Object is not an 'instanceof' it's own class

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I'm trying to hunt down some issues with spring not expending a factoryBean. I've plugged into a debugger and proven that the failure is in this line of AbstraceBeanFactory:

if(!beanInstance instanceof FactoryBean) || BeanFactoryUtils.isFactoryDereference(name)) {
   return beanInstance;
}

specifically the "beanInstance instanceof FactoryBean" part is returning false when it should be true, resulting in my returning a factorybean back rather then the bean that the factory is suppose to construct.

My debugger clearly tells me that the the beanInstance is a org.springframework.beans.factory.config.PropertiesFactoryBean. When I tell eclipse to expand the class of bean I see it clearly implements FactoryBean

For further testing I went to expressions. Supposedly the expression:

beanInstance instanceof org.springframework.beans.factory.config.PropertiesFactoryBean

returns false. However beanInstance.getClass() returns

(org.springframework.beans.factory.config.PropertiesFactoryBean) (id=112)

It seems my VM is very confused about this class. I'm trying to figure out what would cause this confusion, and how I can fix it?

The most likely case seems to be confusion across multiple class loaders, but I haven't found any obvious examples. There should only be one implementation of PropertiesFactoryBean in my classpath.

What would cause instanceof to fail in this manner? How can I hunt down my root cause?

Incidentally, this is ultimately a tomcat instance I'm debugging, if it's relevant. Also, beanInstance is an instanceof Object, so intanceof does work properly sometimes.

ps. I had to type this by hand rather then copy/paste. Please assume any obvious naming mistakes are typos on my part.

asked 43 secs ago

dsollen

679

Object is not an 'instanceof' it's own class