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a blog, by Colin Pretorius

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AbstractMethodError and javassist. Woe.

Aw man. Why do these things have to get so complicated? I wanted to whip up a simple webapp using Hibernate. But when I fired up the app, I got:

Exception in thread "main" java.lang.AbstractMethodError: org.slf4j.impl.JDK14LoggerAdapter.trace(Ljava/lang/String;)V
	at org.hibernate.cfg.annotations.PropertyBinder.make(
... etc etc...

I found this discussion and a comment that it was an slf4j version mismatch with hibernate-annotations. So the solution is to explicitly include slf4j-log4j12 in your maven dependency list, before your hibernate-annotations dependency.

So with that sorted, I ran into the next problem:

Exception in thread "main" java.lang.NoClassDefFoundError: javassist/util/proxy/MethodFilter
	at org.hibernate.bytecode.javassist. BytecodeProviderImpl.getProxyFactoryFactory(
... etc etc...

To resolve that, you have to add javassist as an explicit Maven dependency.

That cost me the better part of tonight's tinkering time. Bah.

{2009.02.26 - 17:59}


1 Brett Colville (2009.03.05 - 20:27) #

Thanks - very few responses on Google for the slf4j problem. Your fix worked for me - I had a unit test that was passing in Eclipse but failing from Maven.
Now I might get out of here at a reasonable time!


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