 unable to get lazy loading to work [message #505774] |
Mon, 04 January 2010 21:37  |
 paul 
Messages: 4
Registered: January 2010 |
Junior Member |
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we are trying to get lazy loading to work, using this environment:
spring 2.5.6
eclipselink 2.0
maven 2.2.1
tomcat 5.5 (or tomcat6)
mysql 5.0.83
from one of the tutorials on eclipselink, we learned that dynamic weaving is not available in tomcat. ok. static weaving it is then.
we learned from this article ( http:// www.tzavellas.com/techblog/2008/10/17/statically-weaving-jpa -entities-for-eclipselink-using-maven/ ) how to statically weave our jpa entities.
when maven runs, it looks like static weaving is happening, for example, we see output like this:
[java] [EL Finest]: 2010-01-04 13:40:04.765--ServerSession(18378667)--Thread(Thread[main,5, main])--Begin weaver class transformer proce
ssing class [com/aftama/core/db/entity/Tenant].
[java] [EL Finest]: 2010-01-04 13:40:04.781--ServerSession(18378667)--Thread(Thread[main,5, main])--Weaved fetch groups (FetchGroupTrack
er) [com/aftama/core/db/entity/Tenant].
[java] [EL Finest]: 2010-01-04 13:40:04.781--ServerSession(18378667)--Thread(Thread[main,5, main])--End weaver class transformer process
ing class [com/aftama/core/db/entity/Tenant].
In the Tenant entity, shown in the above log output, we have one-to-many relationships defined like so:
@OneToMany(mappedBy = "tenant", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
private List<MediaCategory> mediaCategories = new ArrayList<MediaCategory>();
we have this line in our persistence.xml:
<property name="eclipselink.weaving" value="static" />
when we invoke a service call to fetch a Tenant (from a flex/blazeds UI to tomcat), it eagerly fetches the oneToMany collection, described above. we are expecting it not to fetch it, so that when we get the Tenant object back, the collection is null or empty.
we tried this in tomcat5 and tomcat6, with the same result: the oneToMany collection is fetched rather than not fetched.
what are we missing? how do we get lazy loading to work in this environment?
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| Re: unable to get lazy loading to work [message #505911 is a reply to message #505774] |
Tue, 05 January 2010 09:56  |
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Actually weaving is only required for lazy OneToOne/ManyToOne lazy will work in OneToMany without weaving.
So something in your model or application is most likely instantiating the relationship. Check that you are not accessing it. Also make sure you are not using a join fetch on it, if you don't want it instantiated.
James : Wiki : Book : Blog : Twitter
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