Grails ClassCastException com.sun.proxy.$Proxy cannot be cast to org.springframework.orm.hibernate3.HibernateCallback

When launching a Grails app, you sometimes get a java.lang.ClassCastException: com.sun.proxy.$Proxy28 cannot be cast to org.springframework.orm.hibernate3.HibernateCallback

Just clear the .slcache directory.

On windows, that’s %userdir%\.grails\.slcache
On *x, it’s something along ~/.grails/2.0.4/.slcache/

Unfortunately, that happens up to several times a week. But if you just delete the folder, it’s fixed (until next time …).
The problem seems to occur more often when switching between different Grails apps in IntelliJ Idea.

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One Response to Grails ClassCastException com.sun.proxy.$Proxy cannot be cast to org.springframework.orm.hibernate3.HibernateCallback

  1. Chris Peacock says:

    This happens when running apps built with different Grails versions. There is an environment variable, GRAILS_AGENT_CACHE_DIR, that is supposed to set the location of .slcache which could be used to avoid these conflicts, but it’s not currently working for me.

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