution that I found is the following:

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="dataSource" ref="myDataSource"/>
    <property name="mappingLocations">
       <value>osgibundle:/META-INF/hibernate/**/*.hbm.xml</value>
    </property>
</bean>

In which case I have to copy my mapping files into the respective /META-INF/hibernate folder.

I am just curious to know if somebody experienced similar behaviour? Am I missing something?

Regards,
Thorsten

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Re: Gemini Web with Hibernate [message #890625 is a reply to message #889444]

Fri, 22 June 2012 13:31

Mike Keith
Messages: 186
Registered: July 2009

Senior Member

Quote:

I am just curious to know if somebody experienced similar behaviour? Am I missing something?

Perhaps only the fact that Gemini has a JPA subproject for persistence Smile

You might want to give that a go and see if you find it easier.

-Mike

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Re: Gemini Web with Hibernate [message #890808 is a reply to message #890625]

Sat, 23 June 2012 01:02

Thorsten Schlathölter
Messages: 179
Registered: February 2012
Location: Düsseldorf

Senior Member

Thanks for the hint Mike. If I would go for a new project I would certainly give Gemini JPA a try. But my goal is to port an existing project to OSGI. The domain model consists of a couple of hundret objects which are all mapped with hibernate (not to mention all the Criteria and HQL-queries). To my knowledge Gemini JPA only provides integration with EclipseLink.

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Re: Gemini Web with Hibernate [message #892050 is a reply to message #890808]

Tue, 26 June 2012 21:04

Mike Keith
Messages: 186
Registered: July 2009

Senior Member

Gemini JPA uses EclipseLink as the JPA provider, but the main point is that the application does not need to assume any provider; it just needs to use standard JPA. Sounds like you are stuck with a legacy app that was written using proprietary API, though, so I guess you just have to make things work as best you can.

-Mike

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