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 Post subject: hbm2java throws ClassCastException
PostPosted: Tue Jan 27, 2004 2:49 am 
Newbie

Joined: Sat Oct 18, 2003 10:44 am
Posts: 3
Location: Orange County, CA
When running hbm2java either by command line or from the Ant task, it throws a ClassCastException whenever I use any <meta> tags.

I have tried moving a single meta tag to the <hibernate-mapping> scope and inside <class> tags and always get the same error.

I'm using hibernate 2.1 and I tried the last release of the hibernate-tools and also built it from the HEAD tag.

Any help would be greatly appreciated. Hibernate works great for me but I can't force my team to use it without the <meta> tags working. I've worked on this problem on and off for a couple of months and just can't seem to get it resolved.


Here is the stack trace:
[hbm2java] java.lang.ClassCastException: java.util.ArrayList
[hbm2java] at net.sf.hibernate.tool.hbm2java.MetaAttributeHelper.mergeMetaMaps(MetaAttributeHelper.java:91)
[hbm2java] at net.sf.hibernate.tool.hbm2java.MetaAttributeHelper.loadAndMergeMetaMap(MetaAttributeHelper.java:112)
[hbm2java] at net.sf.hibernate.tool.hbm2java.ClassMapping.initWith(ClassMapping.java:162)
[hbm2java] at net.sf.hibernate.tool.hbm2java.ClassMapping.<init>(ClassMapping.java:76)
[hbm2java] at net.sf.hibernate.tool.hbm2java.CodeGenerator.handleClass(CodeGenerator.java:129)
[hbm2java] at net.sf.hibernate.tool.hbm2java.CodeGenerator.main(CodeGenerator.java:104)
<snip>


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 Post subject:
PostPosted: Thu Feb 05, 2004 5:02 pm 
Regular
Regular

Joined: Wed Dec 31, 2003 4:26 am
Posts: 108
Location: Berkeley, CA
Hmmm. The first thing that pops into mind is that you are specifying a java.util.ArrayList. This is perhaps for some association?? Well, Hibernate requires that you not use actual Collection classes but only Collection interfaces: e.g., List, not ArrayList, so that Hibernate can then sneakily substitute its own implementations. Those implementations are essential to the dynamic resolution of relationships: e.g., lazy loading. So, off the cuff, that's the first change I'd make.

Second, post more of the mapping file. This error looks familiar but the mapping will give better insight.


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 Post subject:
PostPosted: Thu Feb 05, 2004 5:58 pm 
Hibernate Team
Hibernate Team

Joined: Tue Aug 26, 2003 6:10 am
Posts: 8615
Location: Neuchatel, Switzerland (Danish)
this looks like a waay old bug ;)

are you sure you are using the latest ?

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